Dear anyone can guide me? I could not retrieve back scattering coefficient graphs from my data. even I detect distance of clouds with Mie scattering lidar. I might wrong with my data.
I am using on reflecting as well as refracting telescope for Lidar with IR Laser. Thank you brother.
Which method do you use to retrieve the backscatter coefficients? Klett's method? Klett-Fernald-Sasano method?
Is your lidar single-wavelenght?
In a prior order, have you checked the quality and consistency of the power signal you are measuring? I.e. background removal by calibration, range-correction, adequacy of the gain and the dynamic margin of your signal...
If so, how does it look the signal in a cloudless measurement? Can you try to remove the molecular contribution profile using a simulated exponential with temperature and pressure? If so, can you see any bump or structure for the first km?
Have you checked the overlap function of your configuration? Are the telescope and the lidar correctly aligned?
I am very grateful to your reply and suggestion. I am using Klett backward inversion method, to retrieve back scattering coefficient ,with single wavelength 1064 nm, Nd.YAG laser. what do you mean by consistency and quality of power signal? I am using high resolution oscilloscope 1G/Sas with averaging feature.
your SNR mostly, once you do the range-square correction.
Also check for any artifacts like bumps in your profile -they should be noticeable when removing the molecular trend-.
Which results are you getting by now applying Klett backward?
PS: which type of receiver are you using, photon-counters or an analogic signal with a photodiode like APD?
What is exactly what you get when you apply the Klett backward method? Negative data? Zeros? Unrealistic profiles? NaNs? You have to clarify what you are getting in order to help you a bit more. Otherwise it's too generic.
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