Any suggestions on line laser modules having wavelengths more easily detectable in sunlight?
I am bouncing a line laser off of a surface and measuring its position with a camera. Right now I'm using a red laser with a good bandpass filter on the camera to cut down on light interference. But the setup isn't working very well outside in the sun.
Can anyone recommend a line laser module? I found a good selection of filters and I'd really like to use something even as high as 1550nm, but they don't seem to make line laser diodes that high. Does anyone have a suggestion for a line laser that works well in sunlight?
Posted Jan 25, 2019, 11:07 PM UTC
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There’s a Fraunhofer line in our atmosphere around 761nm iirc, but I’m not sure if there are any lasers there.
Ideally you’re able to synchronize the exposure with your laser pulse, or even better, sync your scanline with your laser sweep... https://youtu.be/8__WJb06h5E
This lets you use a low power emitter in sunlight.
Very interesting techniques. There's a lot I don't know about structured light scanning.
The laser I'm using though is a simple laser diode with a cylindrical lens rather than a scanning mirror or anything like that. It has an automated power control circuit for constant light output power, so it's pretty much steady-state.
I'll check into that absorption line, thanks!