SU911247A1 - Device for substance concentration measurement - Google Patents

Description

The invention relates to automation and computing and can be used in the study of microscopic objects.

Devices are known for measuring the concentration of a substance by determining the ratio between the integrated optical density and the area of the object 1}.

Closest to the invention by technical essence is a device for measuring the concentration of a substance, containing an optically coupled microscope and a photodetector, a log-analogue analog converter in series, the code whose input is connected to the output of the photodetector, the first element of equivalence and the integrator is dense; ti, and also the integrator ploshchali G2.

However, the known device does not provide the necessary accuracy of concentration measurement.

The purpose of the invention is to improve the measurement accuracy.

The goal is achieved by the addition of a second equivalence element serially connected to the device, one of the inputs of which is connected to the output of a logarithmic converter analog — a code, a counter and a third equivalence element, the output of which is connected to the second inputs of the first and second equivalence elements and the square integrator , and threshold value adjuster, the output of which is connected to the second input of the third equivalence element.

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The drawing shows a block diagram of a device for measuring the concentration of a substance.

The device contains a microscope 1, a photodetector 2, a logarithmic analog converter - code 3, second equivalence element 4, counter 5, third equivalence element b, threshold setpoint generator 7, area integrator 8, first element

20 9 equivalence and density integrator 10.

The device works as follows.

The object is set in the microscope

25 1 and successively move from relative to the photodetector 2. At the output of the photoreceiver 2, a signal is generated that is proportional to the intensity of the incident light from the local area of the object 30. In the absence of absorbing

the component is signaled relative to c: tabilen, and if present, it decreases depending on the light absorption. The signal from photodetector 2 is fed to a logarithm-1 converter 3 analog — a code in which it converts, for example, into bursts of pulses, the number of which in each pack is proportional to the optical absorption log, and the number of bursts of the object (scanning steps).

The output signal of the logarithmic converter 3 analogue - the code goes through the second element 4 equivalence, normally opened and closed by a signal from the third element b of equivalence to the counter 5, which can be made as digital indicator decades, and through it goes to the third element 6 of equivalence, where it is compared with a threshold signal defined by the threshold value generator 7. The setpoint threshold values 7 can serve, for example, discrete switches with digital position. On the unit, 7 threshold values are set by a horn signal equal to a background signal or a certain value of the object density. When the signal reaches the third element b, the signal is less than the signal set at the threshold setting unit 7, it is visualized on the counter 5, but the command signal is not generated at the output of the third equivalence element 6, and the integrator 8 does not add up area, the first element 9 of equivalence will remain closed and the signal from the logarithm 1 of the converter 3 analogue - the code does not fall on the integrator 10 density

In the case when the signal arriving at counter 5 is equal to or exceeding the threshold, at the output of the third element b of equivalence, a signal occurs that will trigger the integrator 8 square, close the second element of equivalence and open the first element 9 of equivalence. The density integrator 10 is supplied with signals proportional to the measured density.

After each local measurement of the object with the arrival of the next signal, the counter 5 is automatically reset.

The 8 area and 10 density integrators are reset after full

measurement cycle by the operator or automatically when restarting.

The application of the invention allows to increase the productivity and accuracy of concentration measurements.

Claims (2)

Invention Formula A device for measuring the concentration of a substance containing an optically coupled microscope and a photodetector connected in series 5 code, the input of which is connected to the output of the photodetector, the first element of equivalence and density integrator, as well as the area integrator, which is different from that , In order to improve measurement accuracy, the device contains a second equivalence element connected in series, one of the inputs of which is connected to the output of a logarithmic converter. An analogue is a code, a counter and a third equivalence element, the output of which is connected to the second inputs of the first and second equivalence elements and the square integrator input, and the setpoint generator threshold values SRI, the output of which is connected to the second input of the third element of equivalence. Source: nicknames of information taken into account in the examination 5 1. Polonik B.C. Television automatic machines. M., Sve, 1974, p. 1 bb. 2. USSR author's certificate 425087, cl. G 01 N 21 / 22,12.04.71 (prototype).