An optoelectronic device for measuring the concentration of particulate matter in the flue gas

摘要

The invention relates to measuring technique, more specifically, to optical methods of analysis and may be used to measure the opacity of the exhaust gases in the energy industry and in transport. Optoelectronic device for measuring the concentration of particulate matter in flue gases comprises a transmitter consisting of a light source, the collimating element of the protective glass, the housing lightguide, holes for supplying protective gas receiver unit, consisting of two focusing elements, reference and measurement photodetectors protective glass body lightguide, openings for supplying the shielding gas, the first and second linear amplifiers with adjustable gain factors, the first and second logarifmatory, diff differential amplifier, a recorder, and a comparator, the output of the measuring photodetector installed in the receiver unit through the first linear amplifier with an adjustable gain factor is connected to the input of the first logarifmatora, the output of the reference photodetector via the second linear amplifier with an adjustable gain factor is connected to the inputs of the comparator and a second logarifmatora, logarifmatorov outputs are connected to inputs of a differential amplifier whose output is connected with the registrar. Additionally introduced bipolar switches and the third light conductor which is placed in the light-emitter unit and receiver unit is designed as a hollow tube, the axis of which coincides with the optical axis of the reference photodetector which is mounted in block; receivers optically coupled to the collimating element of the light source and is located diametrically opposite the measuring photodetector, the first logarifmatora output is connected to the inverting input of the differential amplifier, and the output of the second logarifmatora connected to the noninverting input of the differential amplifier, the housing receiver unit is pivotable through 180 °, and linear amplifiers through the bipolar switches are connected to the photodetectors. The proposed design of optic-electronics device for measuring the solids concentration in the flue gases improves the accuracy and reliability of the results obtained by compensating for the measurement error associated with contamination of the optical elements and recording noise, and the dark background characteristics photodetectors.