SU375540A1 - PRIMARY MEASURING CONVERTER - Google Patents

Description

one

The invention relates to electromagnetic information retrieval means and is selective and can be widely used in electromagnetic devices designed to control the quality of metal products, in devices for measuring displacements and vibrations.

Primary transducers are known that contain inductively coupled circuits that interact with a controlled object by means of an intermediate mechanical element or directly when a controlled object is introduced into a magnetic field excited by said coils in the environment.

However, the sensitivity of such transducers in some cases is insufficient due to the high level of the unbalanced component of the output signal of the transducer.

The purpose of the invention is to reduce the level of the unbalanced component to zero and increase the sensitivity of said primary transducers. For this, the proposed converter is equipped with quadrupoles of RC elements included between the circuits. To increase accuracy, C-elements are adjustable.

FIG. 1, 2, 3, and 4 are variants of circuit solutions for measuring transducers.

The circuits (Figs. 1, 2, 3) contain inductively inserted coils / and 2 and a quadrupole connected between them with 3 / C-elements, and the circuit (Fig. 4) contains inductive coupled coils 1, 2, 3 and four-terminal 4 and 5 s / s-elements.

Coils / and 2 are placed one inside the other or at some distance from each other and interact with the test object as pass-through or overhead sensors, as well as placed on magnetic cores,

the form and dimensions of which are chosen depending on the tasks and parameters of the control object.

The zero balance conditions of the measuring transducers depend on the frequency of the supply voltage and the ratios of the values of the / C-elements. With the chosen parameters of the coils and / (C-quadrupole, zero balance occurs at the frequency at which the emf induced in the secondary coil by inductive coupling ROM is equal in amplitude and opposite in phase to the output voltage of the / C-quadriple. By changing the values of the elements of the C-quadrupole and the Nera:, 1 stree of coils can be changed

the frequency of the zero balance measuring

converter At a fixed frequency, the balaSiVvka of the measuring transducer is carried out by changing the values of the elements of the / C-two-port network.

A change in the size of the control (s) of the control leads to a change in the complex resistance of the coils and, as a result, to a disturbance of the zero balance of the measuring transducer. The output of the measuring transducer is a signal whose amplitude and phase are proportional to the changes in the measured parameter (s).

The primary measuring transducer according to the scheme {FIG. 4) It has two outputs and can be used to measure two or more dimensions. In the case of quality control of metal products, if one of the coils is combined with the exciting one, and the other is assigned to a certain distance, it can

be used for simultaneous local n integral control, or the related coil is used as a terminal sensor.

In the general case, the number of secondary coils is determined by the specific control tasks.

Subject invention

1. A primary measuring transducer containing inductively coupled circuits is distinguished by the fact that, for the purpose of newer sensitivities, it is equipped with quadripoles of C-elements connected between circuits.

2. Converter n. 1, characterized in that, in order to improve accuracy, the RC elements are adjustable.

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