CN103794057A - Road vehicle detection system by use of fiber sensing - Google Patents
Road vehicle detection system by use of fiber sensing Download PDFInfo
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- CN103794057A CN103794057A CN201210432917.XA CN201210432917A CN103794057A CN 103794057 A CN103794057 A CN 103794057A CN 201210432917 A CN201210432917 A CN 201210432917A CN 103794057 A CN103794057 A CN 103794057A
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- optical fiber
- fiber sensing
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- Optical Radar Systems And Details Thereof (AREA)
- Length Measuring Devices By Optical Means (AREA)
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
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Technical field
The present invention relates to information of vehicles detection technique field, particularly a kind of road vehicle detection system of utilizing Fibre Optical Sensor.
Background technology
Along with economic development, China's automobile pollution rapidly goes up, and the factor that control of traffic and road relates to is also more and more, is faced with significant stress.Especially vehicle detection aspect, the ground coil method that adopt, are embedded in inductive coil underground more at present, the vehicle that induction ground is passed through, the induced signal of receiving according to signal end for process has judged whether vehicle process, further, can also judge the information such as the dead weight capacity of car according to the intensity of signal.But because coil is embedded in undergroundly, often pressurized, can cause coil itself to be out of shape for a long time, affects measurement effect.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of road vehicle detection system of utilizing Fibre Optical Sensor, have reliable and stable, the feature of long service life.
To achieve these goals, the technical solution used in the present invention is:
A kind of road vehicle detection system of utilizing Fibre Optical Sensor, comprise optical fiber sensing system and signal processing system, described optical fiber sensing system comprises laser instrument, in laser instrument transmitting light path, being provided with coupling mechanism one introduces laser on two-way optical fiber, this two-way optical fiber connector connects coupling mechanism two, in coupling mechanism Er mono-tunnel output, photodetector one is set, in another road output, photodetector two is set; Described signal processing system comprises the differential amplifier that connects photodetector one and photodetector two output terminals, the output tape splicing bandpass filter of differential amplifier, the output of bandpass filter connects DSP module by AD converter, the output of differential amplifier inputs to comparer together with reference voltage, and the output of comparer also connects DSP module.
Compared with prior art, the present invention uses optical fiber as perception device, and stability is better, and the life-span is longer, not affected by extraneous factor.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is carried out to more detailed explanation.
As shown in the figure, the present invention is a kind of road vehicle detection system of utilizing Fibre Optical Sensor, comprise optical fiber sensing system and signal processing system, described optical fiber sensing system comprises laser instrument, in laser instrument transmitting light path, being provided with coupling mechanism one introduces laser on two-way optical fiber, this two-way optical fiber connector connects coupling mechanism two, in coupling mechanism Er mono-tunnel output, photodetector one is set, and in another road output, photodetector two is set; Described signal processing system comprises the differential amplifier that connects photodetector one and photodetector two output terminals, the output tape splicing bandpass filter of differential amplifier, the output of bandpass filter connects DSP module by AD converter, the output of differential amplifier inputs to comparer together with reference voltage, and the output of comparer also connects DSP module.
Principle of work of the present invention is:
Optical fiber cable is embedded under road surface, when vehicle is through out-of-date, produce vibration, the length and the refractive index that cause optical fiber change, correspondingly its output intensity also can change, two photodetectors receive after this light intensity, are further analyzed processing in signal processing system, obtain the integrated information of vehicle.
Claims (1)
1. one kind is utilized the road vehicle detection system of Fibre Optical Sensor, comprise optical fiber sensing system and signal processing system, it is characterized in that, described optical fiber sensing system comprises laser instrument, in laser instrument transmitting light path, being provided with coupling mechanism one introduces laser on two-way optical fiber, this two-way optical fiber connector connects coupling mechanism two, in coupling mechanism Er mono-tunnel output, photodetector one is set, and in another road output, photodetector two is set; Described signal processing system comprises the differential amplifier that connects photodetector one and photodetector two output terminals, the output tape splicing bandpass filter of differential amplifier, the output of bandpass filter connects DSP module by AD converter, the output of differential amplifier inputs to comparer together with reference voltage, and the output of comparer also connects DSP module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210432917.XA CN103794057A (en) | 2012-11-03 | 2012-11-03 | Road vehicle detection system by use of fiber sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210432917.XA CN103794057A (en) | 2012-11-03 | 2012-11-03 | Road vehicle detection system by use of fiber sensing |
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| Publication Number | Publication Date |
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| CN103794057A true CN103794057A (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210432917.XA Pending CN103794057A (en) | 2012-11-03 | 2012-11-03 | Road vehicle detection system by use of fiber sensing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104700624A (en) * | 2015-03-16 | 2015-06-10 | 电子科技大学 | Traffic flow online monitoring system and method based on phase-sensitive optical time domain reflectometer |
| CN105467188A (en) * | 2014-09-05 | 2016-04-06 | 易能乾元（北京）电力科技有限公司 | All-fiber current sensor adopting segmented light path fault diagnosis |
-
2012
- 2012-11-03 CN CN201210432917.XA patent/CN103794057A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467188A (en) * | 2014-09-05 | 2016-04-06 | 易能乾元（北京）电力科技有限公司 | All-fiber current sensor adopting segmented light path fault diagnosis |
| CN105467188B (en) * | 2014-09-05 | 2018-09-14 | 马鞍山万兆科技有限公司 | A kind of all-fiber current sensor using segmented light path fault diagnosis |
| CN104700624A (en) * | 2015-03-16 | 2015-06-10 | 电子科技大学 | Traffic flow online monitoring system and method based on phase-sensitive optical time domain reflectometer |
| CN104700624B (en) * | 2015-03-16 | 2017-07-07 | 电子科技大学 | The monitoring method of the vehicle flowrate on-line monitoring system based on phase sensitivity optical time domain reflectometer |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20140514 |