CN204115854U - Based on the multichannel vibration detecting system of coherent rayleigh scattering - Google Patents
Based on the multichannel vibration detecting system of coherent rayleigh scattering Download PDFInfo
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- CN204115854U CN204115854U CN201420496773.9U CN201420496773U CN204115854U CN 204115854 U CN204115854 U CN 204115854U CN 201420496773 U CN201420496773 U CN 201420496773U CN 204115854 U CN204115854 U CN 204115854U
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Abstract
The utility model provides a kind of multichannel vibration detecting system based on coherent rayleigh scattering, for the problem lower based on capture card utilization factor in the fiber-optic vibration detection method of coherent rayleigh, detection system is improved, adopt delayer and photoswitch to stagger the time and detect the method for vibration signal in multichannel sensor fibre, by the time of control lag device, timesharing vibration detection is carried out to every bar sensor fibre, achieve the detection of Multi-channel Vibration Signals; And the capture card in detection module does not need to access pulse control signal, can carry out data acquisition in real time, improve the utilization factor of capture card within a recurrence interval.
Description
Technical field
The utility model relates to Fibre Optical Sensor signal processing technology field, particularly a kind of multichannel vibration detecting system based on coherent rayleigh scattering.
Background technology
Coherent rayleigh scattering is also called phase sensitive optical time domain reflection technology (Φ-OTDR), and the Dominant Facies of Distributed Optical Fiber Sensing Techniques and interference-type optical fiber sensing technology combines by this technology, not only achieves FR detection but also have higher sensitivity.
This technology to realize principle as follows: narrow-linewidth laser becomes pulsed light after modulator, pulsed light through amplifying enters sensor fibre, in the coherent length of light source, the rear of pulsed light is interfered mutually to Rayleigh scattering light, interference signal enters detector through circulator, the more weak needs of general interference signal, through amplifying and detecting after filtering again, then carry out the acquisition and processing of data.When there being vibration signal to act on sensor fibre, interference signal can produce larger disturbance, catches in real time thus achieve the detection & localization of vibration signal to this disturbance.
In order to improve systemic resolution, the light source pulse dutycycle after modulated device modulation is more and more less, and in order to avoid the mutual interference between laser pulse in measuring optical fiber, needs to ensure to only have a laser pulse to exist in measuring optical fiber all the time.Rayleigh scattering light is not had in optical fiber when there is no pulsed light, in order to reduce the collection of unnecessary data, usual way is by the trigger pip of modulator access capture card, triggering collection card image data when having a pulsed light, when not having a pulsed light, capture card not image data, causes the utilization ratio of capture card lower like this.Meanwhile, the vibration detection device at present based on this technology is all the corresponding sensor fibre of set of system, and for needing the region of multi-way detecting such as urban pipe network, subregion circumference security protection etc. to need to install many cover systems, cost is higher.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of multichannel vibration detecting system based on coherent rayleigh scattering, with improve based on capture card in coherent rayleigh scattering system utilization factor comparatively, realize the detection to Multi-channel Vibration Signals.
For solving the problems of the technologies described above, the utility model provides a kind of multichannel vibration detecting system based on coherent rayleigh scattering, comprise light source module, 1 × N coupling mechanism, circulator, delayer, 1 × N photoswitch and detection module, one end of the described 1 × N coupling mechanism of described light source module access, the N road output terminal of described 1 × N coupling mechanism connects described delayer and circulator respectively by sensor fibre, described circulator is connected with the N road output terminal of described 1 × N photoswitch respectively, described 1 × N photoswitch other end connects with described detection module, in described sensor fibre from sensor fibre 2 to sensor fibre N respectively successively connection delay device 1 to delayer N-1.
The utility model additionally provides the another kind of multichannel vibration detecting system based on coherent rayleigh scattering, comprise light source module, one 1 × N photoswitch, clock circuit, circulator, 21 × N photoswitch and detection module, one end of the described one 1 × N photoswitch of described light source module access, the N road output terminal of described one 1 × N photoswitch connects described circulator respectively by sensor fibre, described circulator is connected with the N road output terminal of described 21 × N photoswitch respectively, the other end of described 21 × N photoswitch connects with described detection module, described one 1 × N photoswitch is connected with described clock respectively with described 21 × N photoswitch.
Further, described light source module is connected to form by light source, modulator and amplifier order.
Further, described light source adopts narrow linewidth light source, and coherent length is greater than 100km.
Further, described detection module is connected with data processing section order by amplifier, wave filter, detector, capture card.
The multichannel vibration detecting system based on coherent rayleigh scattering that the utility model provides, the Multi-channel Vibration Signals that can realize based on coherent rayleigh scattered light detects; Meanwhile, the lower problem of the utilization factor of the capture card in the vibration detecting system based on coherent rayleigh scattered light is improved, improves the utilization factor of capture card in detection module.
Accompanying drawing explanation
The structural representation of the multichannel vibration detecting system based on coherent rayleigh scattering that Fig. 1 provides for the utility model embodiment.
Fig. 2 for the utility model embodiment provide based on sensor fibre timesharing detection ordering figure in the multichannel vibration detecting system of coherent rayleigh scattering.
The another kind that Fig. 3 provides for the utility model embodiment is based on the structural representation of the multichannel vibration detecting system of coherent rayleigh scattering.
The another kind that Fig. 4 provides for the utility model embodiment is based on sensor fibre timesharing detection ordering figure in the multichannel vibration detecting system of coherent rayleigh scattering.
Embodiment
See Fig. 1, a kind of multichannel vibration detecting system based on coherent rayleigh scattering that the utility model embodiment provides, comprise light source module, 1 × N coupling mechanism, sensor fibre, circulator, delayer, 1 × N photoswitch and detection module, one end of the described 1 × N coupling mechanism of described light source module access, the N road output terminal of described 1 × N coupling mechanism connects described delayer and circulator respectively by described sensor fibre, circulator on every bar sensor fibre is connected with the N road output terminal of described 1 × N photoswitch respectively, described 1 × N photoswitch other end connects with described detection module, in described sensor fibre from sensor fibre 2 to sensor fibre N respectively successively connection delay device 1 to delayer N-1.Wherein, light source module is connected to form by light source, modulator and amplifier order, and light source uses narrow linewidth light source, and coherent length is greater than 100km.Detection module is connected with data processing section order by amplifier, wave filter, detector, capture card.
The multichannel vibration detecting system based on coherent rayleigh scattering that the utility model embodiment provides, its principle of work and job step as follows:
Step 1: send the continuous light wave of continuous print from narrow linewidth laser and become pulsed light after modulator, the duration of pulse of pulsed light is Δ t, recurrence interval is T, dutycycle is Δ t/T, pulsed light is amplified into 1 × N fiber coupler through amplifier, is divided into N road pulsed light by 1 × N fiber coupler.
Step 2: after the delayed device of each road pulsed light and circulator in the sensor fibre of correspondence transmission produce after to Rayleigh scattering light signal.
Wherein, first via pulsed light directly enters sensor fibre 1 after circulator, and the length of sensor fibre 1 is L
1, the transmission time of pulsed light in sensor fibre 1 is t
1; Second road pulsed light delayed time was Δ t
1delayer 1 and circulator after enter sensor fibre 2, the length of sensor fibre 2 is L
2, the transmission time of pulsed light in sensor fibre 2 is t
2; 3rd road pulsed light delayed time was Δ t
2delayer 2 and circulator after enter sensor fibre 3, the length of sensor fibre 3 is L
3, the transmission time of pulsed light in sensor fibre 3 is t
3; The rest may be inferred, and the N road pulsed light delayed time is Δ t
n-1delayer N-1 and circulator after enter sensor fibre N, the length of sensor fibre N is L
n, the transmission time of pulsed light in sensor fibre N is t
n; I-th transmission time of road pulsed light in sensor fibre i calculated by formula (1).
Wherein, the transmission time of pulsed light in sensor fibre is equal with the time delay of its delayed device in corresponding sensor fibre, that is: t
1=Δ t
1, t
2=Δ t
2..., t
i=Δ t
i... t
n=Δ t
n,
In every bar sensor fibre, the transmission time of pulsed light satisfies condition:
t
1+t
2+…+t
N＝T
In formula, n is sensor fibre fiber core refractive index, L
ifor the length of sensor fibre i, c is the light velocity in vacuum, and T is the recurrence interval.
Step 3: the backward Rayleigh scattering light signal in every bar sensor fibre enters detection module after 1 × N photoswitch.Detection module is made up of amplifier, wave filter, detector, capture card and data processing.Wherein amplifier is used for faint coherent rayleigh scattered light signal to amplify, wave filter is the noise remove will produced in signal amplification process, coherent rayleigh scattered light signal is become analog electrical signal by detector, capture card transfers analog electrical signal to digital signal, data processing section is for the treatment of the signal collected, and treatment step mainly comprises signal enhancing, noise reduction, pattern-recognition etc.Come to carry out vibration detection to every bar sensor fibre respectively by delayer and 1 × N photoswitch, the timesharing realizing sensor fibre detects, St switching time between the i-th passage of 1 × N photoswitch and the i-th+1 passage
iwith the transmission time t of the i-th road pulsed light in sensor fibre i
iequal.
See Fig. 2, the timesharing vibration detection order that delayer and 1 × N photoswitch carry out every bar sensor fibre and principle as follows: the transmission time of first via pulsed light in sensor fibre 1 is t
1, at t
1in time, the capture card of detection module carries out data acquisition to sensor fibre 1; Be t through time delay
1delayer after the second road pulsed light enter sensor fibre 2, the transmission time of pulsed light in sensor fibre 2 is t
2, at t
2in time, 1 × N photoswitch is switched to the 2nd channel from the 1st channel, and the backward Rayleigh scattering light in sensor fibre 2 enters detection module, and the capture card of detection module carries out data acquisition; According to said sequence, be Δ t through time delay
i-1delayer after the i-th road pulsed light enter sensor fibre i, when there is Rayleigh scattering light in sensor fibre i, at the transmission time t of the i-th road pulsed light in sensor fibre i
iin, 1 × N photoswitch is automatically from the i-th-1 passage bridge to i passage, and the capture card in detection module carries out data acquisition to sensor fibre i, and the data processing section of module processes the data gathered after testing.
Step 4: when there being vibration signal to act on sensor fibre, there is larger disturbance in the backward Rayleigh scattering light signal in sensor fibre, catches and location thus realize the detection of vibration signal to this disturbance.
Step 5: the disturbing signal caused when different vibration events acts on sensor fibre has difference, by carrying out pattern-recognition to unlike signal thus realizing the automatic identification of vibration signal.
Come to carry out vibration detection to the timesharing of every bar sensor fibre respectively by delayer and photoswitch, capture card carries out acquisition order to the Rayleigh scattering signal in sensor fibre, and the signal between every bar sensor fibre does not interfere with each other.According to such timesharing vibration detection order and detection method, can ensure the existence having coherent rayleigh scattered light in a recurrence interval T, the capture card real-time data collection of detection module, improves the utilization factor of capture card; And the Multi-channel Vibration Signals that can realize based on coherent rayleigh scattered light detects.
See Fig. 3, the another kind that the utility model embodiment provides is based on the multichannel vibration detecting system of coherent rayleigh scattering, comprise light source module, one 1 × N photoswitch, clock circuit, sensor fibre, circulator, 21 × N photoswitch and detection module, one end of the described one 1 × N photoswitch of described light source module access, the N road output terminal of described one 1 × N photoswitch connects described circulator respectively by described sensor fibre, circulator on every article of sensor fibre is connected with the N road output terminal of described 21 × N photoswitch, described 21 × N photoswitch other end connects with described detection module, described one 1 × N photoswitch is connected with described clock circuit respectively with 21 × N photoswitch.Wherein, light source module is connected to form by light source, modulator and amplifier order, and light source uses narrow linewidth light source, and coherent length is greater than 100km.Detection module is connected with data processing section order by amplifier, wave filter, detector, capture card.
The another kind that the utility model embodiment provides based on the multichannel vibration detecting system of coherent rayleigh scattering, its principle of work and job step as follows:
Step 1: narrow linewidth laser sends the continuous light wave of continuous print and become pulsed light after modulator, duration of pulse is Δ t, recurrence interval is T, and dutycycle is Δ t/T, and the pulsed light wave after amplifier is divided into N road pulsed light to enter sensor fibre through one 1 × N photoswitch.
Step 2: pulsed light transmits after one 1 × N photoswitch and circulator in sensor fibre, the backward Rayleigh scattering light signal that pulsed light produces enters detection module through 21 × N photoswitch;
Clock circuit control one 1 × N photoswitch make pulsed light enter circulator after enter sensor fibre 1, the length of sensor fibre 1 is L
1, the transmission time of first via pulsed light in sensor fibre 1 is t
1: the backward Rayleigh scattering light signal of sensor fibre 1 li enters detection module by after 21 × N photoswitch.
See Fig. 4, through transmitting equal time t with first via pulsed light in sensor fibre 1
1afterwards, one 1 × N photoswitch and 21 × N photoswitch control simultaneously from the 1st passage bridge to the 2nd passage through clock circuit, and the second road pulsed light enters sensor fibre 2 after one 1 × N photoswitch and circulator, and the length of sensor fibre 2 is L
2, the second transmission time of road pulsed light in sensor fibre 2 was t
2, the backward Rayleigh scattering light signal of sensor fibre 2 li enters detection module by after 21 × N photoswitch.
By that analogy, when one 1 × N photoswitch and 21 × N photoswitch control to open the i-th passage through clock circuit simultaneously, the i-th road pulsed light transmits in the i-th road sensor fibre, and the length of sensor fibre i is L
i, the backward Rayleigh scattering light signal in sensor fibre i enters pick-up unit after 21 × N photoswitch,
The transmission time of backward coherent rayleigh scattered light in sensor fibre i of the i-th road pulsed light is calculated by formula (2):
And Rayleigh scattering light life period satisfies condition in every bar sensor fibre:
t
1+t
2+…+t
N＝T
That is, when one 1 × N photoswitch and 21 × N photoswitch under the control at clock circuit, time simultaneously from the i-th-1 Channel-shifted to the i-th passage, S switching time between the i-th-1 Channel-shifted to the i-th passage
tiwith the transmission time t of backward Rayleigh scattering light in sensor fibre i of the i-th road pulsed light
iequal, i.e. St
i=t
i;
Wherein, n is sensor fibre fiber core refractive index, L
ifor the length of sensor fibre i, c is the light velocity in vacuum, and T is the recurrence interval of pulsed light, i=1,2,3 ... N;
Step 3: after the backward Rayleigh scattering light signal in sensor fibre enters detection module, the capture card of detection module carries out data acquisition, the data processing division decilog of detection module is according to processing, controlled the vibration detection of each article of sensor fibre by one 1 × N photoswitch and 21 × N photoswitch, the timesharing realizing sensor fibre detects.
Step 4: when there being vibration signal to act on sensor fibre, there is larger disturbance in the backward Rayleigh scattering light signal in this sensor fibre, catches and location thus realize the detection of vibration signal to this disturbance.
Step 5: the disturbing signal caused when different vibration events acts on sensor fibre has difference, by carrying out pattern-recognition to unlike signal thus realizing the automatic identification of vibration signal.
Come to carry out vibration detection to the timesharing of every bar sensor fibre respectively by two 1 × N photoswitches, capture card carries out acquisition order to the Rayleigh scattering signal in sensor fibre, and the signal between every bar sensor fibre does not interfere with each other.According to such timesharing vibration detection order and detection method, can ensure the existence having coherent rayleigh scattered light in a recurrence interval T, the capture card real-time data collection of detection module, improves the utilization factor of capture card; And the Multi-channel Vibration Signals that can realize based on coherent rayleigh scattered light detects.
It should be noted last that, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, although be described in detail the utility model with reference to example, those of ordinary skill in the art is to be understood that, can modify to the technical solution of the utility model or equivalent replacement, and not departing from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (5)
1. the multichannel vibration detecting system based on coherent rayleigh scattering, it is characterized in that: comprise light source module, 1 × N coupling mechanism, circulator, delayer, 1 × N photoswitch and detection module, one end of the described 1 × N coupling mechanism of described light source module access, the N road output terminal of described 1 × N coupling mechanism connects described delayer and circulator respectively by sensor fibre, described circulator is connected with the N road output terminal of described 1 × N photoswitch respectively, described 1 × N photoswitch other end connects with described detection module, in described sensor fibre from sensor fibre 2 to sensor fibre N respectively successively connection delay device 1 to delayer N-1.
2. the multichannel vibration detecting system based on coherent rayleigh scattering, it is characterized in that: comprise light source module, one 1 × N photoswitch, clock circuit, circulator, 21 × N photoswitch and detection module, one end of the described one 1 × N photoswitch of described light source module access, the N road output terminal of described one 1 × N photoswitch connects described circulator respectively by sensor fibre, described circulator is connected with the N road output terminal of described 21 × N photoswitch respectively, the other end of described 21 × N photoswitch connects with described detection module, described one 1 × N photoswitch is connected with described clock respectively with described 21 × N photoswitch.
3. detection system according to claim 1 and 2, is characterized in that: described light source module is connected to form by light source, modulator and amplifier order.
4. detection system according to claim 3, is characterized in that: described light source adopts narrow linewidth light source, and coherent length is greater than 100km.
5. detection system according to claim 1 and 2, is characterized in that: described detection module is connected with data processing section order by amplifier, wave filter, detector, capture card.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106840360A (en) * | 2017-01-18 | 2017-06-13 | 辽宁达能电气股份有限公司 | Distributed optical fiber vibration detection means and method based on Sobel operators |
| CN108896160A (en) * | 2015-05-27 | 2018-11-27 | 三峡大学 | A kind of fiber grating sound sensor-based system method for sensing |
| CN109883348A (en) * | 2019-03-14 | 2019-06-14 | 哈尔滨工程大学 | A kind of PDH multisensor strain gauge means using pseudo noise code code division multiplexing |
| CN110987038A (en) * | 2019-12-17 | 2020-04-10 | 南京曦光信息科技有限公司 | Distributed optical fiber disturbance detection device |
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2014
- 2014-08-29 CN CN201420496773.9U patent/CN204115854U/en active Active
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| CN108896160A (en) * | 2015-05-27 | 2018-11-27 | 三峡大学 | A kind of fiber grating sound sensor-based system method for sensing |
| CN108896160B (en) * | 2015-05-27 | 2021-04-02 | 三峡大学 | Sensing method of fiber bragg grating ground sound sensing system |
| CN106840360A (en) * | 2017-01-18 | 2017-06-13 | 辽宁达能电气股份有限公司 | Distributed optical fiber vibration detection means and method based on Sobel operators |
| CN109883348A (en) * | 2019-03-14 | 2019-06-14 | 哈尔滨工程大学 | A kind of PDH multisensor strain gauge means using pseudo noise code code division multiplexing |
| CN109883348B (en) * | 2019-03-14 | 2021-01-12 | 哈尔滨工程大学 | PDH multi-sensor strain measuring device using pseudo-random code division multiplexing |
| CN110987038A (en) * | 2019-12-17 | 2020-04-10 | 南京曦光信息科技有限公司 | Distributed optical fiber disturbance detection device |
| CN110987038B (en) * | 2019-12-17 | 2021-12-07 | 南京曦光信息科技有限公司 | Distributed optical fiber disturbance detection device |
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Effective date of registration: 20211227 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PETROCHINA Co.,Ltd. |
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