SU674253A1 - Device for operability testing of apparatus with piezoelectric transducers - Google Patents

Description

Directly to the non-inverter (I am the input of the differential amplifier.

Fig, 1 shows the block diagram of the proposed device; FIG. 2 shows an oscillogram of recording parameters and output of the device:

The device is connected to the piezoelectric sensor 1 through the primary winding of the controller 4, to which the iiofjiacyromee device 3, the low-pass filter 4 and the differential YcffiSfSib 5 are sequentially connected. voltage, while the secondary winding of the transformer 2 is connected to the output of the generator 6, and vr code of the matching device 3 through the postDeva / telno connected amplifier 7, detector 8, limiter-stabilizer 9 Torr and voltage divider 10 u) dklyuchen neshtertiruyuschemu to the input of the differential amplifier 5.

When the object vibrates, the signal U (cm, figl) from the piezoelectric transducer 1 is fed through the matching device 3 and the filter 4 of the lower frequencies to the scribing input and the differential amplifier 5 ,. and from the output of the differential amplifier, this chip is fed to the recorder, the make-up artist to the screen of the oscillograph, at the same time, alternator b is supplied with variable voltage with the frequency located behind the passband of the filter 4 and the amplitude not more than 0, the dynamic range of the matching device 3. matching device 3 etb voltage is sent to the input of amplifier 7 and after amplification is fed to detector 8. From the output of detector 8, a constant tag goes to the stabilizer stabilizer 9, and then to divide 10 divider 10 resistors res. 1 ps 1She voltage removed c. divider 10, doyodits to Yyuchyny, when it is applied to the circuit of the non-inverting inputs of the differential amplifier 5, at its output a working (initial) level is established — the constant voltage Ub with a value of 0.5 of the U measurement scale (see FIG. 2) the initial Up level, while maintaining the parameters of the channel channel E, the measurement process should remain constant (stable), which is a criterion for the operability of the equipment entering the measuring channel. When you save the parameters of the measuring channel, the stabilizer 9 stabilizes the system. stability in constant voltage supplied to a non-inverting input of a differential amplifier 5. Changing the operating (initial) level Up to values i rlin ir .. or decreasing it to zero level Uo (see Fig. 2), caused by changing parameters

The measuring channel in the process of measurement is the one-piece failure of the equipment included in the measuring channel or the connective probe.

 As mentioned above, the frequency of the signal supplied from oscillator 6 is behind the low pass fillet 4, so this signal is supplied as a constant voltage | dga only to the non-inverting input / supply amplifier 5, the measured variable signal U ( C is fed to its inverting input A. Since the amplitude of the oscillator supplied by generator b is not more than 0.1 times the maximum altimeter (voltage of the measured signal Ug at the input of the matching device 3), the diaamic range of the matching device by measure emomu signal almost not narrowed.

In the process of measuring information about the health of the device entering the measuring signal, is transmitted in the form of a constant voltage level Up, and the measured variable signal is recorded relative to this level (see Fig. 2).

The proposed device provides a reliable, non-shuffled test of the operability of equipment with piezoelectric sensors, yt of information or the reduction of information capabilities of devices.

Claims (1)

Invention Formula Device and hardware testing of equipment with piezoelectric data operability checks of the Instrument in the measurement process, a geytor is introduced into it; j ntStleHb, detector, limit the tabm i drop, voltage, while winding the transformer Ator is connected to the generator, and the output matching device yosledovately soedineshp .. amplifier de1e1stb |), {og) any Shtele stabilizer and voltage divider DAPR odkyyuchoy to the non-inverting input of the amplifier differoysha Gnogo, Sources of yyforkatsii, uk ing thi in vshshshshspri ekspertgazze I. USSR author's certificate N 296038, cl. G 01 P 21/00, G1. , 2 "А§ Ь с1 СООЙ Шй Йехел he USSR No 488995, fcn / G OTN 11/00. 1976.