SU949343A1 - Photoelectric vibration probe - Google Patents

Description

(5) PHOTOELECTRIC VIBRATION

one

The invention relates to vibrometry and p | It is designed to measure the amplitude of oscillations of objects.

A photoelectric vibro-probe is known, containing a series-connected light source, a branched light guide with an optical attachment, and a photodetector tl3.

However, the known vibro probe has a low measurement accuracy due to the dependence of the photodetector current on the distance to the measurement object and the need to go from one measurement point to another.

The purpose of the invention is to improve the measurement accuracy.

This goal is achieved by the fact that a photoelectric vibro probe containing a series-connected light source, a branched light guide with an optical cap and a photodetector, is provided with series-connected differentiator, input connected to the photodetector, amplifier, time selection unit and recorder and series-connected reference level unit, comparator, second the input of which is connected to the differentiator and the pulse shaper, the output of which is connected to the second input of the block, times selection, and connected to the second output of the comparator zone indicator.

The drawing shows a block diagram of a photoelectric vibrating probe.

The vibro probe contains a photo detector 1, to the output of which are connected serially connected differentiator 2, amplifier 3, time section block k and recorder 5. The vibro probe is equipped with a reference level unit 6 sequentially connected, the comparator 7 having a second input connected to the output of differentiator 2 and a driver 8 pulses Vy3E

the stroke of which is connected to the second input of the time selection block, and connected to the second output of the comparator 7 by zone indicator 9,

The device works as follows.

The signal from the output of the photodetector 1, containing a constant and variable components, is fed to the differentiator 2.

The variable signal component from the output of differentiator 2 passes through the amplifier 3 to the time selection unit 4. The constant component of the output of the differentiator 2 and the constant voltage from the block 6 of the reference level, corresponding to the optimal distance to the object, go to the comparator 7. When the voltages on both inputs are equal, the comparator 7 generates a signal that arrives at the indicator 9 for signaling zones that the working distance is found, and through the shaper 8 pulses per block 4 of the time selection, opens it. and. information about the object's oscillations arrives at the registrar 5.

The use of the proposed method will improve the measurement accuracy of the transition from one measuring point of an object to another.

by quickly finding the working point of the converter and automatically recording information at this moment. .

Claims (1)

Invention Formula A photoelectric vibro probe containing a series-connected light source, a branched light guide with an optical nozzle and a photodetector, characterized in that, in order to improve measurement accuracy, it is equipped with a series-connected differentiator, input connected to the photodetector, amplifier, time selection unit and recorder and sequentially connected by a reference level unit, a comparator, the second input of which is connected to the differentiator, and a pulse shaper, the output of which is connected to about the second input of the time selection unit, and the zone indicator connected to the second output of the comparator. Sources of information taken into account in the examination J. U.S. Patent No. ZEAOH, Cl, G 02 B 5/16, 1976 (prototype).