Abstract
When the light-emitting diode meter is operating in the middle linear region of the light modulation characteristics in the microwave range, photodetectors of the photoelectron multiplier (PMT) type do not restore changes in the demodulated signal depending on the distance. The solution of this problem using optical frequency conversion by introducing a second identical modulator at the second frequency is considered. According to this principle, the functional construction scheme of a rangefinder "0" class is proposed, the accuracy of which is estimated to be mφ = 0.01-0.02 mm.
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