GAS CONCENTRATION FIBER-OPTIC TRANSDUCER Russian patent published in 1995 - IPC

FIELD: measurement technology. SUBSTANCE: transducer has measuring channel. The first and the second additional channels are introduced at input and output of the dish. Each channel has laser, optical connector, transmitting light guide, collimating and focusing lens, receiving fiber light guide, optical connector and photodetector. All the units are conjugated optically and mounted in sequence. Modulator is connected to input of the laser, which modulator operates at frequency being different from frequency of modulator of the main measuring channel. Outputs of photoreceivers of the first and the second additional channels are connected electrically with input of general amplifier. Outputs of amplifier of the main measuring channel and amplifier, which is common for additional channels, are connected with identical electrical parallel circuits. Each circuit has frequency selection two filters, which have outputs connected with output of corresponding amplifier being common for the filters, and two analog-to-digital converters. Input of each converter is connected with output of corresponding frequency selection filter. Outputs of analog-to-digital converters are connected to four inputs of computational unit. Output of the computational unit is connected to input of indicator. EFFECT: improved precision of measurement. 3 cl, 1 dwg