SU1359654A1 - Variable-induction-capacitance linear displacement transducer - Google Patents

Abstract

The invention relates to a measurement technique that can be used to measure linear movements of objects. The purpose of the invention is to simplify the design by using the core of the inductor as the electrode of the measuring capacitor. A linear capacitive transducer of linear displacements contains a ferromagnetic core with an inductance coil located on it and measles connected in the process of measurements with a controlled object. The core and the measles simultaneously perform the functions of the electrodes of the measuring cone, the variable capacitance capacitor, which is connected together with the inductance coil to the resonant measuring circuit. When the core moves, there is a change in the inductance of the coil, the capacitance and the electrical capacitance of the measuring capacitor, which leads to a disturbance of the resonance, the measuring circuit, recorded with the help of the indicator, 3 AST. f-ly, 4 silt S

Description

The invention relates to a measurement technique and can be used to measure linear movements of objects.

The purpose of the invention is to simplify the design by using a magnetic core as one of the electrodes of a capacitive sensor and increasing sensitivity.

FIG. 1 schematically shows a capacitive capacitive linear transducer, general view; Figs 2-4 are embodiments of the magnetic core and the core of the converter.

Inductive-capacitive linear displacement transducer contains a ferromagnetic core 1 with inductor 2 located on it and measles 3, interacting with a controlled object 4 during measurement. Inductive transducer sensor is formed by inductor 2 placed on core 1 and core 3. Capacitive sensor is formed the core 3, performing simultaneously the functions of one of the electrodes of the capacitive sensor, and the ferromagnetic core 1, performing the role of the other electrode. To increase sensitivity, inductive and capacitive sensors are included in the resonant measuring circuit 5 to which indicator 6 is connected. Tripod 7 can be used to mount the converter. To prevent electrical closure, core 1 and measles 3 are insulated from one another, for example, covered with an insulating film or varnish. The anchor 3 can be made in the form of a rod (Fig 2) mounted to move inside the ferromagnetic core 1. By increasing the area of mutual overlapping of the core 1 of core 1 when moving the core, the sensitivity of both capacitive and inductive sensors increases, and therefore total converter as a whole. Even more sensitivity of the capacitive sensor can be increased if the core 1 and the measles 3 are provided with an electric wire with 1 plate 8 and 9 (Fig. 3) fixed to the ends.

The greatest increase in the sensitivity of the capacitive sensor can be achieved by performing the ends

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 core 1 and core 3 in the form of opposite-located combs 10 and 11 (Fig. 4).

Inductive-capacitive converter operates as follows.

In some initial position of the core 3 relative to the core 1, the tuning of the resonant measuring circuit is made. When the core 3 is displaced from the initial position due to a change in, for example, the size of the object to be monitored 4, the inductance of the coil 2 and the capacitance of the sensor formed by the core 1 and the core 3 simultaneously change, which leads to a detuning of the resonant measuring circuit registered with the indicator 6 Depending on the type of resonant circuit used, the output parameter may be frequency, voltage, current.

The use of a ferromagnetic core as an electrode of a capacitive sensor simplifies the design of the converter, since it makes the introduction of additional structural elements unnecessary.

Claims (4)

1. Inductive-capacitive linear displacement transducer, containing an inductive sensor included in the resonant measuring circuit, made in the form of a core and ferromagnetic core with an inductance coil placed on it, and a capacitive sensor as one of the electrodes, which used Measuring the inductive sensor, characterized in that, in order to simplify the design, the ferromagnetic core of the inductive dates is used as the second electrode of the capacitive sensor ika. 2. The transducer according to claim 1, characterized in that, in order to increase the sensitivity, the measles is made in the form of a rod mounted for movement within a ferromagnetic core. 3. A converter according to claims 1 and 2, characterized in that it is provided with two electrically conductive plates fixed at the ends of the core and core. 4. Preoo; the beneficiary according to claim 1 is distinguished by the fact that, in order to increase the sensitivity, the torso of hearts facing one another are 1359654  - The shaft and the core are each made in the form of a comb of flat plates placed in the gaps between the plates of an opposedly placed bed. R sri.ch Compiled by L „Guskov Editor E.Sligach Tehred I.Popovich Proofreader A.Znmokos Order 6145/43 Circulation 677 Subscription VNIIPI State Kog-shteta USSR according to inventions and discoveries 113035, Moscow-, Zh-355 Raushsk nab, d. 4/5 Production and printing company, Uzhgorod, st. Project s srivl