SU1631329A1 - Pressure sensing head - Google Patents

Abstract

The invention relates to a measurement technique, in particular, is used in the mining industry, and is intended to measure constant, variable, and pulse pressures in optically transparent media, for example, in the control of blast waves. The purpose of the invention is to improve the accuracy of measuring the degree of rarefaction. A fiber-optic converter 3, made in the form of emitting and receiving light guides, is fixed in the cylindrical housing 1 at a distance h0 from the inner surface of the membrane 4. A sealed cap 5 is installed on the outer side of the membrane, forming a cavity with constant pressure. When creating a vacuum in the cavity 7, the membrane 4 moves to the transducer 3, and therefore the magnitude of the luminous flux incident on the receiving optical fibers changes, which is a measure of the magnitude of the pressure. 2 Il. and CO

Description

The invention relates to a measurement technique, in particular, is used in the mining industry, and is intended to measure constant, variable and impulse pressures in optically transparent media, for example, in the control of blast waves.

The purpose of the invention is to improve the accuracy of measuring the degree of rarefaction.

Figure 1 shows a pressure sensor; FIG. 2 shows a characteristic of its fiber optic converter.

The device contains a cylindrical body 1, perforated by radial holes 2. 3, a fiber-optic converter 3 is fixed behind-1, made in the form of radiating and receiving light guides, which is located at a distance h0 from the inner mirror-reflecting surface of the membrane 4, fixed from the end of the body . On the outer side of the membrane there is a sealed cap 5, which forms a cavity with constant pressure. Cutting plug

6 is fixed on the housing 1 and fixes the sensor in the controlled cavity 7. The connection seals the gasket 3.

The device works as follows.

When creating cavity resolution

The 7th membrane begins to approach

ABOUT

with so

No

WITH

the converter 3, since the cavity of the housing 1 is connected to the cavity 7 by radial holes. The characteristic of the converter (the dependence of the output signal U and on the distance h) depends on the location and number of optical fibers and is formed as follows. The light flux from an external source is supplied to the membrane 4 through the optical fibers 3. Reflected from the membrane, it again enters the optical fibers 3 and is fed to photo registration. The magnitude of the reflected flux depends on

16313294

The initial working point 9 is located on the non-working part of the converter at a distance h0, therefore, the conversion to the membrane deflection is initially absent. Then the vacuum level reaches the value to be measured. In this case, the converter goes to the linear working area

Yu (points 10-11), where readings in the required pressure range are taken with maximum accuracy. The membrane is calculated from the measured pressure range, the length of the working

the distance h (i.e., the deflection of the membrane), 15 branches, the characteristics of the converter, as well as the strength of its total deflection under vacuum.

The use of the proposed device allows for a reduction in the decryption time of process records due to more accurate registration, as well as a reduction in the size and weight of the instrument by simplifying the amplification path.

20

since the fiber emits and perceives light by the ends within the aperture angle. The light guides 3 can be divided into two groups receiving and lighting, and can simultaneously perform both functions. In the latter case, for a photodetection in the path of the reflected flux after the optical fibers, an inclined semitransparent mirror is established, and the characteristic has a smoothly decreasing character proportional to the value 1 / h2.

In the case of separation of the light guides into two channels, the receiving and illuminating emitter and photodetector are installed at the ends of the respective groups, and the characteristic has a more complex gabled shape (Fig. 2). When the fiber is adjacent to the membrane (U 0), the output signal is zero, 35 As h increases, more and more of the receiving fibers are illuminated by a reflected conical flow and the signal grows, reaching a maximum. Further, if the receiving and lighting evstovo waters are mixed, then as h grows, a zone of insensitivity to movement is formed, due to the illumination of the more distant receiving fibers. Then the signal decreases, as in the previous case, in proportion to 1 / h.

Claims (1)

Invention Formula A pressure sensor containing a hollow cylindrical body, on the end of which there is a membrane with a mirror reflecting surface and a fiber-optic displacement transducer, made in the form of light guides, the ends of which are located in the cavity of the body opposite the membrane with a gap relative to it, in order to improve the accuracy of measurement of discharge, in it the body is equipped with a cap mounted on its end outside the membrane with the formation of a sealed cavity, and on the cylindrical surface of the body Sa are made openings for communicating a cavity in which the ends of the light guides are placed with the source of the measured pressure. Invention Formula A pressure sensor containing a hollow cylindrical body, on the end of which there is a membrane with a mirror reflecting surface and a fiber-optic displacement transducer, made in the form of light guides, the ends of which are located in the body cavity opposite the membrane with a gap relative to it, increase the accuracy of measurement of discharge, in it the body is equipped with a cap mounted on its end outside the membrane to form an airtight cavity, while on the cylindrical surface of the building and provided with openings for communicating the cavity in which the ends of optical fibers placed with the source of the measured pressure. Editor I. Segl Nick Compiled by E.Shva Tehred L. Serdyukova . Order 536 Circulation 344 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Phie.1 FIG. I Proofreader M.Maksimishinets Subscription