DOUBLE-BEAM PHOTOMETER Russian patent published in 1996 - IPC

FIELD: instrument engineering; measurement technology. SUBSTANCE: photometer has timer, modulated light basic and additional sources, measuring, standard and two additional optical paths, measuring photoconverter with tunable conversion coefficient, additional photoconverter, two devices for separating signals from basic and additional light sources, two peak detectors, two comparison circuits, reference voltage supply and tunable supply of basic light surface. Device also has comparing threshold device connected in series with neutral light filter switch unit which switches from output of modulated light basic source to input of measuring photoconverter. Analog-to-digital converter of the device is connected in series with digital indicator. Additional reference voltage supply is connected to second input of comparing threshold unit. First input of comparing unit is connected to output of measurement of measuring photoconverter. Input of analog-to-digital converter is connected to measuring output of measuring photoconverter. EFFECT: improved precision of measurement. 1 dwg