CN201837402U - Distributed type real-time fiber bragg grating wavelength demodulating device - Google Patents
Distributed type real-time fiber bragg grating wavelength demodulating device Download PDFInfo
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- CN201837402U CN201837402U CN2010205510544U CN201020551054U CN201837402U CN 201837402 U CN201837402 U CN 201837402U CN 2010205510544 U CN2010205510544 U CN 2010205510544U CN 201020551054 U CN201020551054 U CN 201020551054U CN 201837402 U CN201837402 U CN 201837402U
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Abstract
The utility model relates to a distributed type real-time fiber bragg grating wavelength demodulating device belonging to the technical field of optical fiber sensing. The distributed type real-time fiber bragg grating wavelength demodulating device comprises a tunable semiconductor laser, a 1*N branching unit, N sensing channels, a photoelectric conversion circuit and a signal processing circuit, wherein the output end of the tunable semiconductor laser is connected with the 1*N branching unit, the N sensing channels are respectively connected with the 1*N branching unit, the N sensing channels are all connected with sensing gratings with different bragg wavelengths in series, the output end of the 1*N branching unit is connected with the photoelectric conversion circuit, the output end of the photoelectric conversion circuit is connected with the signal processing circuit, and the output end of the signal processing circuit is connected with the tunable semiconductor laser. In the utility model, the high-power tunable semiconductor laser with controllable output wavelength is adopted, the detecting range is large, and the application prospect is good.
Description
Technical field
The utility model relates to technical field of optical fiber sensing, relates in particular to a kind of distributed real-time optic fiber grating wavelength demodulating equipment.
Background technology
Optical fiber sensing technology is a hot technology that forms gradually along with the development of the appearance of optical fiber and optical fiber communication, and this technology is to be carrier with light, and optical fiber is transmission medium, and tested parameter is monitored.Optical fiber sensing technology is compared with traditional electric sensor, has lightweight, corrosion-resistant, high temperature resistant, and anti-electromagnetic interference (EMI) does not produce advantages such as electromagnetic interference (EMI) yet.In addition, Fibre Optical Sensor collection sensing and be transmitted in one can realize multiplexed and distributed measurement.
Distributing optical fiber sensing mainly contains four classes, is respectively: 1) based on the sensor of Rayleigh scattering; 2) based on the sensor of brillouin effect; 3) based on the sensor of Raman scattering; 4) polarized-modes coupling distributed fiber optic sensor.Wherein former three all is to rely on the optical time domain reflection principle to survey, and the latter utilizes heterodyne approach to carry out the signal demodulation.These method for sensing have some shortcomings, have restricting relation as measuring accuracy and spatial resolution, and detection signal is generally fainter, demodulation computing complexity, and device cost is higher.Above-mentioned four kinds of scheme ranges of application are narrower, and for example Rayleigh scattering is applicable to the strain detection, and Raman scattering is mainly used in temperature monitoring.
The sensor that with the fiber grating is medium can rely on the variable quantity of grating bragg wavelength that different kinds of parameters is measured, and as strain and temperature etc., therefore is widely used.Yet, how demodulating wavelength accurately, the variation of monitoring the fiber grating bragg wavelength in real time is the key and the difficult point of this sensor practicability.How tame research institution and company have proposed the different wave length demodulation techniques both at home and abroad, are used for the standard wavelength location but all methods all need to take one road sensing passage, and this predefined standard wavelength causes scheme portable poor; Utilize the high speed electro-optical realization distributed measurement that opens the light in addition, but configuration is complicated, cost is higher.Such scheme all adopts the super-radiance light emitting diode of wide spectrum to add optical fiber Fabry-Paro wave filter, or semiconductor optical amplifier adds optical fiber Fabry-Paro wave filter as swept light source, the former has limited the measurement port number at more weak spectral density, the configuration of latter's light source is complicated, and, need to increase by one tunnel reference path because the electric hysteresis and the hysteresis effect of piezoelectric ceramics cause wavelength repeatability relatively poor.
The utility model content
At the technical matters of above-mentioned existence, the utility model proposes a kind of device that carries out the optic fiber grating wavelength demodulation based on novel sensing light source, can demodulate wavelength accurately, monitor the variation of fiber grating bragg wavelength in real time.
For achieving the above object, the utility model adopts following technical scheme:
Semiconductor laser with tunable, 1 * N shunt, a N sensing passage, photoelectric switching circuit, signal processing circuit, wherein:
The output terminal of described semiconductor laser with tunable connects described 1 * N shunt;
A described N sensing passage is connected with described 1 * N shunt respectively, and each of a described N sensing passage all is connected in series by the sensing grating of different bragg wavelengths and forms;
The output terminal of described 1 * N shunt connects described photoelectric switching circuit, and described photoelectric switching circuit output terminal connects described signal processing circuit;
Described signal processing circuit output terminal connects described semiconductor laser with tunable.
Described photoelectric switching circuit is made of N PIN coaxial detector, a N amplification/shaping circuit, described N PIN coaxial detector and N corresponding one by one being connected in series of amplification/shaping circuit.
Described signal processing circuit comprises N data latch, 1 processor chips, and described 1 processor chips are connected with described N data latch is unified.
Processor chips in the described signal processing circuit are connected successively with ethernet controller, host computer.
The utlity model has following advantage and good effect:
1) the utility model adopts the semiconductor laser with tunable high-power, that output wavelength is controlled, and the high-power and saved reference channel of laser instrument helps further enlarging the sensor measuring scope;
2) the utility model is because laser instrument has known scanning wavelength, and not needing increases extra standard wavelength location, can simplify demodulating algorithm.
Description of drawings
Fig. 1 is the structural representation of the distributed real-time optic fiber grating wavelength demodulating equipment that provides of the utility model.
Fig. 2 is the connection diagram of photoelectric switching circuit in the Wavelength demodulation system that provides of the utility model.
Fig. 3 is the connection diagram of signal processing circuit in the Wavelength demodulation system that provides of the utility model.
Embodiment
The utility model is described in further detail in conjunction with the accompanying drawings with specific embodiment below:
The distributed real-time optic fiber grating wavelength demodulating equipment that the utility model provides, as shown in Figure 1, this system comprises semiconductor laser with tunable 1,1 * N shunt 2, sensing passage, photoelectric switching circuit 4, signal processing circuit 5.
Wherein, adopt semiconductor laser with tunable 1 as the sensing light source, in the present embodiment, the adjusting of laser output wavelength realizes by the size of control injection current.The wavelength control electric current of laser instrument is scanned, while Laser Measurement device output wavelength, quality according to laser instrument output spectral line is screened, pick out the wavelength that meets the sensing needs, the current value of output wavelength correspondence is compiled into " wavelength-electric current " corresponding relation question blank with this moment, is written in the semiconductor laser with tunable control chip by the arrangement of wavelength size order in the table.
The output terminal of semiconductor laser with tunable 1 connects 1 * N shunt 2, and the luminous power five equilibrium is sent to N sensing passage.Each of N sensing passage is all composed in series by the sensing grating 3 of different bragg wavelengths, supposes that each passage respectively has M sensing grating, just can survey M * N point simultaneously, reaches the purpose of distributed sensing.Simultaneously laser output wavelength information also will be sent to signal processing circuit calls to do to separate.
The reflected light of sensing passage is transported to photoelectric switching circuit 4 through 1 * N shunt 2 and is converted to electric signal; Photoelectric switching circuit 4 will amplify electric signal after the shaping and be delivered to signal processing circuit 5 and carry out Wavelength demodulation and be uploaded to host computer.
Semiconductor laser with tunable 1 is according to the initial wavelength and the wavelength interval of the selected output of control signal of signal processing circuit 5.
Figure 2 shows that the synoptic diagram of photoelectric switching circuit in the Wavelength demodulation system, the reflected signal of each sensing passage inputs to PIN coaxial detector 6 earlier, through amplification/shaping circuit 7 the passage electric signal is sent to signal processing circuit 5 again; That is, photoelectric switching circuit 4 is made of N PIN coaxial detector 6, a N amplification/shaping circuit 7, and each PIN coaxial detector 6 is connected in series with each amplification/shaping circuit 7.
When the output wavelength of semiconductor laser equates with the bragg wavelength of sensing grating 3, this moment the emissivity maximum, the signal intensity that promptly feeds back to photoelectric switching circuit is the strongest.Therefore by judge signal feedback intensity and with this moment semiconductor laser output wave long value relatively, just can demodulate wavelength.
Figure 3 shows that the synoptic diagram of signal processing circuit in the Wavelength demodulation system, signal processing circuit 5 is at first introduced data latches 8 with each passage electric signal, processor chips 9 are selected data latches according to chip selection signal again, thereby distinguish each sensing passage, realize the Wavelength demodulation of different test points, if the wavelength variable quantity and the actual detection physical quantity of sensor-based system are set up corresponding relation, just can realize real-time measurement to different parameters, can save the I/O address of chip in this way; Processor chips 9 demodulate wavelength according to the corresponding relation of feedback signal strength and laser output wavelength, and can further demodulating data be uploaded to host computer 11 by ethernet controller 10.
Above embodiment is only for the usefulness that the utility model is described; but not to restriction of the present utility model; person skilled in the relevant technique; under the situation that does not break away from spirit and scope of the present utility model; can also make various conversion or modification; therefore all technical schemes that are equal to all fall into protection domain of the present utility model.
Claims (4)
1. a distributed real-time optic fiber grating wavelength demodulating equipment is characterized in that, comprising:
Semiconductor laser with tunable (1), 1 * N shunt (2), a N sensing passage, photoelectric switching circuit (4), signal processing circuit (5), wherein:
The output terminal of described semiconductor laser with tunable (1) connects described 1 * N shunt (2);
A described N sensing passage is connected with described 1 * N shunt (2) respectively, and each of a described N sensing passage all is connected in series by the sensing grating (3) of different bragg wavelengths and forms;
The output terminal of described 1 * N shunt (2) connects described photoelectric switching circuit (4), and described photoelectric switching circuit (4) output terminal connects described signal processing circuit (5);
Described signal processing circuit (5) output terminal connects described semiconductor laser with tunable (1).
2. distributed real-time optic fiber grating wavelength demodulating equipment according to claim 1 is characterized in that:
Described photoelectric switching circuit (4) is made of N PIN coaxial detector (6), a N amplification/shaping circuit (7), and described N PIN coaxial detector (6) is connected in series with N amplification/shaping circuit (7) is corresponding one by one.
3. according to each described distributed real-time optic fiber grating wavelength demodulating equipment among the claim 1-2, it is characterized in that:
Described signal processing circuit (5) comprises N data latch (8), 1 processor chips (9), and described 1 processor chips (9) are connected with described N data latch (8) is unified.
4. distributed real-time optic fiber grating wavelength demodulating equipment according to claim 3 is characterized in that:
Processor chips (9) in the described signal processing circuit (5) are connected successively with ethernet controller (10), host computer (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205510544U CN201837402U (en) | 2010-10-08 | 2010-10-08 | Distributed type real-time fiber bragg grating wavelength demodulating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205510544U CN201837402U (en) | 2010-10-08 | 2010-10-08 | Distributed type real-time fiber bragg grating wavelength demodulating device |
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| CN201837402U true CN201837402U (en) | 2011-05-18 |
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| CN2010205510544U Expired - Fee Related CN201837402U (en) | 2010-10-08 | 2010-10-08 | Distributed type real-time fiber bragg grating wavelength demodulating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090991A (en) * | 2013-01-11 | 2013-05-08 | 上虞市电力公司 | Fiber grating demodulator used for taking temperature of electrical equipment |
-
2010
- 2010-10-08 CN CN2010205510544U patent/CN201837402U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090991A (en) * | 2013-01-11 | 2013-05-08 | 上虞市电力公司 | Fiber grating demodulator used for taking temperature of electrical equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110518 Termination date: 20181008 |
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| CF01 | Termination of patent right due to non-payment of annual fee |