FIELD: optical material composition analyzers. SUBSTANCE: device has radiation source, optical system for shaping two light beams, working and reference trays, and light detectors connected into differential circuit, as well as amplifier and control unit. Introduced in device is deflector whose electrodes are connected to control unit output. Inclined side wall of reference tray is made as 180 deg. segment of collecting lens and working surface of tray is shaped to obey law ensuring linearity of device transformation equation. Electric signal in deflector electrode circuit is directly proportional to concentration being measured. EFFECT: improved measurement accuracy. 3 dwg
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