SU1068728A1 - Device for remote piezo pickup checking - Google Patents

Abstract

DEVICE FOR REMOTE CONTROL piezoelectric transducers mounted on the test object, comprising a switch, a generator of a sinusoidal signal, the unit control signal generating and an indicator wherein the switch inputs are connected to piezoelectric transducers, and an output coupled to the first input of the control signal generating unit, a second input coupled to the sine wave generator signal, characterized in that, in order to expand the functionality of the device by controlling the mechanical connection of the piezodates with the object under test, a vibration measuring transducer, a switch and an amplifier are inserted into it, the vibration measurement transducer is installed on the test object with the possibility of acoustic communication with piezoelectric sensors and connected to the indicator through a series-connected switch and amplifier, the second input of which is connected to the second the output of the switch connected by the second input to the output (L of the block forming the control signal.

Description

The invention can also be applied to various areas of technology when weaving piezoelectric sensors, to determine both the health of the electrical circuits and the presence of a mechanical connection of the piezoelectric sensors with the structural elements of the objects. A device is known for checking the drivers of sensors, which provides for remote sensing of the operability of the electrical circuits of piezo sensors 1. However, the device will not allow determining the presence of a mechanical connection of the sensors to the design of test objects. The closest to the proposed technical entity is a device for remotely controlling piezoelectric sensors installed on the test object, containing a switch, a sinusoidal signal generator, a control signal generating unit and an indicator, the switch inputs are connected to the drivers, and the output is connected to the first inputs of the unit generating a pilot signal, the second input of which is connected to a sinusoidal signal generator. The output of this unit is connected to the indicator. The health of electrical circuits is determined by the signal on the indicator caused by the response of the piezoelectric element to a change in the frequency of a sinusoidal oscillator in a certain frequency range. 2 However, the known device does not have sufficient reliability of control, as it only allows to determine the health of electrical circuits and does not provide information on the presence of mechanical connection with the design of the control object; Since the indicator responds only to changes in the parameters of the piezodatch electrical circuits, the target Fig. - expanding the functionality of the device due to the control and the presence of the mechanical connection of the piezoelectric transducers with the test object; The goal is achieved by the fact that the device for remote control of piezodasers installed on the test object, containing a switch, a sinusoidal signal generator, a control signal generating unit, the switch inputs connected to the piezo sensor, and the output signal connected to the first input of the control signal generating unit., The second input which is connected to the generator of a sinusoidal signal, a vibration measuring transducer, a switch and an amplifier are inserted, the vibration measuring transducer The transducer is installed on the object being operated with the possibility of acoustic communication with piezo sensors and connected to the indicator through a series-connected switch and amplifier, the second input of which is connected to the second output of the switch connected to the second input of the control signal generating unit. The drawing shows a block diagram of the proposed device. The device contains piezo sensors I (in quantity), switch 2, block 3 of forming a control signal, generator 4 of a sinusoidal signal, vibration measuring transducer 5, switch 6, amplifier 7, indicator 8, Piezo sensors 1 are connected through switch 2 to the first input of block 3 of forming control signal, the second input of which is connected to the generator 4 of the sinusoidal signal, the vibration measuring transducer 5 being installed on the test object with the possibility of acoustic communication with the piezoelectric sensor and connected to and cators 8 via follower | but connected yereklyuchatel amplifier 6 and 7, the second input of which is connected to the second output of switch B, a second input coupled with the output of the unit 3 forming the control signal. The device works as follows. To check the electrical circuits and remove, if necessary, the amplitude-frequency characteristics of the piezo sensor, each piezo sensor 1 ((e) is alternately connected via switch 2 to the first input of the control signal generating unit 3 to compensate for the capacitive load of the connecting circuits block 3 at the second input is recorded from the generator 4 of a sinusoidal signal operating in the fixed frequency generator mode in a certain range. The signal from the output of block 3 through the last optically connected switch 6 and amplifier 7 is fed to indicator 8, the moment of balance of the circuit is determined by the minimum signal of indicator 8, then the frequency of generator 4 is gradually changed in a certain frequency range.With good electrical circuits, a sharp increase in signal level is observed on indicator 8 caused by the imbalance of compensation in block 3. There are no signal changes in case of faulty sensor circuits. To check the mechanical connection of the piezoelectric transducers with the design of the test object, the switch is made b th block, thus be connected to the second input of the amplifier vibro31068728 -4

measuring transducer 5 ion control piezo sensors, so

disconnecting the communication of blocks 3 and 6. Prikak provides a check for correcting the frequency of the oscillator of 4 counters as electrical circuits of sensors,

There is a change in the signal on the indicator and the presence of a mechanical connection

Torus 8, Violation of mechaicic sensor with object construction

Hey piezoelectric transducers with a design test. The device is universal,

leads to no signaling changes as it can be applied for

la The test operation is performed by piezoelectric sensors having an arbitrary

next with all piezo sensors. Number of measurement axes. The Invention device provides twice the .10 frequency characteristics of the piezo sensor more than the high reliability of the distance. provides clear amplitude

Claims (1)

DEVICE FOR REMOTE CONTROL OF Piezosensors installed on the test object, comprising a switch, a sinusoidal signal generator, a control signal generating unit and an indicator, the switch inputs being connected to piezoelectric sensors, and the output connected to the first input of the control signal generating unit, the second input of which is connected with a sinusoidal signal generator, characterized in that, in order to expand the functionality of the device by controlling the mechanical connection of the piezoelectric sensor with the test object, a vibration measuring transducer, a switch and an amplifier are introduced into it, the vibration measuring transducer being installed on the test object with the possibility of acoustic communication with piezoelectric sensors and connected to the indicator through a series-connected switch and amplifier, the second input of which is connected to the second output of the switch, connected <g connected to the second input with the output of the control signal generating unit.