SU1502966A1 - Device for measuring vibratory displacement - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to improve the performance of measurements by providing the possibility of reliable measurements over a time equal to a quarter of a period. The vibration displacement meter contains a vibrator 1, excited by a generator 6. The movable table of the vibrator 1 is connected to a displacement sensor 12, which has low inertia and accurately tracks the movement of the table, having a zero phase shift relative to it. The signal from the displacement sensor 12 is fed to the input of the timer 11, which is started from the decision block 9. Timer 11 generates a rectangular pulse with a duration equal to a quarter of the oscillation period of the vibrator 1, which opens the key 8. Signal from the photodetector 4 located at the interferometer output 2, through the converter 3 and the key 8 enters the counter 7, where the pulses are summed. The amplitude (A) of the oscillations of the vibrator table 1 for a quarter period is calculated in the decision block 9 by the formula A = (λ / 2) ^. N, where λ is the interferometer laser radiation wavelength 2, N is the number of pulses accumulated in the counter 7. 2 Il.

Description

(21) 4181325 / 24-28

(22) 12/04/86

(46) 08.23.89. Bul No. 31

(71) Department of the All-Union Scientific Research and Development Institute of Current Sources of the Kvant Scientific Production Association with Experimental Production in Sevastopol

(72) I.A. Pashanin

(53) 531.7 (088.8)

(56) -Authorial certificate of the USSR 1293496, cl. G 01 H 9/00, 1984.

(54) MEASURING VIBRATING METER (57) The invention relates to a measurement technique. The aim of the invention is to improve the performance of measurements by providing the possibility of reliable measurements over a time equal to a quarter of a period. The vibration displacement meter contains a vibrator 1, excited by a generator 6. The movable table of the vibrator 1 is connected to a displacement sensor 12, which has low inertia and accurately tracks the movement of the table, having a zero phase shift relative to it. The signal from the displacement sensor 12 is fed to the input of the timer I, which is started from the decision block 9. Timer 11 generates a rectangular pulse with a duration equal to one quarter of the oscillation period of the vibrator 1, which opens the key 8. Signal from the photodetector 4 located at the output of the interferometer 2, through the converter 3 and the key 8 enters the counter 7, where the pulses are summed. The amplitude (A) of the oscillations of the vibrator table 1 for a quarter of a period is calculated in the decision block, 9 using the formula A () N, where A is the laser emission wavelength of the interferometer 2, N is the number of pulses accumulated in the counter 7. 2 or

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The invention relates to measurement technology and can be used to calibrate vibration transducers, with

The aim of the invention is to improve the performance of measurements by providing the possibility of reliable measurements over a time equal to a quarter of a period,

FIG. 1 shows a block diagram of a meter; in fig. 2 - timing charts of the device.

The vibro-displacement meter contains a vibrator 1, an inter- ferometer 2, a movable mirror of which is mounted on a vibrator 1, a transducer 3 located at the output of the interferometer 2, a photodetector 4, the output of which is connected to the converter 3 the input of the vibrator 1, the generator 6, the output of which is connected to the input of the amplifier 5, the counter 7, 25 key 8, the first input of which is connected to the output of the converter 3, the output to the first input of the counter 7, the decisive block 9, the trigger 10, t The timer 11, the output of which is connected to the second input 30 of the key 8 and the first input of the trigger 10, the second input of which is connected to the second output of the decision block 9 and the second input of the counter 7, the output to the second input of the decision block 9, the first jj whose output connected to the first input of the timer 11, the first input to the output of the counter 7, the displacement sensor 12, the output of which is connected to the second input of the timer 11, the input 40 to the movable column of the vibrator 1, the timer is configured for automatic adjustment.

The meter works as follows. D5

The signal from generator 6 (Fig. 2,1) is fed to amplifier 5 and from it to vibration converter 1, the movable table of which is connected to displacement sensor 12. The latter has a small one. inertia and accurately tracks the movement of the table and has a zero phase shift relative to it, the movement of the table of the vibrator 1 always has a phase shift relative to, the signal from the generator output 6,

As the displacement sensor 12, for example, a mechotron can be used.

The signal from displacement sensor 12 (Fig. 2.2) is fed to the input of timer 11, which is started from the final block 9. Timer 11 generates a rectangular pulse. (FIG. 2.5) with a duration equal to the duration of a quarter of the oscillation period of the vibration transducer 1, which is supplied to the key 8, the signal from the photodetector 4 (FIG. 2.3) passes through the transducer 3 (FIG. 2.4) and goes to another input of the key 8 which is open during the operation of the pulse of timer 11. And at this time the pulses corresponding to the maxima of the photocurrent arrive at the counter-.7 (Fig. 2.6).

The pulse of timer 11 by the falling edge sets the trigger 10 to 1, and this signal goes to decision block 9, which begins to read information from counter 7. Before the measurement starts, output 7 of the decision block 9 resets counter 7 and sets trigger 10 to O.

The amplitude of the oscillation of the table of the vibrator 1 for a quarter of a peri-h ode is calculated in the decision block 9 by multiplying the number of pulses per half dpin, the laser radiation wave

A.N,

where A is the oscillation amplitude, µm;

 - laser radiation wavelength, μ;

N is the number of pulses, and on the indicator of the decision block 9, the amplitude of the oscillations is highlighted in micrometers.

Thus, the introduction of a displacement sensor associated with a movable vibrating transducer platform and a timer eliminates the presence of a phase shift between the pulse gate signal and the signal from the laser interferometer photodetector and allows measuring the amplitude of the oscillation in a quarter of the oscillation period in the presence of a phase shift between signal generator and the movement of the platform vibrator and gives a reliable result about the amplitude of oscillations, reduces the measurement time from the period

up to a quarter of the period, which improves performance.

Claims (1)

Invention Formula Vibration displacement meter, containing a vibration transducer, an interferometer whose movable mirror is attached to a vibration transducer, a photodetector at the output of the interferometer SHPPPPPSPPPPPPPPPP Editor H, Rogulich FIG 2 Compiled by S. Konyukhov Tehred M.Lndyk Order 5076/52 Circulation 511 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., 4/5 key, counter and decision block, trigger, timer, the input of which is connected to the second key input and first trigger input, the first timer input is connected to the first output of the decision block, the second output of which is connected to the second inputs of the trigger and counter, the second input of the decision block is connected trigger code, characterized in that, in order to increase the measurement performance, it is equipped with a displacement sensor, the timer is designed as an automatically tunable timer, the sensor output is connected to the second timer input, and the input is from a movable table vibroconverter. lmp innn Proofreader N. King Subscription