SU1263995A1 - Displacement-to-electric signal sample converter - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to increase the reliability and expand the conversion range. The converter includes a housing in which a spherical matrix of ferromagnetic material oscillates between the electrodes in a dielectric medium. On the outer side of the electrodes there are magnets with conical poles, moving along the electrodes under the influence of the input signal. Because Since the interelectrode region is made with a variable gap in length, the frequency of the output signal C S varies depending on the position of the magnets, indicating the amount of movement of the rod. 2 Il. (L

Description

The invention relates to measuring technique and can be used to convert linear displacements into a pulsed electrical signal.

The purpose of the invention is to increase reliability and expand the conversion range.

In FIG. 1 shows the design of the converter; in FIG. 2 electric circuit.

The transducer into a pulse signal contains electrodes 1 and 2, an electrically conductive spherical particle 3 made of ferromagnetic material, permanent magnets with conical poles 4 and 5, a conversion circuit with a resistor 6.

The electrodes 1 and 2 (Fig. 1) are mounted in the housing 7 and are located at an angle to one another. The interelectrode space through the nozzle 8 is filled with a dielectric medium - a liquid non-polar dielectric, for example hexane, and a spherical particle having a density equal to the density of a non-polar dielectric is made by galvanic coating of a nickel layer on a sphere made of foamed polystyrene.

Permanent magnets 4 and 5 are mounted on the frame 9 with the possibility of regulation. the distance between the conical poles, and the transfer of mechanical displacements from the measurement object to the permanent magnets is carried out through the measuring rod 10, mounted with a flange 11 and racks 12 on the frame 9, which is mounted on ball bearings 13, moving along the guides in the housing 7. Power circuit between the rod 10 and the surface of the element whose movements are measured, is provided by the spring 14.

A constant voltage source 15 is connected to the electrodes 1 and 2 through a resistor 6 (Fig. 2), and a digital frequency counter 16 is used to register the output signals, which together with elements 6 and 15 makes up a conversion circuit.

The device operates as follows.

When voltage is applied to the electrodes 1 and 2 in the interelectrode space, an electric field of intensity

U _

2h · -tg "· / £’ "(1) where (Z is the angle formed by electrodes 1 and 2;

h is the distance from the top of the corner.

This electric field causes the spherical particle 3 to oscillate between the electrodes. Oscillations of the particle are accompanied by over 20

I where the charge pulses and frequency pulses are formed on the charge nose and on resistor 6

(2) ξ is the dielectric constant of the interelectrode space ;, • r is the radius of a spherical particle ;, ²⁵ p is the average density of the particle;

K is the recovery coefficient upon impact of a spherical particle on the electrodes.

Since particle 3 is made of a ferromagnetic material (nickel), under the influence of the magnetic field of the conical poles of the permanent magnets 4 and 5, it oscillates between the electrodes along axis AA (Fig. 1).

A controlled linear movement transmitted through the measuring rod leads to a change in the position of the conical poles of the permanent magnets relative to the diverging electrodes. In this case, an inhomogeneous magnetic field carries along the oscillating particle 3 and changes its trajectory of oscillations h with respect to the apex of the angle of about.

This leads, according to formula (2), to a change in the repetition rate f of electrical pulses at the output of the converter, which is recorded by a recording device, for example, a digital frequency meter.

The use of an inhomogeneous magnetostatic field acting on a particle of ferromagnetic material that performs continuous 55 oscillations in a system of electrodes with a variable gap makes it possible to obtain a design that is simple to manufacture and set up, in which there are no unreliable and complex parts for attaching the feat :. .yh: · .. of K-genera and the particle itself. The possibility of profiling the interelectrode gap makes it possible to obtain a linear scale in the entire 5th range, and the implementation of a particle with zero buoyancy eliminates the influence on the measurement results of slopes, vibrations and accelerations.

Claims (1)

The invention relates to a measurement technique and can be used to convert linear displacements into a pulsed electrical signal. The purpose of the invention is to increase the reliability and expand the conversion range. FIG. 1 shows the transducer design; in fig. 2 electrical circuit. A transducer into a pulse signal contains electrodes 1 and 2, an electrically conductive spherical particle 3 made of ferromagnetic material, permanent magnets with conic poles 4 and 5, a conversion circuit with a resistor 6. Electrodes 1 and 2 (Fig. 1) are mounted in housing 7 and are angled to one another. The interelectrode space through fitting 8 is filled with a dielectric medium — a non-polar dielectric, such as hexane, and a spherical particle having a density equal to that of a non-polar dielectric, is made by electroplating a layer of nickel onto a sphere from foamed polystyrene. The permanent magnets 4 and 5 are mounted on the frame 9 with the possibility of adjusting the distance between the conical poles, and the transfer of mechanical movements from the measurement object to the permanent magnets is carried out through the measuring rod 10 reinforced with the help of a flange 11 and pillars 12 on the frame 9, which mounted on ball bearings 13, interchangeably with guides in housing 7. Power connection 3 between rod 10 and surface of element, displacements of which are measured, is provided by spring 14, to electrodes 1 and 2 through resistor 6 (Fig. 2) connect ene source of DC electric voltage 15, and the CPU register output signals applied digital frequency meter 16 which together with elements 6 and 15 is conversion circuit. The device works as follows. When voltage is applied to electrodes 1 and 2, an electric field of 2h4g о arises in the interelectrode space (./ 2 where oi is the angle formed by electrodes 1 and 2; h is the distance from the top of yi лаla "; the field causes the spherical particle 3 to oscillate between the electrodes. The oscillations of the particle are accompanied by charge transfer and current pulses of the frequency eti + K) 2h.t3 |. | rphO-kll3f are formed on the resistor 6 where S is the dielectric constant of the electrode space; , radius of a spherical particle ;, average particle density; coefficient of recovery upon the impact of a spherical particle on the electrodes. Since the particle1 3 is made of ferromagnetic material (nickel), then under the action of the magnetic field of the conic poles of the permanent magnets 4 and 5, it oscillates between the electrodes along the axis A – A (Fig. 1). The controlled linear movement transmitted through the measuring rod causes a change in the position of the conical poles of the permanent magnets relative to the diverging electrodes. In this case, the inhomogeneous magnetic field carries away the oscillating particle 3 and changes its vibration path h relative to the vertex of the angle and. This leads, according to formula (2), to a change in the frequency f of the following electrical pulses at the output of the converter, which is recorded by a recording device, such as a digital frequency meter. The use of a non-uniform magnetostatic field acting on a particle made of ferromagnetic material, performing continuous oscillations in a system of electrodes with a variable gap, makes it possible to obtain an easy-to-manufacture and adjusting structure that does not have unreliable and complicated parts for fastening SUBVII.7: them; species and the particle itself. The ability to profile the interelectrode gap allows a linear scale to be obtained over the entire range, and the execution of a particle with zero buoyancy eliminates the effect on the measurement results of the slope of vibrations and accelerations. Claims of Invention A displacement transducer into a pulsed electrical signal containing a sealed enclosure, a dielectric sealed medium connected to a conversion circuit, mounted inside an electrodynamic housing with an electrically conductive spherical particle placed in the interelectrode region, and measuring rod, characterized in that and expansion of the conversion range, permanent magnets are installed in it, the interelectrode region is made in the form of a profiled channel formed Gloss electrodes with variable gap along the length, located in the inhomogeneous magnetic field conical poles of permanent magnets coupled to izmeriteLnan rod and the walls of the housing, and electrically conductive particle made of a ferromagnetic mate rial. Aa FIG.