METHOD FOR MEASUREMENT OF COEFFICIENT OF ATTENUATION OF DIRECTED LIGHT IN GASEOUS AND LIQUID MEDIA (VARIANTS) AND APPLIANCE FOR ITS IMPLEMENTATION (VARIANTS)

摘要

The invention is intended for measurement of coefficient of attenuation of directed light in semi-transparent media. It can be used in systems for control of environment and technological processes. The method and the appliance for measurement of coefficient of attenuation of directed light in gaseous and liquid media are built on use of two sources and two receivers of directed light, those are placed in separated points in medium in such way that both receivers are in rays of the first and the second sources. One measurement of index of attenuation is performed in four strokes with fixation of signals at outputs of receivers at two different values of brightness of the first and the second source, one performs n measurements and average value of coefficient of attenuation is calculated by dependence determined. To the unit (fig. 2) are included the first 1 and the second 2 blocks of light sources D1 and D2 first 3 and second 4 blocks of light receivers P4 and P2 , first 5 and second 6 CAP1 and CAP2, first 7 and second 8 ACP1 and ACP 2 and microprocessor 9 MP. Each block of light source includes source of directed light 10, semi-transparent mirror 11, illuminators 12 and 13. Each block of light receivers includes receiver 14, semi-transparent mirror 15 and illuminators 16 and 17. Semi-transparent mirrors in all the blocks are installed at angle, for instance 45 DEGREE , to axis of optical trajectory. The blocks are placed at angles of rectangle for formation of optical trajectories. At that the first optical trajectories of the first and the second blocks D1 and D2 coincide with the axes of the second optical trajectories of the first and the second P1 and P2 , respectively. At that inputs of the blocks of light sources D1 and D2 are connected to the outputs of digital-analog transformers 5 and 6, inputs of which are connected to micro-processor 9, its inputs are connected to analog-digital transformers 7 and 8, those are connected to the outputs of blocks of receivers P1 and P2 . Second version of the device (fig. 3) differs from the first one by the fact that first source and first light receiver D1 and P1 areplaced together in set of optical-electronic block 1. Technical result is exclusion of effect made on result of measurement from unsteadiness of source and sensitivity of light receiver, coefficients of light absorption in optical sections of the devices and illuminators of external lighting, this increased accuracy of measurement.