System and method for extracting bridge dynamic parameters based on laser Doppler

A technology of laser Doppler and dynamic parameters, applied in the direction of measuring devices, instruments, etc., can solve problems such as difficult to measure the low-speed movement of bridge structures, achieve the requirements of reducing hardware computing power, high extraction accuracy, and reduce costs

Active Publication Date: 2017-04-12
CHINA RAILWAY BRIDGE SCI RES INST LTD +1
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Problems solved by technology

For engineering structures moving at low speeds such as bridges, it is difficult for the current laser Doppler signal processing system to extract the dynamic parameters in the measurement signal. s, even 100m / s~0.1mm / s measurement

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  • System and method for extracting bridge dynamic parameters based on laser Doppler
  • System and method for extracting bridge dynamic parameters based on laser Doppler
  • System and method for extracting bridge dynamic parameters based on laser Doppler

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Embodiment Construction

[0045] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0046] An embodiment of the present invention provides a laser Doppler-based bridge dynamic parameter extraction system, the system comprising:

[0047] The photodetector 12 is used for detecting photoelectric signals.

[0048] The high-frequency signal collector 13 is used to collect photoelectric signals of a certain length in the photodetector and convert them into voltage values ​​to obtain discrete sequences of photoelectric signals.

[0049] The calculation and processing module is used to perform fast Fourier transform on the discrete sequence of the photoelectric signal to obtain the frequency motion sequence; to find the specific position of the photoelectric signal corresponding to the peak value of the frequency motion sequence to obtain the frequency subdivision interval; to further refine the frequency subdivision interval Calcula...

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Abstract

The invention discloses a dynamic bridge parameter extracting system and a dynamic bridge parameter extracting method based on laser Doppler and relates to the technical field of bridge detection. The dynamic bridge parameter extracting method includes the steps of S1, collecting photoelectric signals of a photoelectric detector by a high-frequency signal collector, and converting the photoelectric signals into voltage values to obtain a photoelectric signal discrete sequence ; S2, by the aid of a computer, subjecting the photoelectric signal discrete sequence to fast Fourier transform so as to obtain a frequency movement sequence, seeking the specific position of the photoelectric signal corresponding to a peak value of the frequency movement sequence, subjecting a frequency-subdivided interval to further subdivision to compute a frequency spectrum within the frequency-subdivided interval, seeking the specific position of the photoelectric signal corresponding to a peak value of a frequency spectrum sequence, and computing a Doppler frequency shift; S3, computing moving speed of an object; S4, judging whether vibrating frequency of the object needs to be computed or not; S5, computing the vibrating frequency of the object according to a speed sequence. The dynamic bridge parameter extracting system and the dynamic bridge parameter extracting method based on the laser Doppler are high in extracting precision and used for measuring the low moving speed and the vibrating frequency of an engineering structure like a bridge.

Description

technical field [0001] The invention relates to the technical field of bridge detection, in particular to a system and method for extracting bridge dynamic parameters based on laser Doppler. Background technique [0002] In recent years, sensor technology for bridge dynamic detection has developed vigorously, including acceleration sensors based on the principles of semiconductor material piezoresistive effect and material piezoelectric effect, but they are basically contact sensors. The disadvantages of contact sensors are great. The installation of contact sensors is time-consuming and labor-intensive, and will cause varying degrees of damage to the bridge structure, and will hinder on-site traffic after installation. The above-mentioned disadvantages can be solved by using non-contact bridge dynamic detection technology, among which, the velocimeter based on laser Doppler principle is a typical representative of non-contact dynamic detection technology. The velocimeter b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/02
Inventor 王翔汪正兴汪双炎王波柴小鹏伊建军马长飞荆国强刘鹏飞王艳芬高阳张华兵
Owner CHINA RAILWAY BRIDGE SCI RES INST LTD
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