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Man says CES lidar’s laser was so powerful it wrecked his camera
- ddebernardy 8y ago1550nm anti-paparazzi devices coming in 3... 2... 1... (Or maybe not, owing to the potential liability.)
- Reason077 8y agoIf we are to have streets full of Lidar-equipped vehicles all constantly blasting out laser light, I can imagine this will become a real problem. Will digital cameras improve so that they are less sensitive to lasers? Or will Lidar improve to use less-powerful lasers?
- BuildTheRobots 8y agoIf it can do that to a camera, what's it doing to eyes? edit: > "Cameras are up to 1000x more sensitive to lasers than eyeballs," Dussan wrote. "Occasionally, this can cause thermal damage to a camera's focal plane array." - I'm still not entirely sold.
- jpalomaki 8y agoFrom the article "Cameras are up to 1000x more sensitive to lasers than eyeballs," Dussan wrote. "Occasionally, this can cause thermal damage to a camera's focal plane array." Another site claims "However, there are no MPEs for sensors such as CMOS or CCD chips. This means a show may be perfectly safe for eyes, but could possibly damage a camera sensor. One reason is that camera lenses may gather more laser light, and concentrate it to a finer point. Another reason is that CMOS or CCD sensors are more easily damaged than the eye."[1] [1] http://www.laserpointersafety.com/ilda-camera-info.html http://www.laserpointersafety.com/ilda-camera-info.html
- BuildTheRobots 8y agoI'd love to see some independent results from someone who doesn't have skin in the game. Whilst damage might be more obvious in a camera CCD, even small amounts of cumulative damage over time could be doing serious harm without it being immediately obvious. I've seen f/1.6 lenses, where as the eyes are apparently f/8.3 - f/2.2, so yes the eyes take in less light, but it's substantially harder than an EF-S mount to swapout. edit: also, what about animals with good night vision? they are more sensitive and take in more light - are they at danger?
- ddebernardy 8y agoThe article actually has the answer: > Other lidar makers use lasers with a wavelength of 1550nm. This tends to be more expensive because sensors have to be made out of exotic materials like indium-gallium arsenide rather than silicon. But it also has a big advantage: the fluid in the human eye is opaque to 1550nm light, so the light can't reach the retina at the back of the eye. This means lasers can operate at much higher power levels without posing an eye safety risk.
- BuildTheRobots 8y ago> the fluid in the human eye is opaque to 1550nm light sure, but does this hold true for most land-based animals and birds? How much range does this give us? reflections can shift by half a wavelength - is that still opaque too? I'm not saying this isn't safe, but suddenly having a tonne of high power laser sources pointing everywhere at all times might actually have some consequences still...
- csours 8y agoMammals, lizards, amphibians, and birds all have water-based eyes, but I wonder what this would do to insects.
- jerf 8y agoIf I am reading the chart labelled "The visible and UV spectra of liquid water" at http://www1.lsbu.ac.uk/water/water_vibrational_spectrum.html http://www1.lsbu.ac.uk/water/water_vibrational_spectrum.html (about 2/3rds down the page) correctly, water is fairly opaque at 1550nm. If my hurried wikipedia education on the topic is correct, that chart is saying it's quite opaque at that frequency, even at bat eyeball scales. Corrections welcomed from people with more training in this field. (I'm not sure I'm not getting some crossed units when I tried to resolve that into numbers normals like me would understand; is that really 1/e^1000 transmitted per centimeter travelled? e^1000 is a big number. There's even bigger ones on that chart. Then again, if a two-atom-thick layer of gold is enough to make something look like gold and completely obscure what's underneath, I guess that might make sense and my intuition is just off, because when I convert that into this sort of scheme I get big numbers there, too.)
- apendleton 8y agoThey address in the article that the frequency they're using can't damage the retina because the fluid in the eye is opaque to light at this frequency.
- icelancer 8y agoA camera is not the human eye. Just because they are both technically optical sensors does not mean they are equivalent really at all.
- dllu 8y agoMost current self driving car lidars operate close to the 900 nm range, and they are required to output 1000 times less power than the 1550 nm lidar in this article. [1] So far these seem totally harmless to cameras. 1550 nm lidars for self driving cars are a relatively recent thing with only a handful of companies (AEye, Luminar, Blackmore) making them. The benefit is that, thanks to the extra power, they have longer range. Unfortunately they fry cameras and are very expensive. It's also worth pointing out that the 1550 nm pulsed lidars like AEye and Luminar with fiber lasers may have much shorter pulses than the 5 ns pulses of, say, a 905 nm Velodyne lidar. So, not only is the average power 1000 times higher, but the peak power may be even higher. [1] https://en.wikipedia.org/wiki/File:IEC60825_MPE_J_nm.png https://en.wikipedia.org/wiki/File:IEC60825_MPE_J_nm.png
- robocat 8y agoThe relevant part of the article: "But it also has a big advantage: the fluid in the human eye is opaque to 1550nm light, so the light can't reach the retina at the back of the eye. This means lasers can operate at much higher power levels without posing an eye safety risk. AEye uses 1550nm lasers. And unfortunately for Chowdhury, cameras are not filled with fluid like human eyes are. That means that high-power 1550nm lasers can easily cause damage to camera sensors even if they don't pose a threat to human eyes."
- m3kw9 8y agoI imagine it is doing something to the fluid in the eye with that kind of energy it absorbs. Maybe cataracts for example.
- iClaudiusX 8y agoExactly, it's the same with unshielded microwaves, and it's astonishing that someone would think it's safe to crank the power on these lasers with that justification. > When injury from exposure to microwaves occurs, it usually results from dielectric heating induced in the body. Exposure to microwave radiation can produce cataracts by this mechanism,[28] because the microwave heating denatures proteins in the crystalline lens of the eye (in the same way that heat turns egg whites white and opaque). The lens and cornea of the eye are especially vulnerable because they contain no blood vessels that can carry away heat. https://en.wikipedia.org/wiki/Microwave#Effects_on_health https://en.wikipedia.org/wiki/Microwave#Effects_on_health
- gene-h 8y agoFortunately, the military industrial complex has the solution to this. For some time now, there have been worries over lasers being used to blind sensors and people so a number of approaches have been developed to defend against this. Lasers only emit at a set of limited wavelengths so one can block out just these wavelengths. Another more exotic approach is to block the light coming in as soon as the laser has been detected. LCDs are an obvious solution to this, though I have seen microshutter arrays proposed for this in a Popular Science/Mechanics magazine a while back. Although, it's probably better to prevent LIDAR from destroying cameras in the first place.
- dogma1138 8y agoI’m pretty sure you mean the defense industry, the military industrial complex isn’t the defense industry, it doesn’t make anything ;) And the solution is far more simpler than you think the domes for the sensor packages are simply better rated, as they are rated for true 99.999% absorption for both UV and IR (beyond FLIR ranges) some of them also have an inner layer that would darken if the light penetrates that deep creating a dark spot that would block the light completely since replacing a dome is cheaper than replacing a cryogenic IR sensor array. But beyond that you can blind the sensors with most pen lasers as well as damage it with visible light, the reason why it’s not much of an issue is that due to simple physics you won’t be able to focus a beam narrow enough to hit the sensor even atmospheric refraction alone would prevent that from happening and any laser capable of damaging the sensor at the point would likely be able to damage the drone. The IR dome protection was mostly implemented to protect the sensor if the drone is painted with an illuminated.
- SEJeff 8y agoAnother option is that machine vision will improve to the point where Lidars are less of a necessity. This is in fact the thing Tesla is attempting to do, although they are far from pulling it off!
- computerex 8y ago> Another option is that machine vision will improve to the point where Lidars are less of a necessity. Highly doubt this will happen anytime soon. Machine vision has come a long way past decade but nonetheless it is far from being reliable for driving. I think lidar is pretty much a necessity for safety's sakes.
- SEJeff 8y agoIt is all relative (safety that is). If you’re driving on a new road that hasn’t been mapped with the super high res Lidar, it presents a problem. Machine vision absolutely is the holy grail here. Not you or anyone else can say either machine vision OR lidar are necessary as neither of them currently power a self driving car. There isn’t currently such a thing that can do say a cross country road trip on any highways. Not even Waymo.
- computerex 8y ago>If you’re driving on a new road that hasn’t been mapped with the super high res Lidar, it presents a problem. Not even remotely true. LIDAR is used to SLAM in real-time. Think of it as a radar on steroid. For successful reliable autonomous driving you need both machine vision and lidar. If you only use machine vision, you end up like Teslas and slam into stationary fire trucks. So you use machine vision for reading signs, lane localization, etc and lidar to prevent accidents. > a cross country road trip on any highways. That's not the agreed upon definition of self driving. Also, you should probably take a look at this: https://en.wikipedia.org/wiki/Self-driving_car#Testing https://en.wikipedia.org/wiki/Self-driving_car#Testing Waymo on average travels for 5,127.9 miles before a human disengagement is necessary measured over 635,868 miles. Cruise, 5,224 miles. Tesla, 2.9 miles. > Not you or anyone else can say either machine vision OR lidar are necessary Well since pretty much every single company that exists right now in the autonomous car space with the exception of Tesla uses LIDAR, I am inclined to think that's the way to do it. All in all, machine vision is way too unreliable for anything above SAE level 2. Due to the nature of machine learning algorithms used (CNN) you can't be sure that a firetruck will always be recognized as a firetruck. The only way to reliably "see" a firetruck is via lidar/radar.
- pducks32 8y agoCertainly birds might not adapt to be less sensitive. I certainly would hope that research will be done to check how the type of EM pollution will affect nature. It might not but it also might over time.
- segfaultbuserr 8y ago> Crucially, self-driving cars also rely on conventional cameras. So if those lidars are not camera-safe, it won't just create a headache for people snapping pictures with handheld cameras. Lidar sensors could also damage the cameras on other self-driving cars.
- pishpash 8y agoSeems like something the FCC should regulate. It's the radio spectrum.
- gorkish 8y agoFCC regulates only to 3THz (~100µm wavelength). The IR laser emission is near 200THz. Regulatory jurisdiction here is the FDA under 21 CFR 1040. Unfortunately MPE for the regulation is all based on the biology of the eye, so that is where you'd have to find your argument. Probably the best avenue to argue would be that the peak power of the short pulse is above MPE although in a practical sense the total energy may not be a problem. My guess is that in this case there would be allowable measurement methodology that both passes and fails the standard, and the legal argument would center around that.
- stefan_ 8y agoThat sounds fantastic, can we put this into something I can wear?
- AWildC182 8y agoDepends on the infrared band they're using but normal glass or acrylic should stop most of it. Edit: looks like they're using SWIR (~1500nm) so glass/acrylic/polycarbonate will pass it just fine.
- cronix 8y agoWe're thinking along the same lines. I was wondering how this could be adapted to just make you invisible to cameras. It would be a fun project to deploy at a protest or something where everybody is filming everyone else, or maybe I just don't want to be caught on 500 building cameras as I walk down the street.
- bhousel 8y agoCool. This will be fine as long as 2 self driving cars never go near each other.
- qznc 8y agoShouldn't this also be a problem with other non-passive sensors like radar. If we have a traffic jam of cars each sending radio waves from multiple sensors there has to be quite some interference, no?
- dllu 8y agoRadars pointed at each other may have some interference resulting in temporary erroneous readings but they won't be permanently damaged like the camera in the article.
- aidenn0 8y agoIn a heterogenous environment this is not necessarily true; a radar with a powerful transmitter could damage a radar with a very sensitive receiver, particularly at close ranges. There are military jamming devices that can quite handily permanently damage radars not designed to distinguish it.
- dllu 8y agoOh I see, that makes sense. I wonder if any automotive radars are that powerful.
- aidenn0 8y agoAlmost certainly not. The FCC approval process would likely catch that. Lasers are also far more focused then microwaves (typical spot size of a cheapo laser pointer is 12cm at 100m away; police LIDAR is good to target a single car out to at least 1/4 mile).
- dingaling 8y ago
- Latteland 8y agoJust imagine in a few years there will be thousands of devices using lidar in a city. Will that be enough to knock out endless surveillance cameras?
- peterlk 8y agoYep, by the same companies that will bring you _Surveillance Lidar_!
- dllu 8y agoSurveillance lidar is a thing. [1] Quanergy Perimeter Security System https://www.youtube.com/watch?v=IFCgEzdrbQM https://www.youtube.com/watch?v=IFCgEzdrbQM [2] Quanergy's LiDAR-based security solution https://www.youtube.com/watch?v=PpYDWb2yX_M https://www.youtube.com/watch?v=PpYDWb2yX_M
- RandomInteger4 8y agoWe can call it "Sidar"; play on the word cider, and the logo for the company or brand would be a jar of cider with an eye floating in it.
- shittyadmin 8y agoWonder if you could knock out speed cameras and red light cameras with this in a way which wouldn't be noticed. Good to know they claim you can do it with a laser that's not dangerous to the human eye.
- boxcardavin 8y agoI tweeted at him to ask him what size lens and sensor he has so I could estimate how much energy/flux was hitting his sensor. Anyone have an idea of how many lidar it would take to saturate an area and make distance measurements useless? It's tougher with lidar because you can't easily frequency shift like with radar.
- asdfasgasdgasdg 8y agoIf it's a $2000 Sony camera, it's definitely going to be a 35mm sensor. His lens on the other hand I wouldn't be able to guess.
- dllu 8y agoIt's a Sony ILCE-7RM2 with a 35mm lens at f/4: https://twitter.com/jitrc/status/1083190800710684673 https://twitter.com/jitrc/status/1083190800710684673
- asdfasgasdgasdg 8y agoI'm puzzled by the fact that it's only burned in two spots. This is a mirrorless camera so the lidar would be going into the lens and hitting the sensor constantly, not just during the exposure. I wonder what's happened here.
- quickben 8y agoSomebody mentioned it's a pulsing one.
- ajkjk 8y agoInteresting. I also remember hearing about a device which zap mosquitos out of the air with lasers and a lot of careful accuracy. Is the future going to include nefarious actors with devices which near-instantly destroy all cameras (...or eyes?) in sight?
- emeraldd 8y agoSo some has already built an "Eye Seeking Laser" https://www.youtube.com/watch?v=Q8zC3-ZQFJI https://www.youtube.com/watch?v=Q8zC3-ZQFJI
- Symmetry 8y agoYou want to build your mosquito-zapping lasers to use a frequency that won't go through your eye to hit your retina.
- zo1 8y agoI saw it in a Ted talk: https://www.ted.com/talks/nathan_myhrvold_could_this_laser_zap_malaria?language=en https://www.ted.com/talks/nathan_myhrvold_could_this_laser_z...
- Neil44 8y agoBack in the day I did this to an old CyberShot with a laser pointer, it permenantly had two purplish marks on the images afterwards. I would think the laser would need to be somewhat static or slow moving to cause the damage though not scanning at high speed. You can see the purplish marks just slightly down and left of centre here - https://i.ibb.co/THMS42D/dsc00006.jpg https://i.ibb.co/THMS42D/dsc00006.jpg
- joshvm 8y agoThis is actually how several LIDAR scanning stations are allowed to be called class I (or maybe II) devices. The lasers inside would do bad things to your eyes (easily class 3). Because they're pulsed and spinning, the odds of you getting multiple hits to your eyeballs are quite low.
- deleted 8y ago[deleted]
- arriu 8y agoIs there any research material to support these claims? I can't imagine the energy and optics involved would have been sufficient to do this. Seems like coincidence to me. The sun has far more energy than what we're talking about here. I'm happy to be proven wrong though as I wouldn't want something unsafe on the streets as much as anyone else.
- sjburt 8y ago> In an email to Ars Technica, AEye CEO Luis Dussan confirmed that AEye's lidars can cause damage to camera sensors—though he stressed that they pose no danger to human eyes. So, yes.
- Retric 8y agoTaking a picture of the sun will destroy most cameras. So, I don’t think that supports your argument.
- umvi 8y agoEven with really quick exposures? I've taken pictures of the sun before (before, during, and after last year's eclipse) with my cell phone camera and it seemed fine.
- mrexroad 8y agoEdit: added link [0] to lensrentals.com story about gear damaged during solar eclipse of 2017. Your cell phone camera has a wide angle lens. it's at the longer focal lengths where one might expect sensor damage, or even melt the curtains of shooting directly into the sun when high above horizon. [0] https://www.lensrentals.com/blog/2017/09/rental-camera-gear-destroyed-by-the-solar-eclipse-of-2017/ https://www.lensrentals.com/blog/2017/09/rental-camera-gear-...
- packetized 8y agoYour cellphone camera lens likely doesn’t have the requisite light-gathering capacity to burn out the CMOS image sensor in your phone. CCDs (commonly used in DSLR/M43 cameras) are far more sensitive, as I understand it.
- HyperTalk2 8y agoI don't recall ever being asked whether I consent to sharing the road with non-human drivers. I don't, and I doubt most sane people outside of this echo chamber of tech hype insanity do either. (Cue someone totally owning me with a bulletproof whataboutism about horse carriages.) I don't see why we need self-driving cars at all. I'd rather share the road exclusively with other humans that fear death just as much as I do. Are we doing this just for the novelty of it? Just because we can? By following that philosophy, now the entire console in every new car has been replaced with a laggy touch screen with zero haptic feedback that you need to stare at while driving and risk death every time you use. And now we get to look forward to lasers everywhere causing insidious cumulative damage to random people's electronics and perhaps even leading to gradual blindness for drivers and pedestrians alike just to enable yet another feature no sane person ever asked for. (Cue some super cereal pinky promise about how "studies show" these lasers are harmless to humans. Before long, I expect to see fake news about how firing focused energy weapons directly into your eyes all day long is actually healthy somehow.) All of this needs to be stopped by any means necessary.
- goda90 8y ago"I'd rather share the road exclusively with other humans that fear death just as much as I do." Assuming you fear death enough to give your full attention to driving safely, how do you hope to accomplish this wonderful utopia? There will always be drunk, distracted, aggressive, tired, epileptic, vision impaired drivers as long as humans are driving. The true solution is to remove all human drivers and only have computers that don't need to worry about unpredictability of other cars, because the cars communicate directly.
- HyperTalk2 8y agoYou are comfortable with a world where people are forced to randomly die from buggy code. You are comfortable with a world where a worm utilizing a remote code execution exploit activates the hidden payload on a set date and steers infected cars in random directions and kills tens of millions of people in 24 hours. You are comfortable with a world where car manufacturers can provide a simple API for government agencies or the highest bidder to enter a desired target's name and remotely hijack and pilot their car into a tree at 90 mph and their family members are mocked as conspiracy theorists for suggesting anything is amiss. I am not comfortable with a world where someone like you has the power to implement their insane ideas.
- deleted 8y ago[deleted]
- milleramp 8y agoSilicon is transparent above 1.1um this laser is at 1.5um, so perhaps the infrared cut filter that sits above the sensor was damaged. Perhaps Sony is using a absorptive IR filter and it was damaged by heat, if it was reflective filter i doubt it could be damaged.
- dllu 8y agoSome shortpass filters only block 700 nm to 1100 nm and are not rated for performance above 1100 nm, since the silicon sensor cannot "see" light above 1000 nm anyway (but may be damaged by sufficiently strong amounts of it). So, perhaps Sony was using an IR block filter that blocks near IR from 700 nm to 1000 nm but doesn't block 1550 nm perfectly.
- milleramp 8y agoYes this that is probably the case, no need to block beyond 1.1um for images, perhaps now they should extend it for safety. The laser must have passed through and damaged the metal interconnects on the backside of the sensor.
- deepnotderp 8y agoIt's probably thermal damage
- kevitivity 8y agoVisible laser light kills cameras all the time. I think this is more likely what happened here. https://photofocus.com/2013/09/14/beware-lasers-can-kill-your-cameras-sensor/ https://photofocus.com/2013/09/14/beware-lasers-can-kill-you...
- jcims 8y agoIndeed. Lots of evidence on YouTube https://www.youtube.com/results?search_query=laser+sensor+kill https://www.youtube.com/results?search_query=laser+sensor+ki...
- wlesieutre 8y agoThat he took a photo of a visible light laser and it wasn't the car's IR laser? Or just that lasers in general are known to do this and the car's laser probably did it?
- petermcneeley 8y agoI hate giving Elon credit, but there is some wisdom in the idea of only using optical Receivers for self driving input.
- gamblor956 8y agoCar LIDARs do/would operate at a different frequency and power level than the LIDAR at issue here, so no.
- tom_ 8y agoPeople that hate giving Musk credit don't, in general, call him by his first name.
- dgzl 8y ago> I hate giving Elon credit Why? Not only is he a genius (citation needed), but he's also highly invested in big-risk companies working toward a healthy future. I wish more people were like Elon.
- totallynotcool 8y agoWith lidar becoming more and more popular, are there ways to protect cameras in it's path; i.e. dashcams.
- ChuckMcM 8y agoLaser camera damage is a known thing. That Aeye would buy him a new camera was pretty cool. Not sure how scalable that is as people take broken cameras that can still get damaged, find an AEye car, and then set up a replacement. If you went to a Diwali laser show you would get the ultimate camera death mix, fine powder and lasers :-).
- computerex 8y ago> That Aeye would buy him a new camera was pretty cool. I wonder if they had warning signs telling people about the active lasers and possible camera damage. If they didn't, I feel like replacing the camera is just the right thing to do. It was CES, people are bound to have cameras.
- dylan604 8y agoIf the wavelength of the laser is a known 1550nm, maybe the companies like Lee, Tiffen, etc can come out with a filter to protect against this. Street photographers will be susceptible to driverless cars without warning. It would be a niche market for sure, but if I was doing street work where it was known to have driverless cars, it would be worth ~$100 filter to protect my >$2500 camera body.
- dgzl 8y agoFor the short term, sure. But long term, the lidar system will have to be adjusted to not cause harm to the public.
- deleted 8y ago[deleted]
- 01100011 8y agoIs LIDAR just a stop-gap solution until we get better structure-from-motion type algorithms? Humans don't need lasers to drive. Binocular vision seems to suit the task just fine. Autonomous vehicles have the advantage that they can leverage hyperspectral imaging. Why the obsession with LIDAR?
- rjeli 8y agoWriting software for competent self driving is turning out to be really hard, and no one is succeeding. On the other hand, building better and cheaper lidar hardware is a well-defined problem that companies can pour money into. Their software still sucks, but everyone’s occupied with wrangling the $100k lidar.
- grenadier21 8y agoCould some rebel make things like fake road bumps that lidars can't pick up, but humans can?
- 01100011 8y agoProtecting AI against spoofing attacks is a pretty active area of research right now.
- paradoxparalax 8y agoProtecting neural networks from adversarial attacks, i think you mean. Protecting good A.I. from spoofing attacks is exactly the same as protecting human drivers from spoofing attacks.
- brokenmachine 8y agoOr the other way around - trick the lidar into thinking a road bump is there when there is no bump.
- lsc 8y agoI agree... but I also want to point out that it's totally possible that writing software to make self-driving cars work acceptably well might be easier if the software has better sensors than a human does, so it might actually be the best way to try to solve the problem.
- sbr464 8y agoIt sucks that UX issues (for lack of a better term) like this exist. It’s one of the sole reasons we don’t have the Concorde flight program any longer, since it couldn’t do any domestic flights because of the noise pollution from breaking the sound barrier etc. Joking aside, it’s interesting how these issues have to be considered when innovating at the bleeding edge.
- sbr464 8y agoIn comparison, if you consider CES as a modern day world’s fair, imagine the dangers of experiencing a Tesla electricity exhibit or some of the earlier X-ray tech with hour long exposure to high radiation. https://abcnews.go.com/beta-story-container/Health/Wellness/century-ray-machine-shows-radiation-risks-yore/story?id=13140857 https://abcnews.go.com/beta-story-container/Health/Wellness/...
- walrus01 8y agoI strongly dispute the claim that 1550nm is eye safe. 1550nm is also the band used for long distance, high powered DWDM transport systems for internet backbone purposes. And is common in "long reach" SFP+ modules for use 80 to 120km on dark fiber without amplification. There are common eye safety precautions, one of which is you NEVER aim the ferrule from a optic or patch cable at your face with a live 1550nm signal on it. This is known by everyone who lights long distance dark fiber. This company claims they have a 1550 band laser operating in free space air, spraying all over the place, with a 1000 meter range? Oh, great. It's not in the visible spectrum so you can't tell if it's damaging your eyeballs, either.
- paradoxparalax 8y agoI hope AI evolves fast enough to kill LIDAR even before it's birth. I really hate lasers on my eyes. I have fought once with some street laser sellers because of it, and some blood was splat. I don't like fighting and I'm not violent at all, but I hate those things and a future of thousands lasers coming from all cars on the street would be the Horror. Luckily it's all most vaporware and carmakers are going to loose a few billion dollars on this mistake, before pivoting to raw pixel based A.I.
- paradoxparalax 8y agoIf I had to bet my money, I would bet LIDAR will be like Betamax home videoplayers. Or the Sony Discman. Will die rather young : D , thanks god.
- rblatz 8y agoSo vitreous fluid is opaque to 1550nm light and will block these new powerful lasers from damaging the retina. What about people that have recently had retinal detachment surgery, and had the vitreous fluid replaced with an oil, is this replacement oil also opaque to 1550nm?
- walterbell 8y agoLaser vendor: can we sell laser-blocking AR glasses to monetize our electromagnetic pollution? Smith: these are safety glasses, not a facial-recognition firewall.
- navs 8y agoSo when a company says that it’s safe does this include testing for all of these cases? While I haven’t had retinal detachment surgery, I’ve had lasik done. I’m sure, being a common procedure, that it’s considered in whatever battery of tests are performed. But what of these other procedures? I’d hate to be walking down the street and suddenly be affected because my eyes are just “different” https://youtu.be/zkD9SBP9AX4 https://youtu.be/zkD9SBP9AX4
- yogrish 8y ago“Lidar sensors could also damage the cameras on other self-driving cars.“ so eventaulally driverless Cars spoil each other camera sensors and can’t recognize pedestrians, traffic signs. How can cameras be immune to high power laser beams?
- fest 8y agoBy using low-pass optical filters on cameras, for example like this one (probably much cheaper in volume): https://www.edmundoptics.com/document/download/396359 https://www.edmundoptics.com/document/download/396359 I've used band-pass filters which reject everything except a narrow band, so that camera sees just the IR LED (chosen to fall in the middle of passed band) and they cost a few USD in small volumes.