SK8653Y1 - Method and apparatus for contactless sensing of mechanical quantities - Google Patents

Abstract

The method of contactless sensing of mechanical quantities, in particular of force or pressure, is based on the fact that the electromagnetic field around the resilient electrical circuit body (1) of the resonant electrical circuit (2) is excited by the high frequency electrical signal supplied through the directional member (4) to the emitter (5). The elastic body (1) of the mechanical member with the resonant electrical circuit (2) is subjected to mechanical action, whereby the electromagnetic field emitted by the emitter (5) is affected by the resonant electrical circuit (2), which is influenced by the mechanical quantity to the resilient body (1) the mechanical member changes its resonant frequency, causing a reflection of the electromagnetic wave advancing back to the emitter (5). Based on the calculated resonant frequency of the resonant electrical circuit (2), the value of the non-electrical physical quantity acting on the mechanical member is determined in the evaluation / control circuit (6). The device for contactless sensing of mechanical quantities, in particular of force or pressure, consists of a high-frequency generator (3) connected via a directional member (4) to an electromagnetic field emitter (5) located near the resilient body member (1) of the mechanical sensor member (1) electric circuit (2). The electromagnetic emitter (5) is connected via a directional member (4) to a control / evaluation circuit (6) which is coupled to the high frequency generator (3).

Description

Technical field

The technical solution relates to a method and apparatus for contactless sensing of mechanical quantities, in particular force and pressure. The technical solution belongs to the field of electrical engineering, measurement, metrology and theory of electromagnetic fields.

BACKGROUND OF THE INVENTION

Known methods of sensing mechanical quantities usually utilize the sensing of deformation on a resilient body caused mainly by force or pressure. Standard methods of sensing are based on the use of transducers based on strain gauges or on the basis of magnetostrictive resp. piezoelectric effect. The output of such a converter is an electromotive voltage, which contains information about the measured non-electric physical quantity. The non-contact sensing methods do not utilize direct electrical contact with the sensor deformation member, wherein the deformations are sensed using an opto-electric, capacitive, and inductive principle, allowing the deformation member to move freely and sensing from greater distances from the load. In optoelectronic methods, it is possible to mention the optical fiber deformation sensing, the measurement of small deformations in the middle of the image sensing and its subsequent processing, or the known principles of laser distance measurement. The disadvantage of using optoelectronic sensing methods is the requirement for suitable lighting conditions. The capacitive and inductive principle of sensing uses a change of the distance of the plates (bodies), the characteristic quantity changes clearly. The specific disadvantages of the materials used are a clear disadvantage of these methods of measurement. All of the above methods use transducers for electrical voltage or current, where there is the disadvantage that the voltage is an easily influenced variable from the outside environment, thereby affecting to some extent the accuracy of the measured non-electric physical variable.

The above-mentioned shortcomings have provided, in part or in full, the possibility of solving this problem by suitable technical means with the aim of contactlessly sensing mechanical quantities, in particular force and pressure, i. j. without the electrical connection of the sensing element on the body of the action or action only through the evaluated changes in the electromagnetic field formed around the body of action. As a result of this effort, a method and apparatus for contactless sensing of mechanical quantities according to the present utility model are described.

The essence of the technical solution

The essence of the technical solution is a new method of non-contact sensing of mechanical quantities, especially force or pressure, and a device for this purpose Ak. The electromagnetic field is most affected when the frequency of the electromagnetic field is close to the resonant frequency of the resonant electric circuit. magnetic wave. The reflected electromagnetic wave is redirected by the directional element to the evaluation / control circuit. A high frequency generator is also transmitted to the evaluation / control circuit. The evaluation / control circuit evaluates the frequency at which the electromagnetic field and the resonant electric circuit interact most and calculates the resonant frequency of the resonant electric circuit. If the resonant electronic circuit is part of the resilient body of the mechanical member, which due to the mechanical magnitude of the grain, its shape and resonance of the resonant electric circuit, the resonant frequency of the resonant electric circuit, and The source of the electromagnetic field is the high-frequency voltage generated in the high-frequency generator and passing directly through the directional element to the radiator.

A method for contactless sensing of mechanical quantities, in particular force or pressure, may be operated on a device for contactless sensing of mechanical quantities, in particular force or pressure, characterized in that it consists of a high-frequency generator connected via The resonant electrical circuit is closed. The electromagnetic field emitter is connected via a directional element to the advantages of a nocturnal / control circuit which is still connected to a high frequency generator.

The advantages of the method and the device for contactless sensing of mechanical quantities, in particular of force and pressure, according to this technical solution are advantageous from the effects which are manifested externally. In general, con

With K 8653 Υ1 it is argued that the originality of the solution is that this method does not require any electrical contact connection of the resonant electrical circuit to minimize measurement errors. The electromechanical physical quantity is converted to frequency. Frequency is the most accurately measurable quantity of. SI units. In this way, they minimize the sources of errors in sensing the mechanical quantity and its evaluation. The proposed technical solution uses a change in the properties of the electromagnetic field for the measurement of non-electric physical quantities.

BRIEF DESCRIPTION OF THE DRAWINGS

The attached figure is a diagram of contactless sensing of mechanical quantities and devices for this purpose

Examples of isotriation

The individual embodiments of the invention are presented for illustration and not as limitations of the technical solutions. Those skilled in the art will find or will be able to rely upon using no more than routine experimentation many equivalents to specific embodiments of the invention. Such equivalents will also fall within the scope of the following protection claims.

It is not difficult for those skilled in the art to optimally design the wiring and select the appropriate elements, so these features have not been addressed in detail.

Example 1

The method of contactless sensing of mechanical quantities, in particular force or pressure, is characterized by this. The electromagnetic field in the vicinity of the resilient body 1 of the mechanical member subjected to mechanical action, in which the resonant electrical circuit 2 is closed, is influenced by the radiator 5 by means of the radiator 5 by means of the radiofrequency generator 3 generated here in the radiofrequency generator. 1. The resonant electric tn circuit 2 of the mechanical member changes its resonant frequency, which affects the electromagnetic sweat generated by the radiator 5, causing reflection of the electromagnetic wave passing back into the radiator 5. The rebound electromagnetic wave from the radiator 5 through the directional member 4 and the high-frequency electric the signal from the high-frequency generator 3 is fed to the evaluation / control circuit 6. The tuning of the high-frequency generator 3 achieves the greatest interaction between the electromagnetic field and the resonant electric circuit. 2. The evaluation control circuit 6 evaluates the frequency at which the most significant interaction between the electromagnetic field and the resonant electric circuit 2 occurs and calculates the resonant frequency of the resonant electric circuit 2. On the basis of the calculated resonant frequency of the resonant electric circuit 2, the non-electric physical variable applied to mechanically ^- member.

Example 2

The apparatus for contactless sensing of mechanical quantities, in particular force or pressure, operating according to the method of Example 1, consists of a high-frequency generator 3 connected via a directional member 4 to an electromagnetic field radiator 5 disposed around the resilient body of the mechanical sensor member. The emitter 5 of the electromagnetic field is connected via a directional member 4 to the evaluator / control circuit 6, which is connected to a high-frequency generator 3.

Industrial usability

The method and apparatus for contactless sensing of mechanical quantities can be used in industries where precision non-electrical physical quantities such as robotics, mechanical devices, precision engineering, machine tools, precision measuring machines and instruments are required.

Claims (2)

C O C IIR A N U CLAIMS A method of contactless sninian of non-peculiar variables, in particular force or pressure, characterized in that a high-frequency electric signal is generated by a high-frequency generator (3), which is supplied via a directional member (4) to a radiator (5). the electromagnetic field around the resilient body (1) of the resonant electric circuit (2) is energized when the resilient body (1) of the resilient electric circuit (2) is subjected to mechanical action, the electromagnetic field generated by the radiator (5); ) is influenced by the resonant electrical circuit (2); influencing the resonant frequency of the resonant frequency of the mechanical element on the resilient body (1) of the resonant electric circuit (2) to influence the electromagnetic field generated by the radiator (5), thereby causing reflection of the electromagnetic wave advancing back into the radiator (5); a backscattered electromagnetic wave from the emitter (5) is fed to the evaluation / control circuit (6) via a directional member (4) and a high frequency electrical signal from the high frequency generator (3); prefciďovaní the high-frequency generator (3) is evaluated by the frequency of vovyhodnocovacom ^t riadiacomobvode (6), which achieves the greatest interaction much tektrornagnetického electric field resonance obvodont (2) and the calculated resonance frequency of a resonant electrical circuit (2); based on the calculated resonant frequency of the resonant electric circuit (2), the non-electric physical value is determined in the evaluation / control circuit (6); quantities acting on the mechanical member. 2. Apparatus for contactless sensing of mechanical quantities, in particular net or pressure, from a device. The apparatus comprises a radio frequency generator (3) coupled via a directional pricing (4) to an electromagnetic field radiator (5) disposed around a resilient body (1) of a mechanical sensor member having a closed resonant electrical circuit (2); in this case, the emitter (5) of the electromagnetic field is fed via a directional price (4) to the evaluation / control circuit (6), which is connected to a high-frequency generator (3).