LC passive wireless two-parameter sensing system based on PT symmetry

Abstract

The invention provides an LC passive wireless two-parameter sensing device based on PT symmetry. The sensing device comprises an LC two-parameter sensor (2) and a reading circuit (1); the LC two-parameter sensor (2) and the reading circuit (1) carry out energy coupling and signal transmission through inductive coupling; the control circuit (3) controls the reading circuit (1). A single-chip microcomputer in the control circuit can detect whether the voltage amplitude and the frequency meet a PT symmetrical state or not, namely whether the voltage amplitude reaches the maximum or not and whether the frequency is divided or not, an adjustable capacitor is adjusted in a stepping mode till the system reaches the PT symmetrical state, and then detected parameters are detected by detecting a frequency value and a negative resistance value of the system. The device is simple in structure, can detect two parameters, saves the space, and reduces the cost.

Description

technical field [0001] The invention relates to LC sensor technology, in particular to a PT (space inversion transformation-time inversion transformation) symmetrical LC (inductance-capacitance) passive wireless dual-parameter sensing system, which belongs to the technical field of measurement and testing. Background technique [0002] Since the LC passive wireless sensor was first proposed in 1967, it has been widely used in various occasions, such as the detection of parameters such as pressure, temperature, humidity, rotational speed, and gas. The traditional LC sensor is usually composed of a sensitive capacitor and a spiral inductor in series. Its working principle is very simple: the sensitive capacitor of the LC sensor changes with the change of the measured parameter, which causes the resonant frequency of the LC resonant circuit to change. Place a sensor outside the sensor The readout coil, the readout coil is coupled with the sensor inductance, by analyzing the inp...

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The purpose of the invention is to address the above-mentioned deficiencies in the background technology and provide a PT symmetry-based LC passive wireless dual-parameter sensing system, which uses the principle of PT symmetry to realize the measurement of LC dual parameters and realizes dual The automatic real-time PT symmetrical matching of parameter detection improves the readout distance and sensitivity of LC dual-parameter measurement, and solves the problems of traditional passive wireless LC sensor with single measurement parameter, complex readout system and signal detection distance change

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