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I have read papers that use LIDAR-like and LIDAR-Raman systems that detect elements.

I want to measure the vapor water ($\rm H_2O$) and $\rm N_2$ of trees/agriculture using Arduino and low cost elements (DIY).

I am thinking of using 405 nm, 50 mW laser. The problem is how can I detect the returned wavelength?

What I am thinking:

  1. A CCD sensor?
  2. A Photodiode array?
  3. A modified webcam?
  4. A photodiode with a filter?

My question is what do I measure with the wavelength sensor? The time from when I send the pulse of the laser and the time it returns in the wavelength sensor? Only the wavelength? Should I send a specific coded message with the laser? For example 101010011?

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  • $\begingroup$ I’m thinking you first need a laser safety officer to discuss shining a 3b/borderline 4 laser around outdoors. Also note that you need some really good optics folks to make LIDAR, much less LIDAR/Raman work. $\endgroup$ – Jon Custer Sep 25 at 20:23
  • $\begingroup$ Yes, You are right, I meant 50 mW. My fault! $\endgroup$ – just_learning Sep 25 at 20:50

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