SU1305538A1 - Device for measuring small gaps between two surfaces - Google Patents

Abstract

This invention relates to instrumentation technology. The aim of the invention is to improve measurement accuracy by registering intermediate values of the gap and calibrating it. A device containing a linearly increasing voltage generator and a oscilloscope) allows, by calibrating the change in the gap and monitoring it using oscilloscope readings, to record the real value of the gap and calibrate its intermediate values. 1 il.

Description

The invention relates to instrumentation engineering and can be used to measure small gaps between two surfaces, in particular, to establish an initial 5 gap between the magnetic head and the disk surface and to calibrate the gaps.

The purpose of the invention is to improve the measurement accuracy by registering intermediate values of the gap and its calibration.

The drawing shows a diagram of the device.

The device contains optically coupled light source 1, a beam splitter 2, a light filter 3 and a photodetector 4, a recorder in the form of an oscilloscope 5. The gap is formed by a transparent surface 6 and opaque 7, which is

(five

Oscillograms on the oscilloscope screen, that is, the number of transitions of the light beam from minimum to maximum, are observed on piezovibrator 8. Then the voltage of the power source 9 is changed, i.e. change the amplitude of the displacements (to the vibrations) of the piezo vibrator 8. The oscilloscope screen records intermediate values of the gap and the moment of contact of the surfaces 6 and 7. At the time of contact of these surfaces decrease the amplitude of the vibrations of the piezo vibrator 8 and calibrate the intermediate values of the gap according to the change magnitude values of the amplitude.

Since the magnitudes of the displacement (oscillations) of a piezovibrator 8 with an opaque surface are precisely calibrated by

It is driven with a piezo-vibrator 8 connected to the parameters of the source 9

power supply 9 in the form of a linearly increasing voltage generator. Piezo vibrator 8 is mounted for movement along the incident beam direction by means of a displacement unit consisting of two wedges 10 and 11 mounted on rails 12, the lower wedge 11 is kinematically connected with the micrometric screw 13.

The device works as follows.

When the micrometer screw 13 is rotated, the wedge 10 moves in directions 25

thirty

power supply (voltage), then using the oscilloscope 5 and the known wavelength transmitted by the light filter, you can specify the value of the gap and obtain its real value, and so calculate its intermediate values

Claims (1)

Invention Formula A device for measuring small gaps between two surfaces, one of which is transparent, containing an optically coupled light source, a beam splitter, a light filter, and a photo sensor 12 piezovibrator 8 and the surface 35 emnik, piezovibrator, connected with 40 7 enters the zone of the measured gap. The light flux emitted by the light source 1 passes through the beam splitter 2 and is directed to the gap formed by surfaces 6 and 7. The interfering rays reflected by these surfaces by beam splitter 2 are directed through the light filter 3, which passes light of a certain frequency to the input of the photothermal 4, signals from which are supplied to the oscilloscope 5. With the help of the power supply 9, a voltage is applied on piezovibrator 8 and watch waveforms on the oscilloscope screen, i.e. the number of transitions of the light beam from the minimum to the maximum. Then the voltage of the power source 9 is changed, i.e. change the amplitude of the displacements (oscillations) of the piezo vibrator 8. On the oscilloscope screen, record the intermediate values of the gap and the moment of contact of the surfaces 6 and 7. At the time of contact of these surfaces reduce the amplitude of the displacements (oscillations) of the piezo vibrator 8 and calibrate the intermediate values of the gap according to the change in the values of the amplitudes. Since the magnitudes of the displacement (oscillation) of the piezovibrator 8 with an opaque surface are precisely calibrated by adjustable source parameters 9 power supply (voltage), then using the oscilloscope 5 and the known wavelength transmitted by the light filter, you can specify the value of the gap and get its real value, as well as calculate its intermediate values. Invention Formula A device for measuring small gaps between two surfaces, one of which is transparent, containing an optically coupled light source, a beam splitter, a light filter, and a photodot an opaque surface, a power source connected to a piezo-vibrator, and a recorder, characterized in that, in order to improve accuracy, it is equipped with a block of displacements in the form of two conjugate wedges intended for mechanical movement of the piezovibrator, the power supply is made in the form of a linear-linear generator increasing voltage, and the recorder - in the form of an oscilloscope connected to a photodetector. Editor P.Geershi Order 1420/39 Circulation 678 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Compiled by E.Glazkova TehredL.Serdyukova Proofreader M.Sambors a