SU1394059A1 - Device for graduating photoelectric meters of amplitude of mechanical oscillation sources - Google Patents

Abstract

The invention relates to a measuring technique and is intended for calibration of vibration amplitude meters located in difficult-to-stand places. The aim of the invention is to improve the accuracy of calibration of amplitude amplitudes of objects in hard-to-reach places due to the calibration of the device on an oscillation simulator. The shadow from the object 2 as a result of oscillations of the mirror 6 of the reflector mounted on the source 5 of the mechanical oscillations moves 10 photodetector 11 along the diaphragm 11. The reflector, made of two mirrors 6 and 7, fastened at an obtuse angle, is immobile when measured. The signal through the mirrors 4.7 and the beam splitter 3 is returned to the radiation source J, and through the photodetector 12 a Doppler signal whose frequency is proportional to the amplitude of the mirror 7. The calculated calibration factor is entered into the memory of the block 13 and displayed on the digital display 14. 1 Il. (L

Description

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four / ; The invention relates to a measuring technique and can be used with during long-term tests in mediums, with remote parameters of oscillations of large-scale abrasive articles, and in difficult access, at atix places.

The aim of the invention is to improve the accuracy of the calibration of meters; and the oscillations of the object being tested in hard-to-reach places due to the calibration of the device according to the oscillation simulator.

The drawing shows the scheme of calibration equipment.

The device contains a source of 1 1: radiation with two outputs, successively - 1; scientifically set nd to the course of the radiation U; en from the first exit for the object, 2 beam splitter 3, connected via mirror 4 with a reflector fixed on the source 5 of mechanical 1-oscillations and made of two mirrors 6 and 7, fastened under the blunt corner of IIOM. Higher results are achieved when the mirrors are fastened at an angle | J35. The base 8 of the source 5 Connected to the generator 9 power. Mirror 6 is optically connected through a diaphragm JO to a photodetector 1J, the output of which is the same as the output of receiver I2 installed on you during the emission from the second output of source 1, is electrically connected to the recording unit including the decisive unit 13 and digital display 14,

The device works as follows.

The light beam from the first exit of the source 1 is directed to a fixed object 2 of the research along its surface, which partially covers the light beam. Part of the light beam is not blocked by the object 2 of the study, falls on the beam splitter 3 and is divided into two beams. The beam passing through the beam splitter 3 falls on the mirror 6, is reflected from it, passes through the slit diaphragm 10 and falls on the photodetector P.

The beam reflected from the beam splitter 3 is sent by mirror 4 to mirror 7, i is reflected from it, from mirror 4 and from beam splitter 3 and directed back to the resonator of the laser source 1, and after passing through it, it falls on the photodetector 12, to which

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a beam of light coming from the second output of the laser source 1 also falls;

After adjustment of the optical system of the device, graduation is performed as follows. A signal is sent from the generator 9. To the source 5 of mechanical oscillations and the reflector is brought into oscillatory movements. In this case, the mirrors 6 and 7 oscillate with a certain amplitude. Object 2 is motionless. As a result of the oscillations of the mirror 6, the shadow from the object 2 of the Study moves (scans) along the slit diaphragm 10 of the photodetector 11 as if the object 2 of the study oscillated and the mirror 6 was stationary. Photodetector 1 J is used to receive an alternating signal with a voltage proportional to the amplitude of the oscillations of the mirror 6. It measures the amplitude of the oscillations of the mirror 6 with the help of the photodetector 12, a Doppler signal is taken off the output of the Iroporo, whose frequency is proportional to (the amplitude of the oscillations of the mirror 7.

Thus, when calibrating the Device, the Doppler signal with the frequency of SO, taken from the photodetector 12, the voltage Ur-, removed from the photo-receiver II, and the signal from the generator 9 with the frequency f of the source 5 oscillator are applied to the decisive unit 13 13 determines the calibration coefficient according to the following algorithm:

K, p 8-u; pf / i),, (1) where Tk is the radiation wavelength of source 1, is entered into the memory of the decision block manually.

This procedure can be performed multiple times for the required vibration parameters.

The calibration coefficient calculated by the formula (1) is entered into the memory of the decision block 13 and displayed on the digital display 14.

Claims (1)

In the process of measuring the amplitude of oscillations of object 2 of the study, the source of 5 switches and the reflector vibration is absent. Invention Formula A device for calibrating photoelectric meters of the amplitude of sources of mechanical oscillations, containing a radiation source with two: m outputs, a successively installed radiation path from the first output, a photo sensor g aperture3 I39A059 my and the photo signal detection unit of the radiation source, and the reflector, receiver, and electrically coupled with the source of the mechanical unit of registration of the photodetector, their oscillations and made of two installed during radiation from mirrors connected at an obtuse angle the second output of the source, about the tl and in such a way that one of them is opaque, in that it is purposefully connected with the photodetector with On the accuracy of the calibration, onodiafragma, and the second - with a splitter with a mirror and a successor through the first mirror, set. established by the beam splitter, flaxen during radiation reflected it is connected with the first output of the beam splitter.