Laser range finding method for monitoring large bridge vibration
A technology of laser distance measurement and bridge, which is applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc. It can solve the problems of weak vibration signal, difficulty in collecting bridge vibration signal, and inability to know whether the bridge is safe, etc., so as to prevent damage The effect of chemical events
Inactive Publication Date: 2015-12-02
JIANGXI FASHION TECH
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Problems solved by technology
[0002] Existing technology: Vibration monitoring of known bridges uses vibration sensors attached to the surface of the bridge to receive vibration signals of the bridge. Due to the low vibration frequency of the bridge, generally below a few Hz, the received vibration signals are weak and are easily affected by wind noise. Such as external vibration and sound interference, it is difficult to collect the real vibration signal of the bridge, and the received signal is only the size of the relative amplitude, not the actual swing amplitude of the bridge. It is impossible to judge whether the swing of the bridge is out of range. It is also impossible to know whether the bridge is Safety
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[0026] Attached below figure 1 , 2 The present invention is described in detail:
[0027] The laser vibration collector 1.1 is fixed on the pylon of the bridge, and the internal laser is aimed at the 1.2PVC laser reflector in the middle of the bridge to emit laser light. The PVC board and the laser are kept relatively vertical. The laser vibration collector 1.1 uses the phase method for distance measurement, and the laser transmitter The 1016-R laser of Mitsubishi is used, and the detector adopts GT-102 silicon PIN photoelectric tube. The transmitting part adopts direct light modulation, and the 40Mhz signal is directly superimposed to modulate the laser. In this way, one optical ruler can be generated at a time, and the length of the optical ruler is :
[0028] The length of the optical ruler is L=1 / 2(C / F1)
[0029] L: the length of the ruler
[0030] C: is the speed of light
[0031] F1: frequency 40MHZ for laser modulation
[0032] Get L=3.75 meters
[0033] Because ...
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The invention relates to a laser range finding method for monitoring large bridge vibration, belonging to the civil engineering field, and applied to the structure safety and health monitoring industry. The method employs laser range finding sensors installed at relatively stationary positions such as bridge towers to perform dynamic range finding on the surface of a large bridge; when the large bridge vibrates and shakes, the distance among the sensors changes relatively; the positions such as the bridge towers are relatively stable, and accordingly vibrate much less than a bridge floor; the laser range finding sensors dynamically test the distance change between a bridge body and the bridge floor to obtain the vibration frequency and amplitude of the bridge floor; and the change period is the vibration frequency of the large bridge. The shaking amplitude of the large bridge can be obtained according to the swing data of the large bridge; and according to the shaking amplitude and frequency, safe states of the large bridge can be timely obtained.
Description
technical field [0001] The invention relates to a method for monitoring the vibration of a bridge by laser ranging, which belongs to the field of civil engineering and is applied to the structural safety and health monitoring industry. Background technique [0002] Existing technology: Vibration monitoring of known bridges uses vibration sensors attached to the surface of the bridge to receive vibration signals of the bridge. Due to the low vibration frequency of the bridge, generally below a few Hz, the received vibration signals are weak and are easily affected by wind noise. Such as external vibration and sound interference, it is difficult to collect the real vibration signal of the bridge, and the received signal is only the size of the relative amplitude, not the actual swing amplitude of the bridge. It is impossible to judge whether the swing of the bridge is out of range. It is also impossible to know whether the bridge is Safety. Contents of the invention [0003...
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IPC IPC(8): G01H9/00
Inventor 徐帆王辅宋刘文峰刘国勇李松陈志官何妍妍谢镇
Owner JIANGXI FASHION TECH