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June 23, 2012
Head evangelist for PulsedLight, creators of LIDAR-Lite
about 6 years ago
Great answer! One correction, however. The signal processing we use, would not be affected by the laser pointer beam at all. In fact, you could point multiple LIDAR-Lites at the same target and they would not interfere with each other!
The beam is a 1/2 degree, so, without doing a lot of math, at 10m it's about the size of a softball, 20m would be about a basketball in size and at 40m it's about .5m square.
It depends on a couple of factors. The 905nm source that's used in the sensor will penetrate into the water if it is clear and still. In shallow water, under 1m, it may actually read to the bottom. If the water is murky and turbulent you will have a better chance of reading the surface from directly above. You can also measure the surface from an angle, up to about 45 degrees, and get readings.
Well I owe you a double thanks!
You need to join the support forum group on our site. There's a group that are working on a similar project that would really like your input! Never Mind! I see you've already joined in!
Through plain glass it should be okay as long as it's perpendicular to the glass. For angled glass you would want to have a gasket between the individual sensor tx/rx optics and the glass since LIDAR-Lite transmits and receives at the same time and any reflections up close would cause crosstalk. Also low-e glass or glass that's been treated to be energy efficient will attenuate the IR significantly.
The resolution of the sensor is 1cm and at short range the accuracy would be around 1% of measured distance based on our testing. So LIDAR-Lite may not be what you are looking for in terms of absolute accuracy. A phase based rangefinder, like those that are sold for construction, might be you're best choice.
That's an awesome project!
the zero reference is the top of the PCB which you can see on the connector side of the unit. You can, however, adjust the zero reference to be what you want by writing an 8 bit signed value in control register 19 (0x13). This currently is in volatile memory and would have to be reloaded at every power up of the sensor.
Sorry about the confusion! Our data sheet and operating manual contain info on several possible permutations of LIDAR-Lite. The product being offered now is the laser/PIN model with a maximum range in the 40-60m range. The maximum range, of course, will vary with the reflectivity of the target. We do plan on having shorter range LED based sensors available in the not to distant future.
No public wish lists :(