SU1497458A1 - Interference-type vibration laser meter - Google Patents

Abstract

The invention relates to a measuring technique and can be used in transferring the size of units in the process of checking the means of measuring parameters of oscillations on model vibration settings. The purpose of the invention is to increase the reliability of measurements by eliminating non-informative spectral components. This is achieved by converting the optical signal by the photodiode of interferometer 1 into an electrical signal, which determines the oscillation parameters and displays on the digital indicator 6. At the same time, the oscillation harmonics of the object are measured by the meter 9 and the comparison circuit 10 is compared with the threshold value 14 set by the switch 14. If the measured harmonic coefficient is greater than or equal to the threshold, then the inverter 12 blocks the indication of the measurement results, and the circuit 13 produces an indication of the prohibition of measurements. If the harmonic coefficient is less than the threshold, then the vibration parameters are measured and the measurement results are displayed on the digital indicator 6. 1 sludge.

Description

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The invention relates to a measuring technique and can be used in transferring the size of units in the process of checking the means of measuring parameters of oscillations on model vibration settings.

The aim of the invention is to increase the reliability of measurements by eliminating non-informative spectral components.

The drawing shows the scheme of the device. ; The device contains an interferometer

IC with a corner reflector, connecting-; with the object, successively connected transducer 2 photodiode pulses, an indication counter 3, a storage register 4, a decoder 5 and a digital indicator 6, a transducer input, a pad 2 connected to the photodiode output of the interferometer 1 , inverter generator frequency converter 7, the output of which is connected to the second input of memory register 4, sequentially connected vibration converter 8, harmonic coefficient meter 9, comparison circuit 10, circuit

IIs, inverter 12 and circuit

13 of the measurement prohibition indication, the switch 14 of the allowable values of the cosmic harmonic harmonic connected to the second input of the comparison circuit 10. The second output of the converter 7 is often-; The excitation generator is connected to the second input of the matching circuit 11, the second output of the inverter 12 is connected to the second input of the display 3, the vibration transducer 8 is connected to the object.

The device works as follows.

The optical signal is converted by the photodiode of the interferometer 1 into a signal that is an alternation of the maxima and minima of the current with a period corresponding to the displacement of the reflector by half the radiation wavelength. After the converter 2 photodiode pulses into the counting voltage pulses, the rectangular pulses corresponding to the maxima of the photocurrent are divided into twelve and fed to the input of the counter 3 indications

The pulses corresponding to the vibration frequency of the vibrating table produced by the transducer 7 of the frequency of the excitation generator, to the input of which comes from the generator from the generator of the vibrating table exciter, are divided into nineteenteen and fed to the coincidence circuit 11. Vibrations of the vibrating table are converted by the vibrator 8 into a proportional electric signal fed to the input of the harmonic coefficient meter 9, which measures the harmonic coefficient, converts its value to a binary-decimal code and feeds to one of the inputs of the comparison circuit 10, and 10 comparisons are supplied from the switch 14 with the allowable values of the binary-decimal code of the given (allowable) harmonic coefficient values, set by the operator. The two codes are compared with the comparison circuit 10 and, if they match, or the actual value of the harmonic coefficient of the oscillatory process exceeds the allowable values, then the output of the comparison circuit 10 appears: a signal that goes to one of the inputs of the coincidence circuit 11. At the simultaneous appearance of a signal at the second input of the coincidence circuit 11 from the output of the converter 7 frequency of the excitation generator, a signal appears at the output of the coincidence circuit 11, which, having passed through the inverter 12, from one output goes to the second input of the indication counter 3 and closes it, leads to zeroing of the indication on the digital indicator 6, and from another output of the inverter 12, the signal is supplied, and at the same time the measurement indication indication circuit 13 is turned on. The indication of the measurement results is not osug (it is established until either the harmonic coefficient is reduced to the values below the allowable values, or a new, higher allowable value of the factor coefficient € is set on the switchboard 14; nta harmonics.

Claims (1)

Invention Formula An interference type laser vibration meter containing an interferometer with a corner reflector associated with an object, a pulse converter connected in series, an indication counter, a storage register, a decrypter 1tor and a digital indicator, a frequency converter of the excitation generator, the output of which is connected to the input of the memory register, input The pulse converter is connected to the interferometer photodiode output, characterized in that, in order to increase the measurement accuracy, it is equipped with a follower but connected by a vibration transducer, a harmonic coefficient meter, a comparison circuit with a measurement prohibition indication circuit, a switch of permissible harmonic coefficient values, the output of which is connected to the second input of the comparison circuit, the output of the excitation generator frequency converter is connected to the second input of matches, the output of the inverter is connected to the second input coincidence circuit, inverter of the display counter.