CN1412538A - Broad-band light source signal detection method and its detector - Google Patents
Broad-band light source signal detection method and its detector Download PDFInfo
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- CN1412538A CN1412538A CN 02124123 CN02124123A CN1412538A CN 1412538 A CN1412538 A CN 1412538A CN 02124123 CN02124123 CN 02124123 CN 02124123 A CN02124123 A CN 02124123A CN 1412538 A CN1412538 A CN 1412538A
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Abstract
The method for detecting wideband light source signal includes the following steps: 1. laying the polarization-protecting optical fibre on the tested body; 2. one end of the polarization-protecting optical fibre is inputted into wideband detection light source; 3. using polarizing spectroscopic system to divide the wideband detection light source outputted by another end of the polarization-protecting optical fibre into linear polarized light, reflecting and transmission, feeding the linear polarized light into Michelson interferometer; and 4. making the interference light signal undergo the processes of collection, photoelectric conversion, A/D conversion, etc. to output the detection parameters of said tested body. Said invented detector is formed from detection light source system.
Description
Technical field
The invention belongs to the optical gauge class, relate in particular to the instrument that the wideband light source transmission detects.
Background technology
At present, in wideband light source transmission, when linearly polarized light during along a feature axis (fast axle or the slow axis) incident of polarization maintaining optical fibre, light signal can be propagated along this axle, is not coupled to another feature axis.Because Effect of Environmental, the influence as factors such as pressure, tension force, torsion, temperature can cause the coupling of feature axis of optical signals to another feature axle.Therefore, by detecting the relative intensity of the light signal of each point coupling in optical fiber, just can be used for detecting the acting force that this point is subjected to or the variation of environment temperature.
United States Patent (USP) discloses a kind of difference formula Fibre Optical Sensor that adopts phase modulation technique for US5555086 number, the relative intensity of the light signal of each point coupling when detecting wideband light source and in optical fiber, transmitting, but its complex structure, modulation and demodulation and relevant signal Processing can increase considerably the cost of sensor.
United States Patent (USP) also discloses a kind of employing total reflection structure for US5094534 number, with relevant selective light fiber sensor, the relative intensity of the light signal of each point coupling when detecting wideband light source and in optical fiber, transmitting, but it does not possess the distributed monitoring function for the treatment of detection signal.
Summary of the invention
The purpose of this invention is to provide a kind of wideband light source signal detector, solve an above-mentioned difficult problem, to satisfy many-sided needs such as easy system simple in structure, easy to operate, economy.
The object of the present invention is achieved like this:
A kind of broad-band light source signal detection method comprises the following steps:
1, with the polarization maintaining optical fibre testee that is laid in;
2, by the end input wide band detection light source of polarization maintaining optical fibre;
3, the wide band detection light source of the other end of polarization maintaining optical fibre being exported by the polarized light beam splitting system is divided into linearly polarized light, and reflection enters Michelson interferometer and transmission enters Michelson interferometer;
4, by the interference light signal of light source detection system,, export the detected parameters of tested object through convergence, opto-electronic conversion, analog to digital conversion and processing with transmission of Michelson interferometer reflecting system and transmissive system reflection.
Adopt a kind of detecting device of broad-band light source signal detection method, comprising:
1, the detection light source system is made up of wideband light source, polarizer A, is used for wideband light source is converted to detectable linearly polarized light;
2, polarization maintaining optical fibre is used to the testee that is laid in, and the linearly polarized light with the output of detection light source system transfers to the polarized light beam splitting system;
3, the polarized light beam splitting system, be made up of extender lens, λ/2 wave plates, polarizer B, polarization splitting prism, the linearly polarized light that is used for that polarization maintaining optical fibre is exported reflects the linearly polarized light transmission that enters Michelson interferometer and polarization maintaining optical fibre is exported and enters Michelson interferometer;
4, the Michelson interferometer reflecting system is made of plane mirror A, piezoelectric ceramics, is used for the reflected light of polarized light beam splitting system is returned along original optical path;
5, the Michelson interferometer transmissive system is made of flat square catoptron, plane mirror B, linear motion guide rail, is used for the linearly polarized light of polarized light beam splitting system transmission is returned along original optical path after reflecting for several times;
6, the light source detection system, constitute by convergent lens, photodetector and analog to digital conversion and digital signal processing circuit, photodetector is connected with analog to digital conversion and digital signal processing circuit, be used for interference light signal with Michelson interferometer transmissive system reflection and reflecting system transmission through convergence, opto-electronic conversion, analog to digital conversion and processing, export the detected parameters of tested object.
Because the present invention has adopted above technical scheme, thereby has following advantage:
1, adopt the light source of wideband light source, thereby guaranteed the precision of measuring as Fibre Optical Sensor.
2, adopt linear motion guide rail to realize of the scanning of interferometer scan arm to optical path difference, improved the precision of measuring.
3, on the scan arm of interferometer, adopt corner cube mirror, replace the common planar catoptron, thereby guaranteed the precision of measuring.
4, on scan arm, adopt multireflection technique, but enlarged the length range of detection fiber.
5, on the fixed arm of interferometer, adopt piezoelectric ceramics to carry out high precision scanning, reduced measuring error to the stiffness of coupling of polarization maintaining optical fibre polarization coupled point, improved measuring accuracy to polarization coupled intensity.
6, adopt the high precision analogue translation circuit, realize accurate measurement to polarization coupled intensity.
7, unitary construction is simple, and it is very convenient to manipulate, and product price is cheap, and market outlook are wide.
Description of drawings
Fig. 1 is a kind of optical configuration synoptic diagram of the present invention.
Among the figure:
1, wideband light source 2, polarizer A 3, analog to digital conversion and digital signal processing circuit
4, extender lens 5, polarization maintaining optical fibre 6, λ/2 wave plates
7, polarizer B 8, polarization splitting prism 9, plane mirror A
10, piezoelectric ceramics 11, flat square catoptron 12, plane mirror B
13, convergent lens 14, photodetector 15, linear motion guide rail
Embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is done as detailed below:
In Fig. 1, a kind of detecting device of broad-band light source signal detection method comprises:
1, the detection light source system is made up of wideband light source 1, polarizer A2, is used for wideband light source is converted to detectable linearly polarized light;
2, polarization maintaining optical fibre 5 is used to the testee that is laid in, and the linearly polarized light with the output of detection light source system passes to the polarized light beam splitting system;
3, the polarized light beam splitting system, form by extender lens 4, λ/2 wave plates 6, polarizer B7, polarization splitting prism 8, be used for that the linearly polarized light that polarization maintaining optical fibre 5 is exported is reflected the linearly polarized light transmission that enters Michelson interferometer and polarization maintaining optical fibre 5 is exported and enter Michelson interferometer;
4, the Michelson interferometer reflecting system is made of plane mirror A9, piezoelectric ceramics 10, is used for the reflected light of polarized light beam splitting system is returned along original optical path;
5, the Michelson interferometer transmissive system is made of flat square catoptron 11, plane mirror B12, linear motion guide rail 15, is used for the linearly polarized light of polarized light beam splitting system transmission is returned along original optical path after reflecting for several times;
6, the light source detection system, constitute by convergent lens 13, photodetector 14 and analog to digital conversion and digital signal processing circuit 3, be used for interference light signal with Michelson interferometer transmissive system reflection and reflecting system transmission through convergence, opto-electronic conversion, analog to digital conversion and processing, storage, export the detected parameters of tested object.
In said system,
Wideband light source 1: be used to send the light signal that Optical Fiber Transmission detects; Can adopt the SDM-1300-1 model, its centre wavelength is 1300nm, and full width at half maximum is 40nm, and luminous power is 0.3mW.
Polarizer A2 and polarizer B7: be used for the wideband light source 1 of input is converted to linearly polarized light, input to polarization maintaining optical fibre 5; Can adopt the 10GL08AR.18 model, its clear aperature is 10mm, operating wavelength range 1000～1550nm, extinction ratio＞10
5: 1.
Polarization maintaining optical fibre 5: be used for the detected parameters of object to be detected is converted to the variation of polarized light signal stiffness of coupling, and polarized light signal is transferred to the polarized light beam splitting system, can adopt commercial panda type polarization-preserving fiber.
Extender lens 4 is used for the light signal of 5 outputs of the polarization maintaining optical fibre on the testee that is laid in is expanded bundle, exports λ/2 wave plates 6 to; It can be according to the needs of system dimension customized or type selecting.
λ/2 wave plates 6: be used for the direction of vibration of rotatory polarization light signal, two orthogonal direction of vibration that make polarized light all are 45 ° of angles with the major axes orientation of polarizer B7, can adopt the 05RP02-1300 model, and its diameter is 12.7mm, postpones precision and is better than 5nm.
Polarization splitting prism 8: be used for polarized light signal is divided into reflected light and transmitted light two parts by energy, keep the direction of vibration of polarized light constant simultaneously, can adopt the 05BC17MB.3 model, its working range wavelength is 1100～1600nm, size 12.7mm.
Piezoelectric ceramics 10: be used for micrometric displacement is carried out in the position of plane mirror A9, thereby realization improves the measuring accuracy to the polarized light signal stiffness of coupling to the micro scanning of interference light signal optical path difference; Can adopt the MPT-1L005NA model of Boshi Accurate Test Control Co Ltd, Harbin pllytechnical Univ, its stroke is 25 microns, and resolution is 10 nanometers.
Photodetector 14: be used for interference light signal is converted to current signal, so that the collection of signal and processing, can adopt the PDS455 model of Beijing SWT Optical Communication Technology Co., Ltd., the photosurface diameter is 300 microns, the central task wavelength is 1300nm, responsiveness 0.9A/W, dark current 1.0nA.
Analog to digital conversion and digital signal processing circuit 3: be used for photodetector 14 input analog optical signals being converted to the light digital signal and handling and store, and export accurate measurement data.Analog to digital conversion can adopt the DDC101 model, its 20 precision, and frequency of operation can reach 15KHz; Digital signal processing can adopt computer software programming to realize, or adopts digital signal processor to realize.
Linear motion guide rail 15: be used to regulate the stroke of flat square catoptron 11, to obtain the polarization coupled light signal of diverse location in the polarization maintaining optical fibre 5, can adopt the SKR33 model, its stroke is 180mm, and 6 microns of positional precisions, flatness can reach 0.9 μ m.
In actual use, using method concrete operations of the present invention are as follows:
1, the light signal warp polarizer A2 that is sent by wideband light source SLD 1 is converted to linearly polarized light, and this linearly polarized light is coupled into the fast axle or the slow axis of polarization maintaining optical fibre 5.
2, when being converted to linearly polarized light by polarizer A2, being coupled into the light signal of polarization maintaining optical fibre 5 propagates forward along a feature axis (fast axle or slow axis) of optical fiber, through polarization maintaining optical fibre 5, when object to be detected tension force, pressure or parameters such as torsion and temperature when changing, polarized light signal is coupled into another feature axis by a feature axis.The intensity of coupling optical signal is by the amount of force and the decision of variation of temperature amount of polarization maintaining optical fibre 5 positions.
3, the light signal of polarization maintaining optical fibre 5 outgoing is extended to 6～10mm to spot diameter through extender lens 4, change polarization directions through λ/2 wave plates, 6 rotations then, make two feature axis of polarized light behind λ/2 wave plates 6 and the main shaft angle at 45 of polarizer B7.
4, behind polarizer B7, two components all project to the main shaft of polarizer B7, become linearly polarized light, enter polarization splitting prism 8 by orthogonal two components of the direction of vibration of polarized light.
5, polarization splitting prism 8 is divided into two parts to the light signal of incident: a part enters the fixed arm of Michelson interferometer through reflection, returns along original optical path after plane mirror A9 reflection; Another part enters the scan arm of Michelson interferometer through transmission, carries out returning along original optical path after the triple reflection through flat square catoptron 11 and plane mirror B12.Two-way is distinguished the light signal of reflected back behind polarization splitting prism 8, zone between polarization splitting prism 8 and convergent lens 13 produces interferes, and the amplitude of interference signal is decided by the size of two polarized components of polarized light and the optical path difference between scan arm and the fixed arm.
6, by the linear motion guide rail 15 plane of motion corner cube mirrors 11 of scan arm, can the size of the polarization coupled component of diverse location generation in the polarization maintaining optical fibre 5 be detected respectively.Thereby in a polarization maintaining optical fibre 5, realized the effect of a plurality of sensor.
7, make the plane mirror A9 of Michelson interferometer fixed arm produce micrometric displacement by piezoelectric ceramics 10, realize accurate scanning to polarization coupled point.After adopting piezoelectric ceramics 10, the accuracy of detection of polarization coupled intensity is compared with not adopting piezoelectric ceramics, accuracy of detection is brought up to more than 95% by 62%.Thereby significantly improved measuring accuracy to detected parameter.
8, the light signal of interference incides photodetector 14 after convergent lens 13 is assembled, be converted to current signal, again through analog to digital conversion and digital signal processing circuit 3, exports the detection accurate parameters of tested object.
From the above mentioned, the present invention adopts the Michelson optical interdferometer that the polarized light signal intensity of each point coupling in the polarization maintaining optical fibre is detected, adopt precision stepper motor to drive linear motion guide rail the locus of each polarization coupled point in the polarization maintaining optical fibre is detected, thereby in an optical fiber, realized a plurality of distributed fiberoptic sensors.By adopting piezoelectric ceramics that interference light signal is carried out micro scanning, can improve the precision of testing result.Utilize the low coherent length and the light path scanning technique of wideband light source in an optical fiber, to realize a plurality of distributed fiberoptic sensors, can reduce the cost of sensor significantly.
The present invention is because its volume is little, in light weight, the influence that is not subjected to electromagnetic interference (EMI), can be in rugged environment operate as normal.Can be widely used in bridge, building, important industry or civilian installation, detected object is carried out continuous monitoring to ensure its safety, to run well.In new-type passenger plane and defence equipment that some are important, the present invention also can monitor in real time to its performance parameter, with security and the stability that ensures its operation.
Claims (2)
1. a broad-band light source signal detection method comprises the following steps:
1) polarization maintaining optical fibre is laid in testee;
2) import the wide band detection light source by an end of polarization maintaining optical fibre;
3) the wide band detection light source of the other end of polarization maintaining optical fibre being exported by the polarized light beam splitting system is divided into linearly polarized light, and reflection enters Michelson interferometer and transmission enters Michelson interferometer;
4) by the interference light signal of light source detection system,, export the detected parameters of tested object through convergence, opto-electronic conversion, analog to digital conversion and processing with transmission of Michelson interferometer reflecting system and transmissive system reflection.
2. adopt the detecting device of the described a kind of broad-band light source signal detection method of claim 1, it is characterized in that it comprises:
1) detection light source system is made up of wideband light source, polarizer A, is used for wideband light source is converted to detectable linearly polarized light;
2) polarization maintaining optical fibre is used to the testee that is laid in, and the linearly polarized light with the output of detection light source system transfers to the polarized light beam splitting system;
3) polarized light beam splitting system, form by extender lens, λ/2 wave plates, polarizer B, polarization splitting prism, the linearly polarized light that is used for that polarization maintaining optical fibre is exported reflects the linearly polarized light transmission that enters Michelson interferometer and polarization maintaining optical fibre is exported and enters Michelson interferometer;
4) Michelson interferometer reflecting system is made of plane mirror A, piezoelectric ceramics, is used for the reflected light of polarized light beam splitting system is returned along original optical path;
5) Michelson interferometer transmissive system is made of flat square catoptron, plane mirror B, linear motion guide rail, is used for the linearly polarized light of polarized light beam splitting system transmission is returned along original optical path after reflecting for several times;
6), the light source detection system, constitute by convergent lens, photodetector and analog to digital conversion and digital signal processing circuit, photodetector is connected with analog to digital conversion and digital signal processing circuit, be used for interference light signal with Michelson interferometer transmissive system reflection and reflecting system transmission through convergence, opto-electronic conversion, analog to digital conversion and processing, export the detected parameters of tested object.
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| CNB021241236A CN1180237C (en) | 2002-07-12 | 2002-07-12 | Broad-band light source signal detection method and its detector |
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| CN102680211A (en) * | 2012-05-28 | 2012-09-19 | 中国电子科技集团公司第四十一研究所 | Method for testing polarization coupling strength of polarization maintaining optical fiber based on polarization beam-splitting interference technique |
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