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>I know you're having trouble due to the costs associated with low volume, but to an ordinary purchaser your price looks like a rip-off. Yup, being a hardware
by joshvm 8y ago
>I know you're having trouble due to the costs associated with low volume, but to an ordinary purchaser your price looks like a rip-off.
Yup, being a hardware engineer makes you appreciate just how cheap some things are. Bear in mind that our motivation to develop our instrument was shock at how much the incumbents were charging! I think getting to O($500) for a quality instrument without high volume would be fairly doable with some clever design work. Getting to O($100) yes, if you could make the entire optical bench as a MEMS product and you have scale on your side (this has been done partially by SCiO).
A big limiting factor is that there aren't many perceived use-cases beyond "science". The big consumer one that everyone touts is food inspection, but outside a few very specific uses, it's a gimmick to most people. Maybe for avocado ripeness... It's also not ready for primetime yet. The real markets are places like astronomy where people don't hesitate spending thousands on glass and silicon. Brewing is another. You want hobbies which are taken up by data nerds.
The other problem is that spectrometers are overkill for a lot of stuff. Colour measurement for instance - (calibrated) colorimiter ICs are incredibly cheap. For applications where you need the resolution you either need an experienced user or software to automatically interpret the results.
There are some other off the shelf solutions: Hamamatsu make a low resolution spectrometer that's good enough for general demonstration - costs a few hundred[1]. AMS make an 18-channel "spectral" sensor which costs $10 (ish?). There have been a few Kickstarters which are trying to address this e.g. the SCiO [2]. That's about the closest we've got so far to a mass market spectrometer and it costs $299.
The problem as you say is: how many schools can afford even $100 on a device which may only get used once or twice a year? Holding a transmission grating up to your eye will solve maybe 90% of the needs of most teachers. It's enough to show different line emission from a bunch of lamps. The public labs spectrometer would do for the other %10.
[1]https://www.consumerphysics.com/scio-for-consumers/ https://www.consumerphysics.com/scio-for-consumers/
[2]https://groupgets.com/manufacturers/hamamatsu-photonics/products/c12880ma-micro-spectrometer https://groupgets.com/manufacturers/hamamatsu-photonics/prod...
- burfog 8y agoI don't think MEMS is required. For $60 you can get a 2 TB hard drive. It contains platters that are several inches in diameter, and there is a swinging arm that is a couple inches long. All these parts move with incredibly tight tolerances. DVD writers are $26, and Blu-Ray writers are $120. Those are an even better comparison, with moving optics. Food inspection is silly unless that is your job. People who keep aquariums, particularly saltwater ones, are a more likely market. 18 channels sounds great for most school labs. It's enough for a crude graph of chlorophyll's absorption and/or florescence. It might even be enough to distinctly identify the four main sources of color in spinach leaves. Repeated sampling at about 10 Hz would be plenty for all the labs involving reaction rates; most could be done with 0.1 Hz. For example, a popular lab involves measuring the changing rate at which Crystal Violet is destroyed by lye. Some less-demanding popular labs involve measuring the amount of copper in brass (as copper nitrate via nitric acid) or the molarity of blue food coloring in drinks.
- joshvm 8y agoDo you fancy chatting further about this? I've been toying with writing a hacker's guide to spectroscopy, and it would be interesting to know what sort of experiments schools would find useful. Feel free to get in touch at josh at iayc dot org. > Food inspection is silly unless that is your job. Nevertheless, that's what the majority of the consumer devices are going for. Ripeness detection, "quality" measurements (eg measuring brix) and so on. SCiO also mention things like pill identification and body fat measurements. This is the problem: these are all gimmicky things that get VC funding but aren't all that useful in the real world. This is the AMS sensor btw https://www.digikey.co.uk/product-detail/en/ams/AS72651-BLGT/AS72651-BLGTCT-ND/9486614 https://www.digikey.co.uk/product-detail/en/ams/AS72651-BLGT...