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GMI sensor based on detector amplification principle

A sensor and principle technology, applied in the field of sensors, can solve the problems of unstable and reliable measurement, center frequency change, signal distortion, etc., and achieve the effect of avoiding design difficulties, avoiding signal distortion, and good temperature

Inactive Publication Date: 2019-05-07
NAT UNIV OF DEFENSE TECH
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  • Description
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  • Application Information

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Problems solved by technology

At this time, a slight change in environmental factors such as temperature and power supply voltage will bring about a change in the center frequency of the front notch filter, resulting in signal distortion or even circuit saturation, making it impossible to perform stable and reliable measurements

Method used

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  • GMI sensor based on detector amplification principle

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as figure 1 Shown, the GMI sensor based on the detection amplification principle of the present invention includes:

[0029] GMI probe signal input channel, used as a signal channel for GMI probe signal input;

[0030] Reference signal input channel, used as a reference channel for reference signal input;

[0031] The phase-sensitive detection unit multiplies the GMI probe signal output by the GMI probe signal input channel and the control signal coherent with the measured signal output by the reference signal input channel, and then outputs it through a low-pass filter;

[0032] The DC amplifier amplifies the signal processed by the phase-sensitive detection unit and outputs it.

[0033] In a specific application example, in the GMI probe signal input channel, the magnetic field signal detected by the GMI probe is a lo...

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Abstract

The invention discloses a GMI sensor based on a detector amplification principle. The GMI sensor based on the detector amplification principle comprises a GMI probe signal input channel, a reference signal input channel, a phase-sensitive detection unit and a direct-current amplifier; the GMI probe signal input channel is used as a signal channel for GMI probe signal input; the reference signal input channel is used as a reference channel for reference signal input; the phase-sensitive detection unit is used for multiplying a GMI probe signal output by the GMI probe signal input channel by a control signal output by the reference signal input channel and related to a detected signal, and outputting through a low-pass filter; and the direct-current amplifier is used for outputting after amplifying the signal processed by the phase-sensitive detection unit. The GMI sensor based on the detector amplification principle disclosed by the invention has the advantages of being steady in performance and low in noise influence, capable of providing reliable data and the like.

Description

technical field [0001] The invention mainly relates to the technical field of sensors, in particular to a GMI sensor based on the principle of detection and amplification. Background technique [0002] Using the giant magneto-impedance effect (GMI) of amorphous silk materials to detect weak biomagnetic fields has been proven to be a new type of high-sensitivity detection method. In the post-conditioning of the signal, since the useful signal is very weak relative to the noise in the environment, in order to obtain a high enough resolution, the GMI sensor needs to increase the signal-to-noise ratio as much as possible, that is, reduce the environmental noise and amplify the useful signal, while the environmental noise The most important component comes from the power frequency interference of 50Hz and its multiplier. [0003] Since the advent of detection amplification, it has shown excellent performance in weak signal detection. The main ideas are as follows: 1. Use a modul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/09
Inventor 韩长林周宗潭徐明唐景昇肖军浩
Owner NAT UNIV OF DEFENSE TECH
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