SU1303861A1 - Pressure transducer - Google Patents

Abstract

The invention relates to a measurement technique and reduces the measurement error by maintaining a constant gap between the string and the electrode. The sensor is made in the form of a manometric spring I, to which the fixed end is attached an insert 3. A string 2 to which a full pulling force is transmitted from the spring 1 under the action of the measured pressure is fixed to the movable end of the spring with one end, to the insert 3 Electrode 4, mounted on insulator 5, excites vibrations of the string, the natural frequency of which varies with pressure. The distance from the plane of the string 2 to the center of the spring is calculated from a certain ratio. 1 il. (L

Description

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The invention relates to a measurement technique, namely to pressure sensors of high-temperature environments.

The purpose of the invention is to reduce the measurement error by maintaining a constant gap between the string and the electrode.

The goal is achieved by the fact that the electrode is installed parallel to the direction of movement of the free end of the manometric tube L, which arises due to the linear elongation of the string when the pressure and temperature change, the manometric tube is provided with an insert attached to its fixed end and set at a distance E from the plane of the string to the center of the spring, equal to R cosui., where R is the radius of the central axis of the spring; ci, is the angle between the direction of movement of the free end of the spring and the tangent to the central axis of the spring, is determined from the ratio

about arctg

1 - cos} f T - siiiy

where y is the central angle of the spring.

The drawing shows a structural diagram of a pressure sensor.

The device includes a single-turn manometric spring 1, a ribbon string 2, an insert 3, an electrode 4 and an insulator 5.

The device works as follows.

The pressure p is converted by the spring 1 into the full pulling force Q, which is transmitted to the string 2, fixed

Editor E. Sligan

Compiled by E.Shva Tehred A. Kravchuk

Order 1298/41 Circulation 777 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d, 4/5

Production and printing company, Uzhgorod, Projecto st., 4.

NOI at one end at the movable end of the spring, and the other through the insert 3 - at a fixed one. As the pressure changes, the natural frequency of the string oscillates. These vibrations are excited and measured electrostatically using an electrode 4 mounted on insulator 5 parallel to the plane of the string.

Thus, the frequency pressure sensor has an increased measurement accuracy by maintaining a constant gap between the string and the electrode.

Claims (1)

Invention Formula A pressure sensor containing a manometric spring, a ribbon string, one end of which is fixed to the movable end of the manometric spring, an excitation and signal removal electrode mounted parallel to the string with a gap, characterized in that, in order to reduce the measurement error by maintaining a constant value the gap between the string and the electrode is provided with an insert attached to the fixed end of the spring, on which the other end of the string is fixed, while the distance from the plane of the string to the center of the spring is determined eats out of relationship E R cos oi, where R is the radius of the central axis of the manometric spring; v is the angle between the direction of the complete displacement and the tangent to the spring axis. Proofreader A.Zimokosov