Road vehicle detection system by use of fiber sensing

Abstract

The invention discloses a road vehicle detection system by use of fiber sensing. The system comprises a fiber sensing system and a signal processing system. The fiber sensing system comprises a laser. The emission optical path of the laser is provided with a first coupler for introducing laser to two fibers; the rail ends of the two fibers are connected with a second coupler; one output path of the second coupler is provided with a first photoelectric detector; and the other output path is provided with a second photoelectric detector. The signal processing system comprises a difference amplifier connected with the output ends of the first photoelectric detector and the second photoelectric detector. The output of the difference amplifier is connected with a band pass filter; the output of the band pass filter is connected with a DSP module through an AD converter; the output of the difference amplifier and a reference voltage are inputted into a comparator together; and the output of the comparator is also connected with the DSP module. The system provided by the invention employs fibers as sensing devices so that the stability is better, the life is longer, and the system is rarely affected by external factors.

Description

[0001] technical field [0002] The invention relates to the technical field of vehicle information detection, in particular to a road vehicle detection system using optical fiber sensing. Background technique [0003] With the development of the economy, the number of automobiles in our country is increasing rapidly, and the road traffic management involves more and more factors, which is facing great pressure. Especially in terms of vehicle detection, at present, the ground coil method is mostly used, the induction coil is buried underground, and the vehicle passing through the ground is sensed, and whether there is a vehicle passing by is judged according to the induction signal received by the signal processing end. Judging information such as the load capacity of the vehicle. However, since the coil is buried underground, it is often under pressure, which will cause deformation of the coil itself for a long time, affecting the measurement effect. Contents of the inve...

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Problems solved by technology

However, since the coil is buried underground, it is often under pressure, which will cause deformation of the coil itself for a long time and affect the measurement effect.

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