SU1420483A1 - Humidity meter - Google Patents

Abstract

The invention relates to the field of technical physics and can be used to control moisture in chemical, textile, and others; webshennost. The aim of the invention is to improve the accuracy by compensating for the time and temperature instability of the cocoons of the emitting diodes and to ensure the interchangeability of the emitting diodes. The moisture meter contains a hemispherical mirror with a hole in the center, at the focus of which radiating diodes are mounted, the direct radiation of which falls on an additional photodetector, which converts these streams into an electrical signal and delivers to the control input of the automatic leveling unit. 1 pe. From $

Description

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The invention relates to technical physics and can be used to control moisture in the chemical, textile, silk and other industries.

The purpose of the invention is to improve the measurement accuracy by compensating for; the belt and temperature instabilities of the fluxes of radiating diodes; and ensuring the interchangeability of radiating diodes with a large scatter of characteristics.

The drawing shows a block diagram of the moisture meter.

The moisture meter contains a driver generator 1, a unit 2 for automatic alignment of radiation fluxes of radiating diodes 3 and 4, a first photodetector 5 optically connected through a controlled object 6 to radiating diodes 3 and 4, a concave hemispherical mirror 7 with a hole in the center, at the focus of which the emitting diodes 3 and 4 are located, the second photodetector 8, optically connected with the direct radiation of the emitting diodes 3 and 4 through the hole in the mirror 7 and connected by an output to the control input of the automatic leveling unit 2, photoelectric signal use it with your signal input to the photodetector 5, a control input - to the generator 1, and the output - to the recording device 10.

The moisture meter works as follows.

The generator 1 generates a sequence of rectangular pulses C of the antiphase outputs of the generator 1 pulses through the automatic alignment unit 2 to the emitting diodes 3 and 4. The radiation from both the emitting diodes 3 and 4 is focused by a concave spherical mirror 7 and is directed to the monitored object 6, through which the photodetector 5, the direct radiation of the emitting diodes 3 and 4 through the hole in the center of the spherical mirror 7 goes to the photodetector 8, which converts these flows into an electrical signal and gives to the control input of the unit 2 automatic alignment.

For two-wavelength controlled channel devices, the main condition is the equality of the initial values of the fluxes of the best-performing diodes.

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When the reference or measurement flux is unequal or deviated from the emitting diodes 3 and 4, a signal appears at the output of the photodetector 8

5, an error that is applied to the automatic leveling unit 2 and changes the radiation of one of the emitting diodes until the radiation of both diodes is equal.

The flux levels of radiation from both radiating diodes 3, and 4 are aligned through the controlled object 6 to the photodetector 5, which converts them into an electrical signal. One of the fluxes at the reference wavelength does not depend on the value of the monitored parameter, and the other radiation flux on the measuring wave does not depend on the magnitude of the monitored parameter. The electrical signals corresponding to the indicated flows are alternately fed to the input of the photoelectric processing unit 9 “5” of the signal, which produces a signal proportional to the value of the monitored parameter. This signal is fed to the input of the recording device 10, according to which it reads the value of the monitored parameter.

Introduction of a spherical concave mirror, a unit 2 for automatic alignment of radiation fluxes of radiating diodes 3 and 4 and a photodetector 8

Claims (1)

35 makes it possible to maintain automatically the equality of the radiation fluxes of the diodes 3 and 4 with time or temperature variation of the radiation intensity. In the case of replacement of the emitting diodes, the necessity of their selection is eliminated, which makes it possible to reduce the costs of developing and configuring the device. Invention Formula 45 A moisture meter containing a master oscillator, two emitting diodes, the wavelength of one of which lies in the absorption band of the radiation of moisture, the other outside the absorption band, a photographic receiver, optically coupled through a controlled object to the emitting diodes, a photoelectric signal processing unit the input to the output of the fossate receiver, the control input — to the generator, and the output — to the recording device, about that and with the purpose of improving the measurement accuracy, it was entered into it luspherical mirror with a hole in the center, the second photodetector and the unit for automatic alignment of radiation fluxes of the emitting diodes, the signal input of which is connected to the output of the master oscillator, and the output to the emitting diodes, in the focus of the hemispherical mirror and through the hole in the mirror op. it is tied in conjunction with the second photodetector, the output of which is connected to the control input of the unit for automatic alignment of the fluxes of the emitting diodes.