Underground pipeline detection self-adaptive frequency modulation module
An underground pipeline and self-adaptive technology, applied in the field of electronic detection systems, can solve problems such as inaccurate signals, resonance frequency shifts, and undetectable signals, and achieve the effects of accelerating response speed, increasing width, and improving frequency modulation accuracy
Pending Publication Date: 2019-08-23
BEIJING UNIV OF TECH
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Problems solved by technology
Due to changes in the external environment or changes in the matching capacitance parameters in the coil and the resonant circuit, it is easy to cause the detected resonant frequency to shift, and the detected signal is inaccurate or even no signal can be detected.
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[0020] See Figure 1~2 , an adaptive frequency modulation module for underground pipeline detection formed by the cooperation of software and hardware, figure 1 In this example, the size of C19 controlled by Q1 is 10pF, the size of C20 controlled by Q3 is 30pF, the size of C21 controlled by Q5 is 50pF, the size of C22 controlled by Q7 is 70pF, the size of C23 controlled by Q9 is 90pF, and the size of Q11 The size of C24 controlled by Q13 is 110pF, the size of C25 controlled by Q13 is 130pF, the size of C27 controlled by Q15 is 150pF, and the size of C27 controlled by Q17 is 170pF. according to figure 2 The way to write software code is first to carry out a comprehensive frequency sweep, and then perform a fine frequency sweep according to the best example of the obtained signal after the comprehensive frequency sweep is completed. For example, when the signal obtained in the fifth case is the best, set Q1 to 1 based on the original combination, and compare it with the origi...
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The invention discloses an underground pipeline detection self-adaptive frequency modulation module, composed of an MOS transistor, a capacitor and a boost chip. The module can be used for solving theproblem of frequency incorrespondence caused by self capacitance and inductance change or self capacitance and inductance parameter change due to external environment change. The module can achieve the optimal frequency effect by using as less time as possible and using the least MOS tubes by using a coordinated combination mode of the plurality of MOS tubes. The problems of inconsistent frequency, too slow frequency retrieval, device waste and the like of a traditional signal generator and a traditional signal receiver are solved. The module solves the problem of detection frequency deviation of underground pipelines of 1.5 m and 2.4 m. The research and development cost of underground pipeline detection is greatly reduced, and meanwhile the underground pipeline detection accuracy and stability are improved.
Description
technical field [0001] The invention relates to the field of underground pipeline detection, in particular to an electronic detection system that requires extremely high frequency accuracy and weak signals. Background technique [0002] With the advancement of science and technology, the exploitation and utilization of underground resources is also increasing. However, in view of the unknown underground conditions and the lack of uniform and accurate distribution drawings of underground pipelines when laying natural gas and other pipelines underground, it has caused the current underground Circumstances that may lead to accidents when resources are exploited and utilized. The signal generator and signal receiver of the traditional underground pipeline detection system cannot reach the expected frequency due to the change of its own capacitance and inductance or the change of its own capacitance and inductance parameters due to changes in the external environment, resulting i...
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Login to View More IPC IPC(8): H03K3/011H03K17/16H03K17/687G01V3/10
CPCH03K3/011H03K17/161H03K17/687G01V3/104Y02B70/10
Inventor 耿淑琴侯宇鹏祝欣彭晓宏侯立刚张明明储孟浩周生远
Owner BEIJING UNIV OF TECH