SU1303844A1 - Method of calibration checking of equipment for measuring vibrations with piezoelectric transducer and calibrating piezoelectric element - Google Patents

Abstract

The invention relates to vibration measuring equipment and is intended for calibrating vibration measuring equipment during its operation at an object. The aim of the invention is to increase the calibration accuracy and to expand the area of its application due to the identity of the spectra of the measured and calibration signals. A method for calibrating vibration measuring equipment with a piezo sensor is carried out as follows. First, the vibration signal NJ is measured directly, then the calibration piezo element of the sensor is excited with the inverted output signal of the measuring path. The calibration of the measuring path is made by changing its transmission coefficient to a predetermined value. 1 il. EJO 00 00 4 4;

Description

The invention relates to vibration measuring equipment and is intended for calibrating vibration measuring equipment during its operation at an object.

The purpose of the invention is to show the calibration accuracy and expand its field of application due to the identity of the spectra of the measured and calibration signals.

The drawing shows a structural diagram of the device that implements the method of calibration of vibration measuring equipment with a piezo sensor.

The device comprises a piezoelectric sensor 1 having a working 2 and a calibration 3 piezoelectric elements mechanically interconnected. The output amplifier 2, the processing unit 5 and the display device 6, are connected to the output of the working piezoelectric element 2, the second output of the processing unit 5 is connected to the calibration piezoelectric element 3,

A method for calibrating vibration measuring equipment with a piezo sensor is carried out as follows.

The vibration of the object under study is converted into voltage by the working piezoelectric element 2 of sensor 1, which is amplified by charge amplifier 4 and measured by processing unit 5. Measurement result M, object vibration

N,

KH.

where K is the gain of the measuring path;

X is the measured value of the vibration of the object, recorded by the processing unit 5 and outputted to the display device 6. To calibrate the vibration meter, an additional measurement is performed, in which the calibration piezoelectric element 3 of sensor 1 is excited with the output signal of the measuring path 3. The result is N measurement result of vibration X of the object KX

N,

K „, p K,

Where

 - coefficient of inverse piezo

zoeffect of the calibration of the 3 piezoelectric sensor 1. From the obtained measurement results we find the coefficient K of the transmission of the measuring path of the vibration equipment

five

0

five

0

TO

N, -N N..K,

 1 06 r

Claims (1)

The calibration of the measuring path is carried out by changing its coefficient K f, the transmission to a given value. Invention Formula A method of calibrating vibration measuring equipment with a piezo sensor and a calibration piezo element, which means that a voltage is applied to a drawing piezo element, which excites it, and the voltage corresponding to the vibration of the object and the calibration piezo element are removed from the piezo sensor, which measure the transfer rate of the measuring circuit. that, in order to increase the calibration accuracy and expand its area of application, the calibration piezoelectric element is excited by a reinforced and inverted using a piezoelectric transducer, and 5, the transmission coefficient K of the measuring path is determined from the ratio 0 five TO . N, where N, and K „oer L -Array results of measuring the vibration of an object without excitation and with the excitation of a calibration piezoelectric element; coefficient of the inverse piezoelectric effect of the calibration piezoelectric element. t G