Singlechip-based low-frequency weak signal detector

A weak signal and weak signal amplification technology, applied in the field of signal processing, can solve the problems of high hardware requirements of weak signal detectors, high signal-to-noise ratio threshold of weak signals, and difficult maintenance, etc., and achieves good human-computer interaction and easy debugging. and maintenance, easy maintenance effect

Inactive Publication Date: 2011-10-12
BEIHANG UNIV
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Problems solved by technology

However, these methods have certain limitations, mainly in the relatively high SNR threshold value of the weak signal that can be detected
And the w

Method used

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  • Singlechip-based low-frequency weak signal detector
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  • Singlechip-based low-frequency weak signal detector

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Embodiment Construction

[0032] specific implementation plan

[0033] like figure 1 As shown, it is a complete structural block diagram of the present invention, including a weak signal amplification and preprocessing part and a digital processing part.

[0034] The weak signal amplification and preprocessing part includes: input filter module, buffer processing module, pre-amplification module, high-pass filter module, low-pass filter module, 50HZ notch filter and post-processing module. The unprocessed low-frequency weak signal first enters the input filter module for RFI interference purification processing; then it is sent to the buffer processing module to reduce the correlation between the pre-stage circuit and the subsequent amplification circuit; after buffer processing, the signal enters the pre-amplification module, Amplify the microvolt level signal to the millivolt level signal; since the capacitor DC blocking is not introduced before the first stage amplification, in order to prevent the...

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Abstract

The invention discloses a singlechip-based low-frequency weak signal detector, which comprises two parts, namely a front end of an amplification and preprocessing circuit for weak signals, and a rear end of a digital processing part, wherein the amplification and preprocessing part comprises an input filtering module, a buffer processing module, a preamplifier module, a high-pass filtering module, a low-pass filtering module, a 50HZ notch filter and a post-processing module; the front-end part detects low-frequency weak signals under high-noise background and transmits the signals to the rearend part for digital processing; the rear-end digital processing part comprises an analog/digital (A/D) sampling module, a singlechip module, a storage module and a wireless transmission module; and the rear-end part performs signal acquisition, fast Fourier transform (FFT) analysis and wireless transmission on the input signals, and more intuitively and clearly recognizes the signals. The detector can simply and rapidly detect the low-frequency weak signals and is low in cost.

Description

technical field [0001] The invention relates to a low-frequency weak signal detector based on a single-chip microcomputer, which can be used in the fields of optics, electricity, magnetism, acoustics, mechanics, medicine, materials, etc., and belongs to the field of signal processing. Background technique [0002] With the rapid development of science and technology and production, it is necessary to measure small changes in physical quantities. For example: weak voltage or current, weak light and so on. Especially the measurement of weak signals under extreme conditions has become the basis for deepening the understanding of nature, developing new materials and creating new devices. [0003] Generally speaking, many non-electrical small changes can be converted into electrical signals through sensors and then amplified, displayed or recorded. Since the electrical signal converted by these tiny changes through the sensor is very weak, it may be 10 -6 V, 10 -7 V is even 1...

Claims

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Application Information

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IPC IPC(8): G01D21/00
Inventor 王俊万冬冬袁运能栾军
Owner BEIHANG UNIV
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