4 ms·

Also airplanes, satellites etc. The standard now is laser ring gyroscopes as they have no moving parts, are super sensitive, and very light in comparison to old

by leeter 5y ago

Also airplanes, satellites etc. The standard now is laser ring gyroscopes as they have no moving parts, are super sensitive, and very light in comparison to older options. Mentour pilot has an episode on how these are used in the 737. https://en.wikipedia.org/wiki/Ring_laser_gyroscope https://en.wikipedia.org/wiki/Ring_laser_gyroscope

jjoonathan 5y ago
Speaking of which, these seem like the kind of thing that would integrate well, but cell phones are still stuck with gyros/accelerometers/magnetometers that are pretty bad, especially in cities, double especially near buried power lines. The old "my heading spins rapidly in circles whenever I walk on a certain section of sidewalk" problem. Are there engineering challenges to integration or is it a spooky controlled technology conspiracy?
- leeter 5y ago
  IIRC it's a size and power thing. You can emulate most of what a ring laser gyro does with good accelerometers and that's the better choice for most devices needing long battery life and compact size. Ring laser gyros (while small) are not that small last I checked. A quick google shows you can get them in about the size of a pocket watch. So potentially a good case addon for those that need it without the cost/power usage issues that would hit those that don't.
  - jjoonathan 5y ago
    By "integration" I meant "turn the module into a chip" rather than "put the module in a phone" -- though your point about power could be the answer. Some lasers and optics just feel like the kind of thing that a clever team could squeeze onto a wafer, maybe with a loop in the third dimension. Or maybe just require two of them. There's probably a good answer as to why that's harder than it seems, I just don't know what it is.
    - leeter 5y ago
      It looks like there is work in that direction... but like most things it's 10years (TM) away. https://www.nature.com/articles/s41566-018-0266-5 https://www.nature.com/articles/s41566-018-0266-5 https://arstechnica.com/science/2018/11/tiny-laser-gyroscopes-awesome-though-still-need-work/ https://arstechnica.com/science/2018/11/tiny-laser-gyroscope...
      - jjoonathan 5y ago
        Cool, thanks for the links!
nayuki 5y ago
Specifically, Mentour Pilot talks about inertial navigation systems in https://www.youtube.com/watch?v=J89uROO8Gsc https://www.youtube.com/watch?v=J89uROO8Gsc

by leeter 5y ago

jjoonathan 5y ago

Speaking of which, these seem like the kind of thing that would integrate well, but cell phones are still stuck with gyros/accelerometers/magnetometers that are pretty bad, especially in cities, double especially near buried power lines. The old "my heading spins rapidly in circles whenever I walk on a certain section of sidewalk" problem. Are there engineering challenges to integration or is it a spooky controlled technology conspiracy?

leeter 5y ago
IIRC it's a size and power thing. You can emulate most of what a ring laser gyro does with good accelerometers and that's the better choice for most devices needing long battery life and compact size. Ring laser gyros (while small) are not that small last I checked. A quick google shows you can get them in about the size of a pocket watch. So potentially a good case addon for those that need it without the cost/power usage issues that would hit those that don't.
- jjoonathan 5y ago
  By "integration" I meant "turn the module into a chip" rather than "put the module in a phone" -- though your point about power could be the answer. Some lasers and optics just feel like the kind of thing that a clever team could squeeze onto a wafer, maybe with a loop in the third dimension. Or maybe just require two of them. There's probably a good answer as to why that's harder than it seems, I just don't know what it is.
  - leeter 5y ago
    It looks like there is work in that direction... but like most things it's 10years (TM) away. https://www.nature.com/articles/s41566-018-0266-5 https://www.nature.com/articles/s41566-018-0266-5 https://arstechnica.com/science/2018/11/tiny-laser-gyroscopes-awesome-though-still-need-work/ https://arstechnica.com/science/2018/11/tiny-laser-gyroscope...
    - jjoonathan 5y ago
      Cool, thanks for the links!

nayuki 5y ago

Specifically, Mentour Pilot talks about inertial navigation systems in https://www.youtube.com/watch?v=J89uROO8Gsc https://www.youtube.com/watch?v=J89uROO8Gsc