CN101813496A - Fiber Bragg grating sensor and Raman sensor-fused sensing system - Google Patents
Fiber Bragg grating sensor and Raman sensor-fused sensing system Download PDFInfo
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- CN101813496A CN101813496A CN 201010147336 CN201010147336A CN101813496A CN 101813496 A CN101813496 A CN 101813496A CN 201010147336 CN201010147336 CN 201010147336 CN 201010147336 A CN201010147336 A CN 201010147336A CN 101813496 A CN101813496 A CN 101813496A
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Abstract
The invention discloses a fiber Bragg grating sensors and Raman sensor-fused sensing system, which comprises a light source 1, a circulator 2, a plurality of fiber Bragg grating sensors 3, a wavelength division multiplexer 4, a coupler 5, a slope filter 6, a first photoelectric detector 7, a second photoelectric detector 8, a third photoelectric detector 9, a fourth photoelectric detector 10, a first divider 11, a second divider 12 and a sensing signal response processing module 13. The sensing system has the advantages that: the sensing system can simultaneously measure temperature and other multiple parameters, a group of temperature parameters are measured by Raman effect, and other parameters are measured by FBG, so monitoring points are more and the measurement system has higher precision.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, be specifically related to the sensor-based system of a kind of Fiber Bragg Grating FBG (FBG) sensor-based system and Raman sensor fusion.
Background technology
Fiber Bragg Grating FBG (FBG) is a kind of optical fiber filter that can reflect specific wavelength, and its centre wavelength can change with the variation of parameters such as the temperature of external environment, stress, pressure.According to this principle, can be by measuring the variation that the FBG wavelength change is measured the external environment physical quantity.Because FBG has plurality of advantages such as cost is low, and processing is simple, and volume is little, becomes most widely used sensor in the Fibre Optical Sensor at present.
The work live width of single FBG is very narrow, and can only measure a parameter at every turn, and many reference amounts are measured if desired, just needs a plurality of FBG, and this has a strong impact on the capacity of FBG.Therefore how to improve the capacity of FBG, making temperature and other parameters to measure simultaneously is a urgency pendent again difficult problem to be solved.
The Raman scattering effect of optical fiber is the intrinsic specific character of optical fiber itself, and the scattering effect of optical fiber is familiar with by people for a long time, and along with to the deepening continuously of its research, its application prospect more and more is subjected to paying close attention to widely.Utilize the distributed fiberoptic sensor of Raman scattering effect development, long service life, fibre loss is little, and processes easily and lay.
Based on above analysis, if can get up above-mentioned both fusions, this will solve FBG sensor temperature and other parameters while problems of measurement greatly, can realize the detection of multiple spot in engineering.
Summary of the invention
Problem to be solved by this invention is: how a kind of sensor-based system that merges optical fiber Bragg grating sensing and Raman sensor is provided, and this sensor-based system can realize that temperature and other parameters detect simultaneously.
Technical matters proposed by the invention is to solve like this: a kind of sensor-based system that merges optical fiber Bragg grating sensing and Raman sensor is provided, it is characterized in that:
1. comprise light source 1, circulator 2, some Fiber Bragg Grating FBGs 3, wavelength division multiplexer 4, coupling mechanism 5, ramp filter 6, first photodetector 7, second photodetector 8, the 3rd photodetector 9, the 4th photodetector 10, first divider 11, second divider 12 and transducing signal response processing module 13;
2. signal enters circulator 2 through light source 1, circulator 2 connects some Fiber Bragg Grating FBGs 3 and wavelength division multiplexer 4, described wavelength division multiplexer 4 is divided into three the tunnel with signal: the first via enters coupling mechanism 5 and is divided into two bundles again, a branch ofly link to each other with the 3rd photodetector 9 with ramp filter 6, another bundle directly enters first photodetector 7, this two bundles signal all is divided by through first divider 11, is connected with transducing signal response processing module 13 again; The second the tunnel through entering transducing signal response processing module 13 behind second photodetector 8 and second divider 12; Third Road also enters transducing signal response processing module 13 after through the 4th photodetector 10 and second divider 12.
Sensor-based system according to fusion optical fiber Bragg grating sensing provided by the present invention and Raman sensor, it is characterized in that the operation wavelength of three passages of wavelength division multiplexer (4) centre wavelength of the used Fiber Bragg Grating FBG of corresponding system (3) respectively subtracts 13THZ, Fiber Bragg Grating FBG (3) centre wavelength, Fiber Bragg Grating FBG (3) centre wavelength and adds 13THZ.
According to the sensor-based system of fusion optical fiber Bragg grating sensing provided by the present invention and Raman sensor, it is characterized in that the slope wavelength coverage of described ramp filter 6 covers the center wavelength variation scope of Fiber Bragg Grating FBG 3.
Principle of work of the present invention is: LASER Light Source is after ovennodulation, be sent to sensor fibre through circulator 2, the centre wavelength of FBG reflection changes with variations such as ambient temperature or stress, can realize sensing, laser pulse light through sensor fibre can constantly produce Raman scattering light wave (promptly being respectively Anti_Stokes and Stokes light) dorsad simultaneously, Anti_Stokes light power change with the variation of parameters such as place fibre scattering point temperature, can realize sensing.
Transducing signal that reflects from FBG and back are divided into three the tunnel to the Raman scattering light wave by wavelength division multiplexer and handle respectively, one the tunnel enters 1 * 2 coupling mechanism, two-way directly connects photodetector in addition, this two paths of signals is divided by by divider, after handling by the transducing signal response processing module then, by analyzing the Time Domain Reflectometry waveform, utilize OTDR (Optical Time Domain Reflectometer optical time domain reflectometer) principle, change the place of generation after can drawing by force to the Raman diffused light glistening light of waves, analyze the result of divider, draw the size after light intensity changes.The device that is coupled again that enters that road signal of 1 * 2 coupling mechanism is divided into two-way, one the tunnel links to each other with photodetector with ramp filter, another road directly connects photodetector, this two paths of signals is divided by by divider equally, after handling with the transducing signal response processing module, can draw the place that the FBG wavelength variations takes place again, analyze the result of divider, draw the size after the wavelength variations,, calculate the value of temperature and other parameter respectively by analyzing sensing signal processing module.
Beneficial effect of the present invention: only need a simple system just can realize that temperature and other a plurality of parameters measure simultaneously, survey one group of temperature parameters with Ramam effect, FBG measures other parameters, makes the monitoring point more, and the measuring system precision is higher.
Description of drawings
Fig. 1 is a system chart of the present invention.
Wherein, 1, light source, 2, circulator, 3, some Fiber Bragg Grating FBGs, 4, wavelength division multiplexer, 5, coupling mechanism, 6, ramp filter, 7, first photodetector, 8, second photodetector, the 9, the 3rd photodetector, 10, the 4th photodetector, 11, first divider, 12, second divider, 13, the transducing signal response processing module.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described:
As shown in Figure 1, the pulsed light that LASER Light Source produces, be sent to sensor fibre through circulator, enter FBG and (suppose that the FBG wavelength is 1550nm, reflectivity＞90%), transducing signal that reflects from FBG and back are divided into three the tunnel to the Raman scattering light wave by wavelength division multiplexer (operation wavelength of wavelength division multiplexer is 1450nm/1550nm/1665nm) and handle respectively, wavelength is that the light of 1550nm enters 1 * 2 coupling mechanism, two-way (wavelength is 1450nm/1665nm) directly connects photodetector in addition, this two paths of signals is divided by by divider, after handling by the transducing signal response processing module then, by analyzing the Time Domain Reflectometry waveform, utilize OTDR (Optical Time Domain Reflectometer optical time domain reflectometer) principle, change the place of generation after can drawing by force to the Raman diffused light glistening light of waves, analyze the result of divider, draw the size after light intensity changes.The device that is coupled again that enters that road signal of 1 * 2 coupling mechanism is divided into two-way, one the tunnel links to each other with photodetector with ramp filter, another road directly connects photodetector, this two paths of signals is divided by by divider equally, after handling with the transducing signal response processing module, can draw the place that the FBG wavelength variations takes place again, analyze the result of divider, draw the size after the wavelength variations,, calculate the value of temperature and other parameter respectively by analyzing sensing signal processing module.
Claims (3)
1. sensor-based system that merges optical fiber Bragg grating sensing and Raman sensor is characterized in that:
1. comprise light source (1), circulator (2), some Fiber Bragg Grating FBGs (3), wavelength division multiplexer (4), coupling mechanism (5), ramp filter (6), first photodetector (7), second photodetector (8), the 3rd photodetector (9), the 4th photodetector (10), first divider (11), second divider (12) and transducing signal response processing module (13);
2. signal enters circulator (2) through light source (1), circulator (2) connects some Fiber Bragg Grating FBGs (3) and wavelength division multiplexer (4), described wavelength division multiplexer (4) is divided into three the tunnel with signal: the first via enters coupling mechanism (5) and is divided into two bundles again, a branch ofly link to each other with the 3rd photodetector (9) with ramp filter (6), another bundle directly enters first photodetector (7), this two bundles signal all is divided by through first divider (11), is connected with transducing signal response processing module (13) again; The second the tunnel through entering transducing signal response processing module (13) behind second photodetector (8) and second divider (12); Third Road also enters transducing signal response processing module (13) after through the 4th photodetector (10) and second divider (12).
2. the sensor-based system of fusion optical fiber Bragg grating sensing according to claim 1 and Raman sensor, it is characterized in that the operation wavelength of three passages of wavelength division multiplexer (4) centre wavelength of the used Fiber Bragg Grating FBG of corresponding system (3) respectively subtracts 13THZ, Fiber Bragg Grating FBG (3) centre wavelength, Fiber Bragg Grating FBG (3) centre wavelength and adds 13THZ.
3. the sensor-based system of fusion optical fiber Bragg grating sensing according to claim 1 and Raman sensor is characterized in that the slope wavelength coverage of described ramp filter (6) covers the center wavelength variation scope of Fiber Bragg Grating FBG (3).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674117A (en) * | 2013-12-20 | 2014-03-26 | 武汉理工大学 | Raman-scattering-based method and device for simultaneously measuring temperature and strain of identical weak fiber gratings |
| CN104389588B (en) * | 2014-11-14 | 2017-02-22 | 大连理工大学 | Single-light-source optical fiber distribution temperature and fixed-point pressure measurement system and method |
| CN109799286A (en) * | 2019-03-14 | 2019-05-24 | 中国工程物理研究院化工材料研究所 | A kind of reflection type optical fiber acoustic emission system and monitoring method |
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| CN104389588B (en) * | 2014-11-14 | 2017-02-22 | 大连理工大学 | Single-light-source optical fiber distribution temperature and fixed-point pressure measurement system and method |
| CN109799286A (en) * | 2019-03-14 | 2019-05-24 | 中国工程物理研究院化工材料研究所 | A kind of reflection type optical fiber acoustic emission system and monitoring method |
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