SU463937A1 - Device for measuring the optical characteristics of aerosols - Google Patents

Description

Photodiode 7. Using the subtraction circuit 13, the signals from the detector 12 are subtracted from the signals of the detector 10. The difference in voltage of these signals is proportional to the flow, due to the distance of the probe beam in the opposite direction:

V

F

13

rn

In the subtraction circuit 14, the signals from the output of the synchronous detector 12 are subtracted from the signals coming from the delay line 16. The difference between the voltages of these signals is proportional to the flux emitted by the emitter-reflector-receiver path:

and and 01

Obviously, when reflected from a reflector 4 with a frequency of / 2, not only the light probing flux is modulated, but also the energy of the sun 5 scattered by cloud particles in the direction coinciding with the "reflector-emitter" direction. This stream, reflected from the reflector 4, is attenuated to the clouds and also goes to the apr; 8. The device, proportional to this stream, is extracted using a subtraction circuit 15 to the input of which signals are sent from the secondary frequency detectors And 12:

The signals from the outputs of the subtraction circuits 13, G4 and 15 are fed to the information recording device.

Subject invention

A device for measuring the optical characteristics of aerosols, comprising a modulated light source, a reflector, a radiation receiver, an amplifier, a subtraction circuit, a delay line, a carrier frequency detector and a recording unit, characterized in that it is equipped with a secondary frequency modulator to improve measurement accuracy , installed in front of the reflector, and synchronous detectors of the secondary modulation frequency, which are connected to the registration unit through a subtraction circuit and a delay line.