CN100510665C - Optical fiber fading wave temperature sensor of network structure - Google Patents
Optical fiber fading wave temperature sensor of network structure Download PDFInfo
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- CN100510665C CN100510665C CNB2007100399609A CN200710039960A CN100510665C CN 100510665 C CN100510665 C CN 100510665C CN B2007100399609 A CNB2007100399609 A CN B2007100399609A CN 200710039960 A CN200710039960 A CN 200710039960A CN 100510665 C CN100510665 C CN 100510665C
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 32
- 238000005562 fading Methods 0.000 title 1
- 230000008878 coupling Effects 0.000 claims abstract description 31
- 238000010168 coupling process Methods 0.000 claims abstract description 31
- 238000005859 coupling reaction Methods 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 19
- 239000000523 sample Substances 0.000 claims description 43
- 239000000835 fiber Substances 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 230000001808 coupling effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
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- 238000012360 testing method Methods 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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Abstract
A temperature transducer of optical fiber fade-down wave in networked structure consists of optical source, 1xN optical fiber coupler, detector, signal processing unit and multiple temperature sensor of optical fiber fade-down wave. It is featured as applying pyromatric cone sensing 1x2 optical fiber coupling component as temperature sensor, using comb structure as connection mode for making measurement on multipoint-temperature.
Description
Technical field:
The present invention addresses a kind of optical fiber couple temperature sensor of asymptotic wave of networked structure, belongs to optical fiber and sensor technical field.
Background technology:
Temperature is one of most important three big measurement parameters (stress, temperature, pressure/acoustics).In Fibre Optical Sensor family, measured parameter distributes and is about: stress accounts for 23%, and temperature accounts for 17.2%, and pressure/acoustics accounts for 15.2%.Hundred million dollars of the annual required about hundreds ofs of temperature sensor and system in the whole world, wherein, fibre optic temperature sensor accounts for about 9%.Prediction according to U.S. Frost Sullivan company: a few years from now on Fibre Optical Sensor will be with 17%～20% speed increment.Fibre optic temperature sensor, it not only is used for normal temperature survey, the more important thing is that it can be applicable to some special or abominable occasion, as high pressure, forceful electric power magnetic, nuclear radiation, blast, erosion etc., can't use at these occasion electro-temperature sensors, can bring huge economy and society benefit and solve these difficult problems.In China, along with being on the rise of energy problem, these important energy fields such as power industry transformation, petroleum industry high and stable yields, the peaceful utilization of atomic energy, the networked fibre optic temperature sensor that usability is reliable, highly sensitive, volume is small and exquisite, cheap is absolutely necessary, and also is that electric class temperature sensor institute is irreplaceable.
Present fibre optic temperature sensor kind is more, and development situation both domestic and external mainly shows the following aspects: semiconductor absorption; Raman scattering is distributed; The Fabry-Perot interference formula; The birefringence effect formula; The bragg grating formula, although these sensors some be applied, at aspects such as sensitivity, resolution, practicality, costs, be still waiting further to improve and perfect, as semiconductor absorption, resolution and stability need further to improve; The Raman scattering formula a little less than the signal of detection, needs expensive light source, detector and high performance signal processing unit; Fabry-Perot interference formula, environmental impact are links that has much room for improvement; Birefringence effect formula, practicality also need further research; Bragg grating formula, Wavelength demodulation exist complex structure, problem that cost is high.Therefore, the appearance of this just wait in expectation novel fibre optic temperature sensor and networked sensing technology, thus new raising is arranged on performance and stability, big decline is arranged on cost.
Summary of the invention
The object of the present invention is to provide a kind of optical fiber couple temperature sensor of asymptotic wave of networked structure, it is simple in structure that fibre optic temperature sensor is had, and antijamming capability is strong, highly sensitive, easy to manufacture, cost is low, is applicable to the advantage that requires multi-point temp accurately to measure and control occasion.
For achieving the above object, design of the present invention is:
Characteristics such as that well behaved fibre optic temperature sensor should have is simple in structure, practical, temperature resolution and sensitivity height, this also is the difficult point problem that temperature sensor is realized.The present invention starts with from the network structure and the signal Processing of sensor, has invented a kind of optical fiber couple temperature sensor of asymptotic wave of new-type network structure, is intended to solve the difficult point problem of above-mentioned proposition.It is based on the evanescent wave theory of light wave coupled wave theory and optical fiber, utilize the melting cone type sensing with 1 * 2 optical fiber coupling device as Temperature probe, thereby the evanescent wave that obtains having coupling effect.When surrounding the temperature variation in coupling mechanism sensing nose cone district, the evanescent wave in coupling mechanism awl district becomes the coupling effect of characteristic changing pyrometric cone awl district fiber coupler because of the temperature of covering medium, thereby the coupling coupler visibility of coupling mechanism is changed, detect the coupling coupler visibility like this and just can obtain corresponding temperature parameter.Because utilizing coupling principle, the output signal of test is the coupling coupler visibility, has nothing to do so it changes with the light intensity of light path, and very strong antijamming capability is arranged; Because the coupling coupler visibility has high sensitivity, so this sensor also has very high measurement sensitivity.In order to realize the multipoint temperature measuring of sensor, the present invention adopts the structural design of the networking of pectination, makes performance, cost and the complexity of network structure reach best mode.At first adopting 1 * N fiber coupler to connect light source in the project organization makes its light signal be distributed in each sensing group equably, each group has three sensing heads to adopt the mode of pectination two-stage cascade to constitute, be two two other Temperature probes of output terminals difference cascade of first sensing head, the two-stage that realizes sensing head connects, so both avoided the parallel connection of all sensing heads, detector uses too much, long complexity and the waste situation of circuit; Avoided cascade progression too many again, the situation that back level sensing head signal departs from.
According to above-mentioned design, the present invention adopts following technical proposals:
A kind of optical fiber couple temperature sensor of asymptotic wave of networked structure, comprise light source (1), 1 * N fiber coupler (2), optical fiber evanescent wave 1 * 2 Temperature probe (1-31～1-33,2-31～2-33, ... .N-31～N-33), detector (1-41～1-44,2-41～2-44, ... .N-41～N-44) and signal processing unit (5), it is characterized in that described light source (1) output terminal connects the input end of described 1 * N fiber coupler (2), described 1 * N fiber coupler (2) adopts 2 grades of pectinations to connect 3N described 1 * 2 Temperature probe (1-31～1-33,2-31～2-33, ... .N-31～N-33); N output terminal of described 1 * N fiber coupler (2) connects N one-level 1 * 2 Temperature probe (input end of 1-31～N-31) respectively, N one-level 1 * 2 Temperature probe (1-31～2N output terminal N-31) connects the input end of 2N secondary 1 * 2 Temperature probe (1-32～N-32,1-33～N～33) respectively, 2N secondary 1 * 2 Temperature probe (4N the output terminal of (1-32～N-32,1-33～N～33) connect respectively 4N described detector (1-41～1-44,2-41～2-44 ... the input end of .N-41～N-44); A described 4N detector (1-41～1-44,2-41～2-44 ... 4N the output terminal of .N-41～N-44) all connects described signal processing unit (5); Can obtain the temperature measuring value of each Temperature probe by signal Processing.
The optical fiber couple temperature sensor of asymptotic wave of above-mentioned networked structure, it is characterized in that described optical fiber evanescent wave 1 * 2 Temperature probe (1-31～～1-33,2-31～2-33, ... the structure of .N-31～N-33) is: by two coupled fibers (60,65) fused biconical taper becomes biconial coupling section, it is 18mm * 2～20mm * 2 that the drawing of biconial coupling section stretched segment length, two coupled fibers ((60,65) behind the fused biconical taper, its fibre core (61 is respectively arranged respectively, 66) and covering (62,67), two coupled fibers (60,65) optical fiber (60) in has entrance point and endpiece, and another root optical fiber (65) only has endpiece, its another port is sealed in the encapsulating shell of Temperature probe, thereby forms 1 * 2 structure; Be covered with temperature-sensitive material (68) at biconial coupling section skin, and make the cylindrical shape of profile, there is encapsulating housing (69) temperature-sensitive material (68) outside.
A kind of signal processing unit (5) that is used for the networked structure of above-mentioned optical fiber couple temperature sensor of asymptotic wave comprising: (four amplifiers of 1-41～1-44) are respectively (1-51～1-54) to connect four detectors, the output electric signal of four amplifiers connects subtracter (1-55,1-57) and totalizer (1-56,1-58) respectively simultaneously, the signal of last subtracter (1-55,1-57) and totalizer (1-56,1-58) enters into divider (1-59,1-50) respectively, thereby has realized (P
11-P
12)/(P
11+ P
12) and (P
13-P
14)/(P
13+ P
14) coupling coupler visibility signal processing function, two phase division result are Temperature probe (1-32) and (1-33) output signal, P here
11, P
12, P
13And P
14Be respectively 1 * 2 Temperature probe (1-32) and two-way output power (1-33).So, the output power of 1 * 2 Temperature probe (1-31) is respectively (P
11+ P
12) and (P
13+ P
14), the coupling coupler visibility of 1 * 2 Temperature probe (1-31) is (P
11+ P
12-P
I3-P
14)/(P
11+ P
12+ P
13+ P
14), can draw Temperature probe (1-31), (1-32) and measuring-signal (1-33) thus, more than only be first group of three temperature sensing header structure in the N road network network, the method for testing on all the other N-1 roads is identical with the first via.
The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: adopt among the present invention the melting cone type sensing with 1 * 2 optical fiber coupling device as Temperature probe, temperature variation around its awl district sensing, change its coupling effect, the coupling coupler visibility of its coupling mechanism is changed, and then corresponding its temperature parameter of the coupling coupler visibility signal that utilizes signal processing technology to realize.Owing to utilize coupling principle, output signal is the coupling coupler visibility of coupling mechanism, the light intensity of it and light path changes irrelevant, so very strong antijamming capability is arranged, simultaneously, its coupling effect is very responsive and have highly sensitive signal processing system to temperature variation, so temperature sensor has very high sensitivity.The present invention adopts the structural design of pectination, have simple in structure, easy to manufacture, characteristics such as cost is low.The present invention is suitable for requirement and multi-point temp is carried out is accurately measured and the occasion of control, numerous areas such as for example industry manufacturing, properties of product detection, environmental monitoring, bio-science and scientific research, and can be in real time, temperature survey in high sensitivity.
Description of drawings
Fig. 1 is a networked structured flowchart of the present invention;
Fig. 2 is the structural representation of melting cone type sensing with 1 * 2 optical fiber coupling device;
Fig. 3 is the signal processing unit block diagram of the networked structure first sensing group;
Fig. 4 is the experimental result of the specific embodiment of the invention.
Embodiment
A preferred embodiment of the present invention accompanying drawings is as follows:
This example is only implemented with the first sensing group of networked structure, referring to Fig. 1, Fig. 2 and Fig. 3, this is the most basic enforcement networking unit (N=1), the networked structure of this optical fiber couple temperature sensor of asymptotic wave includes light source 1, (this moment, fiber coupler 2 can omit), optical fiber evanescent wave Temperature probe 1-31～1-33, detector 1-41～1-44 and signal processing unit 5, it is characterized in that adopting the melting cone type sensing with 1 * 2 optical fiber coupling device as Temperature probe 1-31～1-33, its Temperature probe adopts the pectination two-stage to connect, light source 1 links to each other with 1 end of 1 * 2 Temperature probe 1-31, and the last output terminal of 1 * 2 Temperature probe 1-31 links to each other with 1 end of 1 * 2 Temperature probe 1-32, the following output terminal of 1 * 2 Temperature probe 1-31 links to each other with 1 end of 1 * 2 Temperature probe 1-33.Two output terminals of 1 * 2 Temperature probe 1-32～1-33 are parallel respectively to link to each other with detector 1-41～1-44, and last, the output terminal of detector 1-41～1-44 is connected in signal processing unit 5; Can obtain the temperature measuring value of each Temperature probe by signal Processing.The networked structure of above-mentioned optical fiber couple temperature sensor of asymptotic wave, the structure that it is characterized in that described 1 * 2 Temperature probe 1-31～1-33 is: become biconial coupling section with 65 fused biconical tapers by two coupled fibers 60, the tensile elongation of double cone is 18mm * 2, behind two coupled fibers 60 and 65 fused biconical tapers, its fibre core is 61,66, covering is 62 and 67, two one of coupled fibers have entrance point and endpiece, and another root only has endpiece, its another port is sealed in the encapsulating shell of Temperature probe, thereby has formed one 1 * 2 structure; Be covered with temperature-sensitive material 68 at biconial coupling section skin, and make the cylindrical shape of profile, there is encapsulating housing 69 temperature-sensitive material 68 outsides.
The signal processing unit 5 of the networked structure of this optical fiber couple temperature sensor of asymptotic wave comprises: four amplifiers that connect four detector 1-41～1-44 are respectively 1-51～1-54, the output electric signal of four amplifiers connects subtracter 1-55 and 1-57, totalizer 1-56 and 1-58 respectively simultaneously, the signal of last subtracter 1-55 and 1-57, totalizer 1-56 and 1-58 enters into divider 1-59 and 1-50 respectively, thereby has realized (P
11-P
12)/(P
11+ P
12) and (P
13-P
14)/(P
13+ P1
4) coupling coupler visibility signal processing function, two phase division result are Temperature probe 1-32 and 1-33 output signal, P here
11, P
12, P
13And P
14Be respectively the two-way output power of 1 * 2 Temperature probe 1-32 and 1-33.So, the output power of 1 * 2 Temperature probe 1-31 is respectively (P
11+ P
12) and (P
13+ P
14), the coupling coupler visibility of 1 * 2 Temperature probe 1-31 is (P
11+ P
12-P
13-P
14)/(P
11+ P
12+ P
13+ P
14), can draw Temperature probe 1-31 thus), the measuring-signal of 1-32 and 1-33.Concrete test result is seen Fig. 4, and " ▲ " mark is the experimental result of sensing head 1-31 among the figure; " ● " mark be the experimental result of sensing head 1-32; " ■ " mark be the experimental result of sensing head 1-33, above result all is what to measure in-40～85 ℃ temperature range, can find out that from figure the result that this patent is implemented has good effect.
Claims (2)
1. the optical fiber couple temperature sensor of asymptotic wave of a networked structure, comprise light source (1), 1 * N fiber coupler (2), optical fiber evanescent wave 1 * 2 Temperature probe (1-31～1-33,2-31～2-33, ... .N-31～N-33), detector (1-41～1-44,2-41～2-44, ... .N-41～N-44) and signal processing unit (5), it is characterized in that described light source (1) output terminal connects the input end of described 1 * N fiber coupler (2), described 1 * N fiber coupler (2) adopts 2 grades of pectinations to connect 3N described 1 * 2 Temperature probe (1-31～1-33,2-31～2-33, ... .N-31～N-33): N output terminal of described 1 * N fiber coupler (2) connects N one-level 1 * 2 Temperature probe (input end of 1-31～N-31) respectively, (2N the output terminal of 1-31～N-31) connects 2N secondary 1 * 2 Temperature probe (1-32～N-32 respectively for N one-level 1 * 2 Temperature probe, 1-33～N～33) input end, 2N secondary 1 * 2 Temperature probe ((1-32～N-32,1-33～N～33) a 4N output terminal connects 4N described detector (1-41～1-44 respectively, 2-41～2-44, ... the input end of .N-41～N-44); A described 4N detector (1-41～1-44,2-41～2-44 ... 4N the output terminal of .N-41～N-44) all connects described signal processing unit (5), promptly obtains the temperature measuring value of each Temperature probe by signal Processing.
2. the optical fiber couple temperature sensor of asymptotic wave of networked structure according to claim 1, it is characterized in that described optical fiber evanescent wave 1 * 2 Temperature probe (1-31～～1-33,2-31～2-33, ... the structure of .N-31～N-33) is: by two coupled fibers (60,65) fused biconical taper becomes biconial coupling section, it is 18mm * 2～20mm * 2 that the drawing of biconial coupling section stretched segment length, two coupled fibers ((60,65) behind the fused biconical taper, its fibre core (61 is respectively arranged respectively, 66) and covering (62,67), two coupled fibers (60,65) optical fiber (60) in has entrance point and endpiece, and another root optical fiber (65) only has endpiece, its another port is sealed in the encapsulating shell of Temperature probe, thereby forms 1 * 2 structure; Be covered with temperature-sensitive material (68) at biconial coupling section skin, and make the cylindrical shape of profile, there is encapsulating housing (69) temperature-sensitive material (68) outside.
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|---|---|---|---|
| CNB2007100399609A CN100510665C (en) | 2007-04-25 | 2007-04-25 | Optical fiber fading wave temperature sensor of network structure |
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| CNB2007100399609A CN100510665C (en) | 2007-04-25 | 2007-04-25 | Optical fiber fading wave temperature sensor of network structure |
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| CN100510665C true CN100510665C (en) | 2009-07-08 |
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| CN113074828B (en) * | 2021-03-23 | 2024-07-16 | 西安晶淼光电科技有限公司 | Explosion flame light splitting unit, spectrum light splitting temperature measuring system and method |
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