SU987374A1 - Device for measuring linear displacements - Google Patents

Description

one

The design refers to the technique of measuring and can be used to measure displacements and other physical quantities that are converted to linear displacement.

Measuring devices are known that contain an interchange sensor and a processing unit for measuring information.

The disadvantages of the known devices are the narrow measurement range and the laboriousness of changing the operating range.

The closest to the invention to the technical essence is a device for measuring linear displacements, containing a transfer pedal, an external converter, a power source connected to the converter power winding, and a registrar.

however, the device lacks: precisely a wide range and low measurement accuracy.

The purpose of the invention is to expand the measuring range and to cover the accuracy.

The goal is achieved by the fact that the device for measuring

linear displacement, containing a transformer primary converter, a power source connected to the converter power winding, and a recorder, are equipped with series-connected leak-width and phase modulators, the first input of which is connected to the output of the power source, and a differential amplifier, the first input of which is connected to the output the transformer primary converter winding, the second input is connected to the output of the phase modulator, and the output is connected to the recorder's input.

In addition, the amplitude modulator is designed as a discretely controlled voltage divider.

Moreover, the phase modulator is made

20 in the form of parallel-connected resistors and a varicap, and a converter code — a voltage whose output is connected to one of the varicap electrodes.

FIG. 1 is a block diagram of a device for measuring linear displacements} in FIG. 2 is a phase modulator diagram.

The device contains a source of 1 30 Power, transformer primary

displacement transducer 2, whose power supply is connected to source 1, amplitude modulator input connected to source 1, phase modulator 4, the input of which is connected to the output of amplitude modulator 3, differential amplifier 5, the first input of which is connected to the output winding of converter 2, and the second to the output of the phase modulator 4, and the recorder b, the input of which is connected to the output of the amplifier 5. The phase modulator 4 can be made in the form of parallel-connected resistors 7 and varicap 8, and the converter 9 code-example ix, whose output is connected to one of electrodes of the varicap 8.

The device works in the following way;

From the power source 1, a sinusoidal voltage is supplied to the power winding of the converter 2, which is also fed to the input of the amplitude modulator 3. The control parameter (for example, pressure P) converted into the movement of the converter 2 working body causes a change in the amplitude and signal phase output winding, which is fed to the first input of the differential amplifier 5. To the second input of the Amplifier 5, a signal is output from the output of the phase modulator 4, made, for example, in the form of a parallel connected resistor 7 and a vario apa 8, and converter 9 code-voltage,

Phase modulator 4 changes the phase of the reference signal from the output of the amplitude modulator 3, which can be made as a discretely controlled divider, correcting the amplitude of the reference signal by changing the capacitance of the varicap 8 from the signal from the output of the converter 9-code. received from the output of the power source 1. The output signal from amplifier 5, the phase of which carries information about the magnitude of the measured displacement, goes to recorder 6, which converts the phase of the output signal of the amplifier to a digital code.

The slope of the characteristics and the operating range of the device are determined by the transmission coefficient of the amplitude modulator 3, while in the phase modulator the working point is offset from a change in the transmission coefficient of the amplitude modulator. Each measurement range is associated with a pair of numbers in the form of a digital code supplied to the control inputs, respectively, on the light 3 and phase 4 modulators, to determine the transmission gain of the amplitude modulator 3 and the phase correction value of the phase modulator 4.

Thus, in order to change the measurement range, it is necessary to feed pre-selected pairs of numbers as a digital code to the control inputs of the modulators 3 and 4.

The invention allows to expand the range and improve the accuracy of measuring the 5 NIN linear displacements.

Claims (3)

Invention Formula 1 A device for measuring linear displacements containing a transformer primary converter, a power source connected to the converter power winding, and Recorder, characterized in that, in order to expand the measuring range and increase accuracy, it is equipped with series-connected amplitude and phase modulators, the input of the first of which connected to the output of the power source, and a differential amplifier, the first input of which is connected to the output winding of the transformer primary converter, the second input to the output of the phase modulator, and the output connected to the input of the recorder. 2. The device according to claim 1, characterized by the fact that the amplitude modulator is made in the form of a discretely controlled voltage divider. 3. The device according to claim 1, wherein the phase modulator is in the form of a parallel-connected resistor and varicap, and a code-voltage converter, the output of which is connected to one of the varicap electrodes. Sources of information taken into account in the examination 1. Electric measurements of non-electric quantities. Ed. Novitsky P.V. L., Energie, 1975, p. 475-476. 2.Vitrichenko E.A. and others. Methods of making astronomical optics. M., Science, 1980, p. 77-81 (pro-that .ip).