CN102829902B - Array-type multi-channel fiber-process Fabry-Perot pressure sensor and pressure measurement method - Google Patents
Array-type multi-channel fiber-process Fabry-Perot pressure sensor and pressure measurement method Download PDFInfo
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Abstract
The invention discloses an array-type multi-channel fiber-process Fabry-Perot pressure sensor and a pressure measurement method. From the input end to the output end, the pressure sensor is sequentially provided with an LED (light-emitting diode) light source array (3) composed of an LED light source modulation module (1) and LED light sources (2), a fiber coupler array (5) composed of fiber couplers (4), a fiber Fabry-Perot sensor array (7) composed of fiber Fabry-Perot sensors (6), a demodulation light path module composed of a fiber array (8), an optical wedge (9) and a linear array CCD (charge-coupled device) (10), and a signal processing unit (11). Compared with the prior art, by combining the LED light source array modulation with the fiber array structure, the invention implements sequential quick demodulation of multiple fiber Fabry-Perot pressure sensors by using a single demodulation light path, and solves the problem that the traditional light switch structure can not simultaneously meet the requirements of high-speed switching, low loss and high reliability; and the channel expansion is easy, so that the number of the sensing channels can be up to 64.
Description
Technical field
The present invention relates to sensory field of optic fibre, particularly relate to a kind of array multichannel optical fiber method amber pressure sensor device and pressure measurement method thereof based on LED light source modulation.
Background technology
Fabry-perot optical fiber pressure transducer is conventionally by fiber end face and diaphragm end face mechanics Fabry-Perot-type micro-resonant cavity, and pressure-acting makes diaphragm deformation on diaphragm, causes Fa-Po cavity length to change, thereby realizes sensing.Because such design feature makes Fabry-perot optical fiber pressure transducer, can not as fiber grating, realize series connection wavelength-division multiplex, its multichannel realization need to be switched by photoswitch.Photoswitch is the conventional device of optical switching system in Optical Fiber Transmission, is widely used in multichannel light fiber sensor system.Photoswitch can be divided into mechanical type and the large class of on-mechanical formula two, mechanical optical switch moves by optical fiber or optical element, light path is changed and realize passage switching, its advantage is that insertion loss is lower, isolation is high, is not subject to the impact of polarization and wavelength, and shortcoming is that switching time is longer, switch moment luminous power shake, switching times is limited and repeated poor.Non-mechanical optical switch relies on electrooptical effect, magneto-optic effect, acoustooptic effect and thermo-optic effect to change waveguide index, light path is changed, the advantage of this class photoswitch is that switching time is short, can reach millisecond even shorter, but the optical characteristics restriction due to device material, conventionally spectrum work spectrum width is narrow, and can not work in visible light wave range.
Summary of the invention
The problem existing based on above-mentioned prior art, the present invention proposes a kind of novel array multichannel optical fiber method amber pressure sensor device and pressure measurement method, by LED light source array and optical fiber Fabry-Perot sensor Array Construction arrayed optical fiber method amber Multichannel sensing device structure, to each LED light source fast modulation, realize the order demodulation of single demodulation light path to a plurality of Fabry-perot optical fiber pressure transducers, reach high speed switching, low-loss, high reliability, multichannel optical fiber method amber sensing object.
The present invention proposes a kind of array multichannel optical fiber method amber pressure sensor device, this device from being input to output terminal LED light source array 3 that LED light source modulation module 1, LED light source 2 form being sequentially set, the fibre coupler arrays 5 that fiber coupler 4 forms, demodulation light path module and the signal processing unit 11 that the optical fiber Fabry-Perot sensor array 7 that optical fiber Fabry-Perot sensor 6 forms, fiber array 8, wedge 9, line array CCD 10 form, wherein:
LED light source array 3, for providing sensing detection wideband light source;
LED light source modulation module 1, for generation of LED light source modulation signal, switches according to modulation signal each LED light source, makes each LED light source in LED light source array luminous and extinguish successively;
Optical fiber Fabry-Perot sensor array 7, changes for experiencing ambient pressure, and pressure is converted into Fa-Po cavity information, and the corresponding different Fa-Po cavities of different pressures chamber is long;
Fibre coupler arrays 5: be incorporated into optical fiber Fabry-Perot sensor array for the light that LED light source array is sent, and the light that optical fiber Fabry-Perot sensor array is returned is incorporated in demodulation light path module;
Demodulation light path module, the light signal returning for receiving fibre coupler arrays, and low coherence interference signal is changed into electric signal, the signal parallel that wherein fiber array 8 returns to fibre coupler arrays imports in demodulation light path;
Signal processing unit; Based on embedded system or computing machine, for extract chamber long message from electric signal, and corresponding one-tenth pressure measurements;
LED light source 2, an optical fiber Fabry-Perot sensor 6 and a fiber coupler 4 form road pressure sensing passages, in advance each road pressure sensing passage is carried out to transducing signal demarcation, this transducing signal calibration value this passage optical fiber Fabry-Perot sensor chamber long with demodulation light path in the corresponding relation of linear array position of interference fringe that CCD10 gathers, as the demodulation foundation of signal processing unit 11.
The fiber-optic output 12 of described fiber array 8 is arranged by certain dot matrix shape, comprises a single word lattice arrangement architecture, double dot matrix arrangement structure and arranges dot matrix or circular dot matrix arrangement structure more.
Described LED light source modulation module 1 output modulating frequency is the modulation signal to 40kHz at 10Hz.
The quantity of described passage is designed to 3 to 64 paths.
Described fiber coupler adopts 1 * 2 multi-module optical fiber coupler, and optical fiber specification comprises 50/125 μ m, 62.5/125 μ m, 80/125 μ m or 100/125 μ m.
The pressure measurement method that utilizes array multichannel optical fiber method amber pressure sensor device, the method comprises the following steps;
Step 1, a LED light source 2, an optical fiber Fabry-Perot sensor 6 and a fiber coupler 4 are formed to road pressure sensing passages, in advance each road pressure sensing passage is carried out to transducing signal demarcation, this transducing signal calibration value is for the corresponding relation of linear array position of interference fringe that CCD10 gathers in this passage optical fiber Fabry-Perot sensor chamber length and demodulation light path, as the demodulation foundation of signal processing unit 11.
Step 2, the acquisition process of carrying out, LED light source modulation module 1 produces LED light source modulation signal, makes a LED light source 2 in a certain moment LED light source array 3 luminous, the unglazed output of other LED light source 2; The light of these paths of LEDs light source 2 outputs arrives optical fiber Fabry-Perot sensor 6 by coupled fiber coupler 4, makes pressure signal be modulated to light signal; Light signal imports to the corresponding optical fiber in fiber array 8 by fiber coupler 6 again, and enters demodulation light path module by the fiber-optic output 12 of fiber array 8;
Step 3, light signal form space low coherence interference striped by the wedge 9 of demodulation light path module, and are received by line array CCD 10, and signal output and the LED light source modulation signal of line array CCD keep synchronizeing;
The interferometric fringe signal of step 4,10 outputs of 11 pairs of line array CCDs of signal processing unit is processed, and therefrom extracts Fa-Po cavity signal, and goes out pressure measurements according to nominal data correspondence;
Step 5, repetition above-mentioned steps two are to step 4, until demodulate the pressure of all passages.
Compared with prior art, the LED light source array modulation that the present invention adopts realizes the order fast demodulation of single demodulation light path to a plurality of Fabry-perot optical fiber pressure transducers in conjunction with fiber array structure, has overcome the problem that traditional optical switch construction cannot meet high speed switching, low-loss, high reliability simultaneously; In addition, the LED fast modulation method that the present invention proposes, greatly promotes sensing passage switch speed, can reach 40kHz.And passage expansion easily, makes sensing passage can reach 64 passages at most.
Accompanying drawing explanation
Fig. 1 is array multichannel optical fiber method amber pressure sensor device structural representation;
Fig. 2 is fiber array schematic diagram,
Wherein: a, be a single word lattice fiber array structure; B, be double dot matrix fiber array structure; C, be four row's dot matrix fiber array structures; D, be circular dot matrix fiber array structure;
White LED light source modulate response signals figure when Fig. 3 is 10kHz modulating frequency;
In Fig. 1:
1, LED light source modulation module 2, LED light source 3, LED light source array 4, fiber coupler 5, fibre coupler arrays 6, optical fiber Fabry-Perot sensor 7, optical fiber Fabry-Perot sensor array 8, fiber array 9, wedge 10, line array CCD 11, signal processing unit
In Fig. 2:
12, fiber-optic output
In Fig. 3:
13, LED light source response wave shape, 14, driving circuit output voltage, 15, modulation voltage
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, structure, feature and effect thereof, be described in detail as follows.
As shown in Figure 1, array multichannel optical fiber method amber pressure sensor device comprises: optical fiber Fabry-Perot sensor array 7, fiber array 8, wedge 9, line array CCD 10 and signal processing unit 11 that the fibre coupler arrays 5 that the LED light source array 3 that LED light source modulation module 1, LED light source 2 form, fiber coupler 4 form, optical fiber Fabry-Perot sensor 6 form.Wherein, the fiber-optic output 12 of fiber array 8 is arranged by certain dot matrix shape, comprises a single word lattice structure, double lattice structure, arranges dot matrix or circular lattice structure, as shown in Figure 2 more.
LED light source 2, an optical fiber Fabry-Perot sensor 6 and a fiber coupler 4 form road pressure sensing passages, first each road pressure sensing passage is carried out to transducing signal demarcation, the corresponding relation of linear array position of interference fringe that CCD10 gathers in this passage optical fiber Fabry-Perot sensor chamber length and demodulation light path is obtained in i.e. experiment, as the demodulation foundation of signal processing unit 11.
Array multichannel optical fiber method amber pressure measurement method, comprise the following steps: during acquisition process, LED light source modulation module 1 produces LED light source modulation signal, make a LED light source 2 in a certain moment LED light source array 3 luminous, the unglazed output of other LED light source 2, the light of these paths of LEDs light source 2 outputs arrives optical fiber Fabry-Perot sensor 6 by coupled fiber coupler 4, makes pressure signal be modulated to light signal.Light signal after modulation imports to the corresponding optical fiber in fiber array 8 by fiber coupler 6 again, and enters demodulation light path module by the fiber-optic output 12 of fiber array 8.In demodulation light path module, light signal is formed space low coherence interference striped and is received by line array CCD 10 by wedge 9, and Linear Array CCD Signal output keeps synchronizeing with LED light source modulation signal.The interferometric fringe signal of 11 pairs of line array CCDs of signal processing unit, 10 outputs is processed, and therefrom extracts Fa-Po cavity signal, and goes out pressure information according to nominal data correspondence.
LED light source modulation module 1 output modulating frequency is the modulation signal to 40kHz at 10Hz, and each LED light source 2 in LED light source array 3 switches according to this modulation signal, luminous and extinguish successively.The low coherence interference stripe signal that line array CCD 10 synchronous acquisition emitting led light source 2 place pressure sensing passages produce, demodulates pressure information corresponding to this road pressure sensing passage by signal processing unit 11.Therefore, signal processing unit 11 is according to the modulation signal of LED light source modulation module 1 output, and order demodulates the pressure information that each pressure sensing passage is corresponding, realizes the array multichannel optical fiber method amber pressure sensing based on LED light source modulation.
The specific embodiment of the present invention is described below:
The Shi You 12 road pressure sensing passages that exemplify in the present embodiment form multichannel optical fiber method amber pressure sensor device, and LED light source modulation module 1 adopts 10kHz voltage modulated frequency, and Dui12 road white LED light source 2 is modulated, and its modulation of source response as shown in Figure 3.Because LED light source response is fast, switch speed is fast, signal stabilization, when voltage modulated frequency is 10kHz, white LED light source response wave shape 13 is complete square wave, and synchronizes with driving circuit output voltage 14 and modulation voltage 15, has extraordinary response characteristic.
White LED light source 2, an optical fiber Fabry-Perot sensor 6 and a fiber coupler 4 form road pressure sensing passages, first pressure sensing passage in Dui12 road carries out respectively transducing signal demarcation, obtain the corresponding relation of linear array position of interference fringe that CCD10 gathers in this passage Fabry-Perot sensor chamber length and demodulation light path, as the demodulation foundation of signal processing unit 11.
During acquisition process, each only has the white LED light source 2 of a road pressure sensing passage to open constantly, and two end face reflection light of the optical fiber Fabry-Perot sensor 6 on this paths exist optical path difference 2d, and wherein d is the distance of two end faces.Two-way reflected light forms light modulating signal, be coupled in optical fiber and by fiber coupler 4 and arrive fiber array 8 Zhong Gai road fiber-optic outputs 12, from the light of fiber-optic output 12 outgoing, pass through wedge 9, arrive line array CCD 10, when the optical path difference of optical fiber Fabry-Perot sensor 6 and wedge 9 generations matches, the corresponding region of line array CCD 10 can produce obvious interference fringe.Signal processing unit 11 is according to the nominal data of this road pressure sensing passage, and the interference fringe that line array CCD 10 is collected is processed, and demodulation obtains the long 2d in Fa-Po cavity chamber, and then obtains force value corresponding to the long 2d in chamber.
LED light source modulation module 1 often completes the output of one group of 12 light signal, and signal processing system completes the demodulation of 12 light modulating signals of this group accordingly.Modulation of source module 1 adopts 10kHz voltage modulated frequency, and collection and the demodulation of every road optical fiber Fabry-Perot sensor 6 signals only need 0.1 millisecond, and this Zu12 road transducing signal of every collection demodulation only needs 1.2 milliseconds.
Analyze the distribution probability of Zhe12 road demodulating data, according to the system failure and distribution probability relation, and the Fault Model of multisensor data fusion foundation, can realize detector to sensor self check.Use the system of single-path optical fiber method amber sensing passage, because the pressure algorithm that sensor signal causes is extremely dispersed, the probability that demodulation result lost efficacy is 5%.Use the system of 12 road Fabry-perot optical fiber sensing passages, by Fault Model, over No. 3 sensors, abnormal signal occurs simultaneously and cause the probability of whole system failure to be reduced to 0.0052%, increase substantially stability and the reliability of system.
Claims (6)
1. an array multichannel optical fiber method amber pressure sensor device, it is characterized in that, this device from being input to output terminal LED light source array (3) that LED light source modulation module (1), LED light source (2) form being sequentially set, the fibre coupler arrays (5) that fiber coupler (4) forms, demodulation light path module and the signal processing unit (11) that the optical fiber Fabry-Perot sensor array (7) that optical fiber Fabry-Perot sensor (6) forms, fiber array (8), wedge (9), line array CCD (10) form, wherein:
LED light source array (3), for providing sensing detection wideband light source;
LED light source modulation module (1), for generation of LED light source modulation signal, switches according to modulation signal each LED light source, makes each LED light source in LED light source array luminous and extinguish successively;
Optical fiber Fabry-Perot sensor array (7), changes for experiencing ambient pressure, and pressure is converted into Fa-Po cavity information, and the corresponding different Fa-Po cavities of different pressures chamber is long;
Fibre coupler arrays (5): be incorporated into optical fiber Fabry-Perot sensor array for the light that LED light source array is sent, and the light that optical fiber Fabry-Perot sensor array is returned is incorporated in demodulation light path module;
Demodulation light path module, the light signal returning for receiving fibre coupler arrays, and low coherence interference signal is changed into electric signal, the signal parallel that wherein fiber array (8) returns to fibre coupler arrays imports in demodulation light path;
Signal processing unit; Based on embedded system or computing machine, for extract chamber long message from electric signal, and corresponding one-tenth pressure measurements;
A LED light source (2), an optical fiber Fabry-Perot sensor (6) and a fiber coupler (4) form a road pressure sensing passage, in advance each road pressure sensing passage is carried out to transducing signal demarcation, this transducing signal calibration value this passage optical fiber Fabry-Perot sensor chamber long with demodulation light path in the corresponding relation of line array CCD (10) position of interference fringe that gathers, as the demodulation foundation of signal processing unit (11).
2. array multichannel optical fiber method amber pressure sensor device as claimed in claim 1, it is characterized in that, the fiber-optic output (12) of described fiber array (8) is arranged by certain dot matrix shape, comprises a single word lattice arrangement architecture, double dot matrix arrangement structure and arranges dot matrix or circular dot matrix arrangement structure more.
3. array multichannel optical fiber method amber pressure sensor device as claimed in claim 1, is characterized in that, described LED light source modulation module (1) output modulating frequency is the modulation signal to 40kHz at 10Hz.
4. array multichannel optical fiber method amber pressure sensor device as claimed in claim 1, is characterized in that, the quantity of described passage is designed to 3 to 64 paths.
5. array multichannel optical fiber method amber pressure sensor device as claimed in claim 1, is characterized in that, described fiber coupler adopts 1 * 2 multi-module optical fiber coupler, and optical fiber specification comprises 50/125 μ m, 62.5/125 μ m, 80/125 μ m or 100/125 μ m.
6. the pressure measurement method that utilizes the array multichannel optical fiber method amber pressure sensor device described in claim 1, is characterized in that, the method comprises the following steps;
Step 1, a LED light source (2), an optical fiber Fabry-Perot sensor (6) and a fiber coupler (4) are formed to a road pressure sensing passage, in advance each road pressure sensing passage is carried out to transducing signal demarcation, this transducing signal calibration value be this passage optical fiber Fabry-Perot sensor chamber long with demodulation light path in line array CCD (10) the corresponding relation of collection position of interference fringe, as the demodulation foundation of signal processing unit (11);
Step 2, the acquisition process of carrying out, LED light source modulation module (1) produces LED light source modulation signal, makes the LED light source (2) in a certain moment LED light source array (3) luminous, the unglazed output of other LED light source (2); The light of this paths of LEDs light source (2) output arrives optical fiber Fabry-Perot sensor (6) by coupled fiber coupler (4), makes pressure signal be modulated to light signal; Light signal imports to the corresponding optical fiber in fiber array (8) by fiber coupler (6) again, and enters demodulation light path module by the fiber-optic output (12) of fiber array (8);
Step 3, light signal form space low coherence interference striped by the wedge (9) of demodulation light path module, and are received by line array CCD (10), and signal output and the LED light source modulation signal of line array CCD keep synchronizeing;
Step 4, signal processing unit (11) are processed the interferometric fringe signal of line array CCD (10) output, therefrom extract Fa-Po cavity signal, and go out pressure measurements according to nominal data correspondence;
Step 5, repetition above-mentioned steps two are to step 4, until demodulate the pressure of all passages.
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| CN103234672B (en) * | 2013-04-17 | 2015-04-08 | 天津大学 | Birefringent crystal temperature compensation based optic fiber pressure sensor and production method thereof |
| CN105466621B (en) * | 2015-12-28 | 2018-02-13 | 天津大学 | A kind of high-resolution polarization low coherence interference device for pressure measurement and method |
| CN105890679B (en) * | 2016-06-20 | 2019-11-22 | 天津大学 | The Fabry-perot optical fiber formula flow rate test method of local buckling water conservancy diversion |
| CN107727283A (en) * | 2017-09-25 | 2018-02-23 | 南京阿凡达机器人科技有限公司 | A kind of robot skin sense of touch system and implementation method |
| CN108362312B (en) * | 2018-02-28 | 2021-04-30 | 山东省科学院激光研究所 | Wavelength demodulation device and system |
| CN110686707B (en) * | 2019-09-06 | 2023-03-28 | 天津大学 | Multichannel polarization low-coherence interference demodulation system and demodulation method based on area array CCD |
| CN113176032B (en) * | 2021-04-23 | 2022-04-05 | 天津大学 | Pressure measurement device and method based on orthogonal phase rapid demodulation and intensity compensation |
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