SU883682A1 - Pressure pickup - Google Patents

Description

(54) PRESSURE SENSOR

one

The invention relates to instrumentation engineering, in particular to pressure sensors.

Piezoelectric pressure sensors are known that include a housing with a piezoelectric element 1 located therein.

However, these sensors do not provide sufficient accuracy in measuring static pressures.

The closest in technical essence and the achieved positive effect to the present invention is a pressure sensor device comprising a housing with a support, a piezoelectric element, the electrodes of which are connected to a generator and a measuring device 2.

A disadvantage of the known technical solution is the low conversion rate of the generator signal in the piezoelectric oscillatory system, which reduces the accuracy of the pressure Measurement.

The aim of the invention is to improve the accuracy of pressure measurement.

This goal is achieved due to the fact that one of the electrodes of the surface of the piezoelectric element is divided into an even number of electrically isolated sectors, odd ones

which are interconnected and connected to the generator output, and even sectors electrically interconnected. connected to the measuring device. In addition, the sensor support is made movable with profiled protrusions corresponding to the number, shape, and location of even sectors of the piezoelectric electrode.

Figure 1 shows a diagram of the sensor; Fig. 2 shows the layout of the piezo element sectors.

The sensor includes a housing 1, made in the form of a cup, the bottom of which acts as a membrane, a sleeve 2 that provides electrical insulation of the piezoelectric element 3 from the housing 1, a support 4, a nut 5 and conductors b, 7

20 and 8. One of the electrodes of the piezoelectric element 3 (FIG. 2) is divided into an even number of electrically isolated sectors, the odd ones of which are interconnected and connected to the output of the generator using conductors 7 and 8, and electrically interconnected through the support 4 even the sectors are connected with the help of wireliBOB b and 8 to the measuring device. The support 4 is made with profiled protrusions corresponding to the number, shape and location of the even-numbered sectors of the piezoelectric electrode 3, and with the help of the nut 5 can be moved in the sensor housing 1, pressing the piezoelectric element 3.

The sensor is as follows.

The generator excites the piezoelectric element 3 at the resonant frequency of its natural oscillations. Under the action of the pressure transmitted by the membrane of the sensor body 1, the piezoelectric element 3 is compressed, resulting in a change in the voltage across it, which is detected by the measuring device and is associated with the measured pressure.

The increase in the conversion ratio of the generator signal, by increasing the number of sectors of the generator section of the described piezoelectric oscillatory system, makes it possible to increase the accuracy of pressure measurement.

Claims (2)

1. Pressure sensor, comprising a housing with a support, a piezoelectric element, electr $ whose genera are associated with a generator and a measuring device, characterized in that, in order to improve the pressure measurement accuracy, one of the electrodes of the piezoelectric surface is divided into an even number of electrically insulated sectors, the odd ones of which are interconnected and connected to the generator output interconnected even sectors are connected to the measuring device, 2. The sensor according to claim 1, is different from the fact that the support is made / movable with profiled protrusions corresponding to the number , form and location of the even sectors of the piezoelectric electrode. Sources of information taken into account in the examination 1. Author's certificate of the USSR 444959, cl. G 01 L 9/08, 04/28/72. , 2. Authors certificate of the USSR 508699, cl. G 01 L 9/08, dated 09/17/74 (prototype). eight