SU1462123A1 - Device for measuring parameters of rotating objects - Google Patents

Description

one

The invention relates to thermometry and is intended for contactless measurement of the temperature of local surface areas of rotating objects, as well as deformation and speed of rotation.

Devices for measuring parameters of rotating objects are known, comprising a moving sensor and a measuring transducer, a fixed recorder associated with the measuring transducer of an inductive or capacitive channel of a radio channel or a septic channel.

A common drawback of such devices is the limited range of their application, which is associated with the possibility of fixing an electrical sensor in the required area of a rotating object and low measurement accuracy in the presence of electromagnetic fields, for example, in electric machines.

It is also known a device for measuring the temperature of a gas turbine blades, containing two photodetectors connected to respective amplifiers, a key circuit connected

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N3

D 00

200 ° C

Kitsu output of one of the amplifiers with the recorder and to the control input of which the output of the other amplifier is connected. In such a device, the temperature of a moving object is determined by its own thermal radiation and, therefore, the installation of a separate temperature sensor is not required.

However, the measurement accuracy of this device, as well as of all pyrometric devices, is low, and the lower limit of the temperature range is also (limited by the order of magnitude + this is due to the weak intense radiation of the heated body at wavelengths at which the temperature measurement of the photo-electric and color pyrometers, when the intensity of the measured signal is commensurate with the photodetector noise.

The closest in technical essence to the invention is a device for measuring the parameters of the winding of objects, containing a light source, a photodetector with an amplifier, a sensitive element, whose optical properties depend on the measured parameter, placed on a rotating object and optically coupled to a light source and photoreceiver. display unit.

The disadvantage of the device is that the measurement accuracy is not high, since, besides the light of reflected (or transmitted) from the sensing element and carrying useful information about the value of the measured parameter, extraneous light reflected from the surface of the object itself enters the photodetector. The level of the interference signal that occurs at the photoreceiver output can be commensurate with the signal coming from the sensing element, as well as exceed it. This complicates the information processing process and requires the introduction of special devices that increase the signal-to-noise ratio.

The purpose of the invention is to provide a high accuracy of measurement of the parameters of a rotating object.

The goal is achieved by the fact that a device for measuring the parameters of rotating objects, containing a light source, a photodetector with an amplifier, whose optical element has optical properties

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15

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25

from the measured parameter, placed on the rotating object and optically connected to the light source and photoreceiver, the display unit, an additional photoelectric receiver with an amplifier optical element with a reflection coefficient different from that of the rotating object, placed on the rotating object and optically connected to the source light and an additional photodetector, and a key circuit connecting the output of the amplifier of the first photodetector with an indication unit, whose control input connects An additional photodetector amplifier output.

An increase in the measurement accuracy of the parameters of a rotating object is ensured by the synchronization of the measurement period by the signal from the optical element, the coefficient. the reflection of which is different from the cofi1 tape of the reflection of the surface of a rotating object by at least 1.5 times due to synchronous procedure in front of the general;

parallel pairs of light guides as

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block diagram

The drawing shows the proposed device.

The device contains a light source 1, a temperature-sensitive element 2 attached to a local surface area of a rotating object; light guides. 3 and 4, the ends of which are directed respectively to the thermoelement 2 (to the trajectory of its rotation) and to the optical element 5, the free ends of which are connected respectively to the light source 1 and the photodetectors 6 and 7, a matching amplifier 8 connected to the output of the photodetector 6 and the amplifier-driver 9, connected to the output of the photodetector 7, a key circuit (analog switch) 10,

connecting the output of the matching amplifier 8 with the analog display unit 11, and to the control input of which the output of the amplifier 9 is connected,

The device works as follows.

The light flux from the light source 1 illuminates through the optical fibers 3 and 4 the sensitive element 2 with temperature

Claims (1)

DEVICE FOR MEASURING THE PARAMETERS OF ROTATING OBJECTS, containing a light source, a photodetector with an amplifier, a sensitive element, the optical properties of which depend on the measured parameter, placed on a rotating object and optically connected with the light source and a photodetector, an indication unit, characterized in that, for the purpose of to increase the accuracy of measurement, an additional photodetector with an amplifier, an optical element with a reflection coefficient different from the reflection coefficient of the surface of a rotating object placed on the rotating object and optically coupled to the light source and further light detector, and a key circuit connecting the output amplifier of the first photodetector with a display unit, the control input of which is connected to the output of the additional amplifier photodetector.