SU1638581A1 - Pressure gauge - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the pressure of liquids and gases. The aim of the invention is to increase the speed and accuracy. The pressure gauge contains a luminescent crystal, such as a ruby, whose luminescence frequency depends on pressure. Radiation that excites luminescence. and luminescence emission is inputted and outputted through the lens or light guide cable 7. The crystal is installed in a housing made of a material whose acoustic impedance is equal to the acoustic impedance of the crystal, which provides speed by eliminating the influence of the backward compression wave. The body is fixed in the wall 3 of the medium-controlled vessel. 1 hp f-ly, 4 ill.

Description

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with

About CJ 00

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00

FIG b

The invention relates to a measurement technique and can be used to measure the pressure of liquids and gases.

The aim of the invention is to increase speed and accuracy.

Figures 1-4 show variants of the design of the pressure gauge.

The pressure gauge contains a luminescent crystal 1, made of a ruby or other substance, which has the effect of shifting the luminescence line under the influence of pressure. The crystal 1 is fixed on the body 2, which is installed in the wall of the vessel 3 with the controlled medium by means of the mount 4. The radiation input-output device contains an optically transparent face 5, a lens b or a light-guided cable 7. Case 2 is made of such material, the acoustic impedance of which is equal to the acoustic impedance of the luminescent crystal 1,

The pressure gauge operates as follows.

Luminescent radiation is excited in crystal 1 by radiation with a shorter wavelength, such as laser radiation or radiation from a mercury lamp. By applying pressure to the face of crystal 1 facing the inside of a vessel with a controlled medium, the luminescence radiation varies in frequency so that the vertex the contour of the ruby RI line is shifted by an amount proportional to the pressure.

The excitation radiation is supplied to the crystal 1 through a radiation I / O device (5-7). In the same way, the luminescence emission is removed from the crystal, which is then fed to a spectral instrument for measuring the contour of the spectral line. In order to increase the measurement accuracy on the face 5, the lens b is tightly fixed optically, it focuses the laser beam in the center of the crystal, and from the same place the luminescence emission is output through the lens 6.

The measurement accuracy is increased due to the fact that with one-sided loading of a crystal, the maximum frequency shift of the radiation takes place on the axis at the center of the crystal.

To provide a more rigid optical connection of the crystal with the spectral device, a fiber optic cable is attached to the radiation I / O device,

this also results in a reduction in vibration sensitivity.

Fastening the crystal in an acoustically matched case provides an increase in the speed of the pressure gauge.

Claims (1)

Claims 1. A pressure gauge comprising a housing in which a luminescent crystal is installed, the luminescence frequency of which depends on pressure, as well as a radiation input and output device, characterized in that, in order to increase speed and accuracy of measurement, in it, the body is made of a material whose acoustic impedance is equal to the acoustic impedance of the crystal, and the radiation input and output device is made in the form of a lens mounted coaxially with the crystal at a distance from its center, equal to the focal length of the lens. 2 A meter according to claim 1, characterized in that, in order to reduce vibration sensitivity, an input device and The output of the radiation is made in the form of an optical fiber cable connected optically with a high-brightness crystal. "I1  /, /, T /, i figl # s # r FIG. 2  /, # /, / Л & Fig.z / / 9