CN104567996A - Temperature and pressure measurement image demodulation method and device based on FBG (Fiber Bragg Grating) sensor - Google Patents
Temperature and pressure measurement image demodulation method and device based on FBG (Fiber Bragg Grating) sensor Download PDFInfo
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- CN104567996A CN104567996A CN201410796427.7A CN201410796427A CN104567996A CN 104567996 A CN104567996 A CN 104567996A CN 201410796427 A CN201410796427 A CN 201410796427A CN 104567996 A CN104567996 A CN 104567996A
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Abstract
The invention relates to a temperature and pressure measurement image demodulation method based on an FBG (Fiber Bragg Grating) sensor. The temperature and pressure measurement image demodulation method comprises the following steps: connecting a plurality of FBGss (Fiber bragg Gratings) sensors on two optical fibers connected in series, enabling reflected light of the FBGs sensors to firstly pass through respective corresponding 1*2 couplers and then to be triggered by a trigger and storing FBGs sensor information; successively, connecting a trigger selector with a certain closed circuit of a 2*2 optical switch to enable the FBGs sensors to be collected in a limited plane, gathering light spots through a focusing lens to enable an INGAAS image sensor to obtain array light spots transmitted from the special optical switch, calculating all displacement amounts delta lambda of FBG wavelengths according to the formula in the description and further identifying signals of all the FBGs sensors. According to the temperature and pressure measurement image demodulation method, the micro signals of the FBGs sensors can be detected and identified, the quick and accurate measurement of temperature and pressure measurement image demodulation is realized, and a device for realizing the method is provided through taking the internal temperature and pressure of canned natural gas as an example.
Description
Technical field
The invention belongs to FBG sensor application field, relate to the multi signal analysis identification to FBG sensor, relate in particular to a kind of temperature, pressure measurement image demodulation method based on FBG sensor and device.
Background technology
The essence of blipology carries out Real-Time Monitoring to sensing grating (FBG) reflectance spectrum, analyzes the position of centre wavelength.Namely need signal to become electric signal from light signal, then transfer the process of digital signal to from electric signal.For FBG sensor-based system, usually require that demodulating system has very high demodulation speed and precision, realize dynamic and static state can detect, and can detect faint optical signal, the ability detecting faint optical signal is stronger, and the sensing grating that fiber grating sensing system can be multiplexing is more, measurement point is corresponding also more, but be all restricted at present, up to the present, also there is no that a kind of recognition technology can meet high resolving power, many physical quantitys, multipoint multiplexing detect and the not high practical requirement of cost simultaneously.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, a kind of temperature, pressure based on FBG sensor is the object of the present invention is to provide to measure transducing signal recognition methods and device, can be separated and identify temperature, pressure micro-signal, and Intellisense information identifying method, to realize simultaneously, accurately and measuring tempeature and pressure; Present invention also offers a kind of device realizing the method.
To achieve these goals, the technical solution used in the present invention is:
Based on the temperature, pressure measurement image demodulation method of FBG sensor, two optical fiber are connected in series multiple FBGs sensor respectively, the reflected light of each FBGs sensor is first through each self-corresponding 1*2 coupling mechanism, trigger through trigger again, store FBGs sensor information, then triggering selection is connected with a certain path of 2*2 photoswitch, collect in a limited plane, then pool array hot spot by condenser lens and obtained, according to formula by INGAAS imageing sensor
calculate each displacement Δ λ of FBG grating wavelength, and then identify the signal of each FBGs sensor, wherein p is Pixel Dimensions, and Δ p is pixel-shift number, and f is camera focal length, and D is the distance of camera lens to scenery.
For n node, each node needs measuring tempeature and pressure two parameters, and concrete methods of realizing is as follows: the FBG of each node of sensing unit
n1sensor reflected signal is connected with first 1*2 coupler input, FBG
n2sensor reflected signal is connected with second 1*2 coupler input, wherein: n is node number; FBG
n1sensor is the sensor of measuring tempeature; FBG
n2sensor is the sensor of measuring tempeature and pressure.
Present invention also offers a kind of temperature, pressure measurement image demodulating equipment based on FBG sensor, comprise and being parallel to each other and close two optical fiber, FBGs sensor is scribed two optical fiber same distance positions, first optical fiber is connected with first 1*2 coupler input, second optical fiber is connected with second 1*2 coupler input, the output signal of each 1*2 coupling mechanism is after the 2*2 photoswitch respective channel of trigger triggering selection, pass through condenser lens again, be fed through INGAAS imageing sensor, INGAAS imageing sensor is connected with image processing module.
A built-in storer in described trigger, by trigger prioritizing selection a certain road FBGs signal, in positional information and the change temporal information of this FBGs signal of memory recording address book stored.
The present invention compared with prior art, has the following advantages:
1) temperature, pressure can be realized to measure simultaneously, and the mutual interference phenomenon of temperature, pressure can be solved.
2) with image display, more intuitively.
3) often to identify a transducing signal by existing wavelength-modulation technique, need at least corresponding three groups of parameters just can draw, and algorithm be more complicated, is not suitable for, multimetering.
4) compared with the demodulation of existing FBG light spot image, hardware has lacked several eyeglass, can conserve space greatly, be convenient to integrated.
5) propose a kind of image recognition technology, by trigger, storer and photoswitch, select and record FBGs position and time sequence information, carrying out the selection of FBGs priority, hot spot on FBG light spot image is greatly reduced, being convenient to demarcate.
6) propose new FBG spot identification calibration technique, different colours is set in conjunction with FBGs positional information and light intensity determination respective threshold, carry out FBG according to color and demarcate and identify; Also have before and after FBG and position excursion occurs, the same with real physical amplitude of variation exist continuity; Adopt sequential in conjunction with the comparison of FBG centre coordinate change curve continuity, by light spot image except making an uproar, Boundary Detection, finding center point carries out FBG hot spot and demarcates one by one.
7) the method does not need to carry out control FBGs signal transmission with how many photoswitches, has stronger wavelength-division multiplex ability and antijamming capability.
Accompanying drawing explanation
Fig. 1 is measuring principle schematic diagram of the present invention, and black arrow represents incident light, and dotted arrow represents reflected light.
Fig. 2 is the 2*2 trigger structure schematic diagram of tape storage of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
As shown in Figure 1, a kind of temperature, pressure measurement image demodulation method based on FBG sensor, two optical fiber are connected in series multiple FBGs sensor respectively, the reflected light of each FBGs sensor is first through each self-corresponding 1*2 coupling mechanism, trigger through trigger, store FBGs information, then triggering selection is connected with a certain path of 2*2 photoswitch, collects in a limited plane, pool array hot spot by condenser lens again and obtained, according to formula by INGAAS imageing sensor
calculate each displacement Δ λ of FBG grating wavelength, and then identify the signal of each FBGs sensor, wherein p is Pixel Dimensions, and Δ p is pixel-shift number, and f is camera focal length, and D is the distance of camera lens to scenery.
Suppose there be n node, each node needs measuring tempeature and pressure two parameters, then arrange recognition device of the present invention, node strings got up with optical fiber, each inserting knot FBG sensor, FBG
n1sensor reflected signal is connected with first 1*2 coupler input, FBG
n2the sensor reflected signal n that is connected with second 1*2 coupler input is node number; FBG
n1sensor is the sensor of measuring tempeature; FBG
n2sensor is the sensor measuring pressure.
According to Δ λ
t=λ
b× (α+ξ) Δ T and
draw temperature and pressure variation delta T to be measured and Δ P, wherein, α is thermal expansivity, and ξ is thermo-optical coeffecient,
p
12and p
11for bullet light component of tensor, υ is the Poisson ratio of fiber optic materials, and E is elastic modulus, λ
bfor the initial wavelength n of FBG
efffor being effective refraction coefficient.
As shown in Figure 2, a built-in storer in trigger of the present invention, by trigger prioritizing selection FBG signal, in information such as the position of this FBGs signal of memory recording address book stored and change times.Due to extraneous value of consult volume change time, also can there is wave length shift in corresponding FBGs, also can produce small voltage change afterwards, design trigger by change in voltage, and trigger corresponding light switching channels, record at storer the time, positional information etc. that current FBGs changes.Select corresponding FBG according to change in voltage and trigger photoswitch.
If there be m transducing signal, then on INGaAS, form the image with m hot spot, carry out the selection of FBG priority through 2*2 photoswitch and record corresponding FBG sequential and positional information etc. wherein, m equals the quantity of FBG sensor.
An application examples of the present invention, for measuring the temperature and pressure change of natural gas line, first sensor FBGs series can be pasted at rock gas tube wall, distance first grating FBG series distance very closely places the second sensor FBGs series, energy free movement, the reflected signal of first sensor is connected with first 1*2 coupler input, the reflected signal of the second sensor is connected with second 1*2 coupler input, the metal sleeve two root radiuses being 0.3mm is attached on rock gas tube wall, two optical fiber are inserted in a metal sleeve respectively, first metal sleeve is fixed, another root is at certain limit freedom of motion, two optical fiber scribe FBG sensor in same distance position, two sleeve pipe close proximity and parallel.
First sensor FBGs measurement series causes the wavelength variation values Δ λ of FBGs because of temperature variation
1, second sensor FBGs measurement series causes the twice of wavelength variation values to be designated as Δ λ because of temperature and pressure co-variation
2, then Δ λ
2-Δ λ
1for pressure change causes wave length shift value.
Therefore, the invention solves FBG sensor for temperature and pressure changes the STRESS VARIATION cross-infection phenomenon caused, can be separated simultaneously and identify two different parameters; FBG image recognition acquisition method is exactly wave length shift is become detect light spot image change in displacement, this method can not only identify multiple spot, temperature, pressure information, can space be greatly reduced, shorten recognition time, and be of practical significance to applying large-scale FBG sensing network.
Claims (4)
1. based on the temperature, pressure measurement image demodulation method of FBG sensor, it is characterized in that, two optical fiber are connected in series multiple FBGs sensor respectively, the reflected light of each FBGs sensor is first through each self-corresponding 1*2 coupling mechanism, trigger through trigger, store FBGs sensor information, then triggering selection is connected with a certain path of 2*2 photoswitch, collects in a limited plane, pool array hot spot by condenser lens again and obtained, according to formula by INGAAS imageing sensor
calculate each displacement Δ λ of FBG grating wavelength, and then identify the signal of each FBGs sensor, wherein p is Pixel Dimensions, and Δ p is pixel-shift number, and f is camera focal length, and D is the distance of camera lens to scenery.
2. according to claim 1 based on the temperature, pressure measurement image demodulation method of FBG sensor, it is characterized in that, for n node, each node needs measuring tempeature and pressure two parameters, and concrete methods of realizing is as follows: the FBG of each node of sensing unit
n1sensor reflected signal is connected with first 1*2 coupler input, FBG
n2sensor reflected signal is connected with second 1*2 coupler input, wherein: n is node number; FBG
n1sensor is the sensor of measuring tempeature; FBG
n2sensor is the sensor of measuring tempeature and pressure.
3. the temperature, pressure measurement image demodulating equipment based on FBG sensor, it is characterized in that, comprise and being parallel to each other and close two optical fiber, FBGs sensor is scribed two optical fiber same distance positions, first optical fiber is connected with first 1*2 coupler input, second optical fiber is connected with second 1*2 coupler input, the output signal of each 1*2 coupling mechanism is after the 2*2 photoswitch respective channel of trigger triggering selection, pass through condenser lens again, be fed through INGAAS imageing sensor, INGAAS imageing sensor is connected with image processing module.
4. according to claim 3 based on the temperature, pressure measurement image demodulating equipment of FBG sensor, it is characterized in that, a built-in storer in described trigger, by trigger prioritizing selection a certain road FBGs signal, in positional information and the change temporal information of this FBGs signal of memory recording address book stored.
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| CN115225148A (en) * | 2022-06-13 | 2022-10-21 | 中山水木光华电子信息科技有限公司 | Communication system and method based on space light wave identification |
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