Non-phase-sensitive digital demodulation system and method applied to LVDT displacement sensor

Abstract

The present invention discloses a non-phase-sensitive digital demodulation system and method applied to an LVDT displacement sensor. The system comprises a pre-processing circuit for carrying out signal conditioning and analog-to-digital conversion processing on the original signal outputted by a secondary coil and obtaining a corresponding pre-processing signal, a signal filtering circuit for filtering the noise signal and / or high-frequency component in the pre-processing signal and correspondingly obtaining the DC component comprising displacement information, and an information processor for mapping the DC component by using a preset mapping database and obtaining the iron core displacement information corresponding to the DC component. The non-phase-sensitive digital demodulation system disclosed in the invention does not have any association with a phase in the process of signal demodulation processing, thus the influence on measurement precision of an iron core displacement amount by phase jitter is eliminated, and the measurement precision of the iron core displacement amount is improved.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a non-phase-sensitive digital demodulation system and method applied to LVDT displacement sensors. Background technique [0002] LVDT displacement sensor (LVDT, Linear Variable Differential Transformer, linear variable differential transformer) is a widely used displacement sensor, which has many advantages such as simple structure, long life and wide linear range. [0003] The signal demodulation method used in the existing LVDT displacement sensor is usually to perform phase-sensitive detection on the signals output by the two secondary coils in the LVDT displacement sensor, and then use the phase-sensitive detection result to determine the iron core in the LVDT displacement sensor. displacement. However, in the actual application process, due to circuit characteristics and other reasons, the phase of the output signal may jitter, resulting in that the phase-sensitive detectio...

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Problems solved by technology

However, in the actual application process, due to circuit characteristics and other reasons, the phase of the output signal may jitter, resulting in that the phase-sensitive detection result cannot reflect the real core displacement, resulting in the final measured core displacement. big error

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