SU1610235A1 - Arrangement for measuring distance to surface - Google Patents

Abstract

The invention relates to an instrumentation technique and can be used to measure short distances to the surface that wears during friction. The purpose of the invention is to increase accuracy by increasing the sensitivity. For this, the device uses a sinusoidal voltage generator 1 with stabilized frequency and amplitude, a resonant filter consisting of a block of 3 reactive elements and an inductive sensor 2, and a block 4 of recording. The resonance frequency of block 3 is chosen to be equal to the frequency of the generator 1, determined, in turn, in accordance with the boundary frequency of the sensor core material. As a result of frequency drift of the resonant filter with a change in the distance to the surface, there is a sharp change in the amplitude measured by block 4. 1 Il.

Description

The invention relates to an instrumentation technique and can be used to measure a small distance to the surface that wears during friction.

The purpose of the invention is to improve the accuracy by increasing the sensitivity when using as a transfer function of the decay section of the amplitude-frequency characteristic of a high-quality filter tuned to a frequency equal to the limiting frequency of the sensor's magnetic core material,

The drawing shows a block diagram

devices that

The device comprises a generator 1, an inductive sensor 2, a block of 3 reactive elements and a block 4 of registration. The output of the generator 1 through the block 3 reactive elements connected to the input of the block 4 registration. Sensor 2 sets the resonant frequency of the block 3 of reactive elements.

The device works as follows.

The generator 1 produces a sinusoidal voltage stabilized in amplitude and frequency, which is fed to the input of a band-pass filter formed by the inductance of sensor 2 together with a block of 3 reactive elements. Sensor 2 is installed at some distance from the test sample, and the band-pass filter, in whose frequency-setting circuit the sensor inductance is turned on, is tuned to resonance with the frequency of the generator 1 signal. The signal from the filter output is fed to the input of the recording unit 4. When changing the position of the test sample relative to sensor 2, the inductance

the coil of the latter is changed, this leads to the departure of the resonant frequency of the bandpass filter and a sharp decrease in the amplitude of the signal at its output,

5The use of the device allows high-resolution recording of linear wear of the tested friction pairs and can be used in mechanical engineering and repair production for

10 assessments of workability, wear resistance, and as a means of diagnosing new and restored worn parts and interfaces of internal combustion engines and other equipment.

Claims (1)

The invention The device for measuring the distance to the surface, containing a generator, an inductive sensor, a block of reactive elements, the output of the generator is connected to the first input of a block of reactive elements, the output of which is connected to the input of a recording unit, the output of an inductive sensor is different the fact that, in order to increase the accuracy, the generator is designed as a generator of sinusoidal oscillations, stabilized in frequency and amplitude, the inductive sensor is made in the form inductor coils, the conclusions of which are the output of the sensor, with an open magnetic circuit, the limiting frequency of the material of which corresponds to the frequency of the generator, and the block of reactive elements is designed as a high-quality band-pass filter tuned to the frequency of the generator; .