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High-precision stress wave signal acquisition method and equipment

A technology of signal acquisition and stress wave, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measuring devices. It can solve the problems of low signal acquisition accuracy, low signal-to-noise ratio, and dynamic range. Small problems, to achieve the effect of reducing noise interference, improving effective accuracy, and high detection accuracy

Pending Publication Date: 2017-05-31
GUILIN UNIV OF ELECTRONIC TECH
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AI Technical Summary

Problems solved by technology

[0003] The current stress wave acquisition method and equipment have the disadvantages of low signal acquisition accuracy, low signal-to-noise ratio, and small dynamic range. The collected stress wave reflection signal is not obvious or does not appear, making it difficult to identify the reflection signal of the bolt body. The quality analysis of the bolt cannot be performed correctly

Method used

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  • High-precision stress wave signal acquisition method and equipment
  • High-precision stress wave signal acquisition method and equipment
  • High-precision stress wave signal acquisition method and equipment

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Embodiment

[0039] A high-precision stress wave signal acquisition method specifically includes the following steps:

[0040] (1) Use the excitation device to strike the anchor rod to generate a stress wave signal;

[0041] (2) Using a piezoelectric sensor to collect the stress wave signal generated by knocking;

[0042] (3) The stress wave signal enters the signal amplification circuit to amplify the signal;

[0043] (4) The amplified signal enters the low-pass filter circuit to filter out the interference signal;

[0044] (5) The output signal V of the low-pass filter circuit out4 On the one hand, it is sent to the voltage comparison circuit, and on the other hand, it is sent to the program-controlled amplifier circuit;

[0045] (6) The voltage comparison circuit compares the filtered signal with the reference voltage, and the high level or low level output after comparison is sent to the FPGA controller;

[0046] (7) The FPGA controller sends the encoded values ​​A0 and A1 to the p...

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Abstract

The invention discloses a high-precision stress wave signal acquisition method and high-precision stress wave signal acquisition equipment. The equipment comprises an exciting device, a piezoelectric sensor, a signal amplification circuit and a low-pass filter circuit, as well as a voltage comparison circuit, a programmable amplifying circuit, an A / D (analog / digital) converter and an FPGA (Field Programmable Gate Array) controller. According to the equipment, the acquired stress wave signal is amplified by using the signal amplification circuit, the amplified noise signal and external interference signal are removed by the filter circuit, the amplifier gain can be timely adjusted according to the intensity of the stress wave signal so as to perform undistorted sampling, the wide range problem of the signal is solved by using the programmable amplifying circuit, and the available accuracy of the A / D conversion is improved, so that the reflected signal is easy to recognize, and a basis can be provided for anchor bolt quality analysis.

Description

technical field [0001] The invention belongs to the technical field of stress wave signal acquisition, in particular to a high-precision stress wave signal acquisition method and equipment. Background technique [0002] As a reinforcement technology for surrounding rock, bolt support has become the preferred, safe and efficient support method for coal mine roadways. The bolt anchoring project is not only complicated, but also highly concealed. It is difficult to find quality problems and even more difficult to deal with accidents. Therefore, improving the quality and reliability of bolt detection work is conducive to ensuring the quality and safety of bolt anchoring work. At present, with the development of non-destructive testing technology, the stress wave reflection method has been widely used in the quality inspection of bolts. A small hammer is used to strike the end of the bolt to generate a stress wave, and the stress wave signal propagates horizontally along the bol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/045
Inventor 张法全冯帅王国富叶金才王小红张海如闵玉瑾
Owner GUILIN UNIV OF ELECTRONIC TECH
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