Demodulating device of linear variable differential transformer, and soft demodulating method thereof

Abstract

The invention relates to a demodulating device of linear variable differential transformer, and a soft demodulating method thereof. The demodulating device comprises a computer for producing an excitation voltage signal and computing stroke of a measured device; an analog output acquisition card for providing a required excitation voltage signal to a LVDT (Linear Variable Differential Transformer); a sine wave power amplifier for amplifying the excitation voltage signal output by the analog output acquisition card; the LVDT for producing a sinusoidal voltage signal when the iron core follows the measured device to move back and forth; and an analog input acquisition card for collecting the sinusoidal voltage signal output by the LVDT. The demodulating device adopts the LVDT signal soft demodulating technology and corresponding hardware control software, so that the demodulating device adapts to the parameter variation of the LVDT. Therefore, the soft control of a test is realized, and the maintenance cost and the time for manufacturing the demodulating device are saved.

Description

technical field [0001] The invention belongs to the technical field of electrical measurement and control, and in particular relates to a demodulation device and a soft demodulation method of a linear variable differential transformer. Background technique [0002] The linear variable differential transformer (hereinafter referred to as LVDT) is a sensor for detecting displacement. In practice, it can be used to detect the stroke of the hydraulic actuator of the engine vector nozzle. Proper mechanical connection can measure the stroke of the actuator, and its output signal is two sets of AC signals with the same frequency and opposite amplitude changes, which are used to indicate the stroke and direction of the action, but this signal needs to be demodulated and converted into a standard The signal can be used by the following data acquisition circuit or digital instrument. The demodulation of LVDT usually uses a special circuit, such as the LVDT signal demodulation device ...

AI Technical Summary

Problems solved by technology

The demodulation of LVDT usually uses a special circuit, such as the LVDT signal demodulation device based on the AD598 chip, but one demodulation device can only be applied to LVDT with one parameter, and the engine vector nozzle is in the development stage. , the parameters change, so that the test controller needs to be modified frequently to adapt to the changes, which requires continuous increase in follow-up maintenance costs and affects the test progress

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