CN201177513Y - Bidirectional interference type optical fiber sensor - Google Patents
Bidirectional interference type optical fiber sensor Download PDFInfo
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- CN201177513Y CN201177513Y CNU2008200340624U CN200820034062U CN201177513Y CN 201177513 Y CN201177513 Y CN 201177513Y CN U2008200340624 U CNU2008200340624 U CN U2008200340624U CN 200820034062 U CN200820034062 U CN 200820034062U CN 201177513 Y CN201177513 Y CN 201177513Y
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- fiber coupler
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Abstract
The utility model provides a bi-directional interference type optical fiber sensor, relating to the long distance distribution type safety monitoring engineering and equipment. The sensor has high sensitivity and can accurately position outside vibrating points. A first photoelectric detection circuit(10) and a second photoelectric detection circuit(11) are same and respectively comprises a first operational amplifier(A1), a second operational amplifier(A2), an A/D sampling module(12), a digital signal processing module(13) and a photoelectric diode(14), wherein the photoelectric diodes(14) and a third resistor (R3) are connected with an input end of the first photoelectric detection circuit(10), an output end of which are connected with the input end of the second operational amplifier (A2) by a second resistor (R2); and the output end of the second operational amplifier(A2) is connected with the A/D sampling module(12), the output end of which is connected with the digital signal processing module(13).
Description
Technical field
The utility model design belongs to Fibre Optical Sensor and protection and monitor field, relates in particular to the engineering and the equipment of long-distance distributed safety monitoring, can the vibration of monitored area be detected and locate.
Background technology
For resident residential quarter and facility's objectives with great value, such as dam, oil, natural gas line, warehouse, museum even national boundary etc., increasing to the demand of security protection.These have the facility and the target of great value, in case by undesirable's seepage failure, will cause great destruction to the people's lives and property safety and even nation's security, therefore are badly in need of carrying out effective safeguard protection.
At present, using for safety monitoring system is infrared correlation scheme more widely.Though this scheme is simple, cheap, be easy to invaded person and find, make the invador can be relatively easy to avoid the control point.Therefore this scheme is difficult to the invador is effectively monitored.In addition, also have the defence system based on " vibration wireline " or " leaky cable ", though these two kinds of schemes can solve the problem of infrared correlation scheme to a certain extent, the total system cost is higher relatively, and electronic system also is subject to extraneous interference, causes " false declaration ".
At the problems referred to above, the safety monitoring system based on optical fiber has been proposed at present.By common telecommunication optical fiber as sensor.When the external world was applied to physical quantity such as stress on the optical fiber etc. and changes, corresponding variation will take place in each parameter of the light by optical fiber such as phase place, amplitude, frequency etc.Can find out extraneous situation by monitoring these variable quantities.At present, the safety monitoring system based on optical fiber has mainly adopted based on OTDR technology and two kinds of schemes of interference technique.What at present the OTDR technology had developed is comparatively ripe, adopt the technical scheme of OTDR to be easy to realize, but this scheme sensitivity is lower, can't detect small vibration, and along with the increase of monitoring distance, its monitoring and bearing accuracy will decrease.
At the existing problem of OTDR, companies more both domestic and external and research institution have proposed a series of scheme.Optical fiber supervisory system as the proposition of Australian FFT (Future Fiber Technologies) company based on the Mach-Zehnder interferometer.But, not only increased the cost of system, and improved the difficulty of system constructing greatly owing to need when practice of construction, bury three optical fiber simultaneously underground.
Summary of the invention
Technical matters:, the utility model proposes a kind of two-way interfere type Fibre Optical Sensor at the existing problem of present security protection system.This device has very high sensitivity, and accurate localization is carried out in the oscillation point to external world.
Technical scheme: the output of the wideband light source of two-way interfere type Fibre Optical Sensor of the present utility model connects the input end of 1 * 2 fiber coupler, 1 * 2 fiber coupler, the output terminal of second photoelectric detective circuit connects the input end of the one 2 * 2 fiber coupler respectively, first photoelectric detective circuit, the output terminal of 1 * 2 fiber coupler connects the input end of the 22 * 2 fiber coupler respectively, the output terminal of the one 2 * 2 fiber coupler connects the input end of the one 1 * 2 fiber coupler by first fibre delay line, the output terminal of the 22 * 2 fiber coupler connects the input end of the 21 * 2 fiber coupler, the one 1 * 2 fiber coupler by second fibre delay line, the 21 * 2 fiber coupler is connected by sensor fibre.
First photoelectric detective circuit, second photoelectric detective circuit are identical, comprise first operational amplifier, second operational amplifier, A/D sampling module, digital signal processing module, photodiode respectively; Wherein, photodiode and the 3rd resistance connect the input end of first photoelectric detective circuit, the output terminal of first photoelectric detective circuit connects the input end of second operational amplifier by second resistance, the output termination A/D sampling module of second operational amplifier, the output termination digital signal processing module of A/D sampling module.
Disturbance Detection location, the wide territory of full optical fiber light path device based on principle of interference of the present utility model is sent into the light that wideband light source sends in the interferometer, and is sent into sensor fibre by interferometer.This light forms interference signal in another interferometer, and finally by corresponding photoelectric detective circuit identification.When disturbance takes place in the external world, such as the individual swarm into, construction and disaster etc. on every side, then corresponding the variation will take place in interference signal, thus realization is to the security protection of emphasis facility.
In above-mentioned security protection, this programme has also been realized the accurate location of disturbance point to external world.Send into broadband light simultaneously in two interferometers, two bundle broadband light go in the same direction in sensor fibre, and send into two independently in the photoelectric detective circuit by another interferometer respectively.If this moment, disturbance or intrusion behavior took place certain point in sensor fibre, then the phase place of the light by this point will change.Arrive mistiming of two interferometers by the light that calculates this generation phase change, thereby indirect known the position of disturbance point in sensor fibre.
Beneficial effect: compared with prior art, the utlity model has following advantage:
Adopted based on the principle of interfering and realized detection to invasion, highly sensitive, as outside invading person during near protection optical fiber, this system can detect the existence of invasion accurately.
Adopted two optical interference circuit designs, realized location invasion.
Only use an optical fiber to be used for sensing, not only reduced the cost of system, and simplified system's mounting hardness greatly.
Description of drawings
Fig. 1 is the utility model The general frame.Wherein have: wideband light source 7,1 * 2 fiber coupler 6, sensor fibre 5, first photoelectric detective circuit 10, second photoelectric detective circuit 11, the one 2 * 2 fiber coupler the 3, the 22 * 2 fiber coupler 8, the one 1 * 2 fiber coupler the 4, the 21 * 2 fiber coupler 9, the first fibre delay lines 1, second fibre delay line 2.
Fig. 2 is the photoelectric detective circuit theory diagram.Wherein have: first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first operational amplifier A 1, second operational amplifier A 2, capacitor C 1, A/D sampling module 12, digital signal processing module 13, photodiode 14.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
As shown in Figure 1, the light that wideband light source 7 sends is divided into two through 1 * 2 fiber coupler 6, sends into the one 2 * 2 fiber coupler 3 and the 22 * 2 fiber coupler 8 respectively simultaneously.The light of sending into the one 2 * 2 fiber coupler 3 forms in the 22 * 2 fiber coupler 8 and interferes behind sensor fibre 5.And pass through first photoelectric detective circuit 10 and realize Signal Processing.The light that the while light source is sent into the 22 * 2 fiber coupler 8 forms interference through sensor fibre 5 in the one 2 * 2 fiber coupler 3.And pass through second photoelectric detective circuit 11 and realize Signal Processing.
When disturbance takes place in certain point in the sensor fibre 5, will change through the phase place of the light of this point, then carry interferometer that the amount of changing light signal arrives and detected time of detected circuit by this disturbance point determining positions in optical fiber.Detect mistiming of external interference signal by calculating photoelectric detective circuit, can the indirect position that calculates external disturbance point.
The output of this device wideband light source 7 connects the input end of 1 * 2 fiber coupler 6,1 * 2 fiber coupler 6, the output terminal of second photoelectric detective circuit 11 connects the input end of the one 2 * 2 fiber coupler 3 respectively, first photoelectric detective circuit 10, the output terminal of 1 * 2 fiber coupler 6 connects the input end of the 22 * 2 fiber coupler 8 respectively, the output terminal of the one 2 * 2 fiber coupler 3 connects the input end of the one 1 * 2 fiber coupler 4 by first fibre delay line 1, the output terminal of the 22 * 2 fiber coupler 8 connects the input end of the 21 * 2 fiber coupler 9, the one 1 * 2 fiber coupler 4 by second fibre delay line 2, the 21 * 2 fiber coupler 9 is connected by sensor fibre 5.The broadband light of wideband light source 7 is sent into the one 2 * 2 fiber coupler 3 through the one 1 * 2 fiber coupler 6, and be divided into two in the one 2 * 2 fiber coupler 3: one road light is sent in the one 1 * 2 fiber coupler 4 through first fibre delay line 1, and another road light is directly sent in the one 1 * 2 fiber coupler 4.This two-way light is sent in the sensor fibre 5 through the one 1 * 2 fiber coupler 4.And oppositely send in the 21 * 2 fiber coupler 9 through sensor fibre 5.And once more light is divided into two, wherein a part is sent in the 22 * 2 fiber coupler 8 through second fibre delay line 2, and another part is directly sent in the 22 * 2 fiber coupler 8.Because the coherent length of wideband light source is shorter, through first fibre delay line 1 and not through the light of second fibre delay line 2 will with interfere through the light of second fibre delay line 2 not through first fibre delay line 1.This interference signal has carried the external disturbance information in the sensor fibre.Realized the sensing of disturbance to external world.
In like manner, another part broadband light of wideband light source 7 is sent into the 22 * 2 fiber coupler 8 through 1 * 2 fiber coupler 6, and be divided into two in the 22 * 2 fiber coupler 8: one road light is sent in the 21 * 2 fiber coupler 9 through second fibre delay line 2, and another road light is directly sent in the 21 * 2 fiber coupler 9.This two-way light is sent in the sensor fibre 5 through the 21 * 2 fiber coupler 9.And oppositely send in the one 1 * 2 fiber coupler 4 through sensor fibre 5.And once more light is divided into two, wherein a part is sent in the one 2 * 2 fiber coupler 3 through first fibre delay line 1, and another part is directly sent in the one 2 * 2 fiber coupler 3.Because the coherent length of wideband light source is shorter, through fibre delay line 2 and not through the light of first fibre delay line 1 will with interfere through the light of first fibre delay line 1 not through second fibre delay line 2.This interference signal has carried the external disturbance information in the sensor fibre.Realized the sensing of disturbance to external world.
As shown in Figure 2, first photoelectric detective circuit 10, second photoelectric detective circuit 11 are identical, comprise first operational amplifier A 1, second operational amplifier A 2, A/D sampling module 12, digital signal processing module 13, photodiode 14 respectively; Wherein, photodiode 14 and the 3rd resistance R 3 connect the input end of first photoelectric detective circuit 10, the output terminal of first photoelectric detective circuit 10 connects the input end of second operational amplifier A 2 by second resistance R 2, the output termination A/D sampling module 12 of second operational amplifier A 2, the output termination digital signal processing module 13 of A/D sampling module 12.Interference light is through behind the photodiode 14, and light signal becomes and is current signal.Form the mutual conductance amplifying circuit and change current signal into voltage signal by first operational amplifier A 1 and first resistance R 1, the 3rd resistance R 3.This voltage signal is sent into A/D sampling module 12 through being made up of second operational amplifier A 2, second resistance R 2, the 4th resistance R 4 and the 5th resistance R 5 after second amplifying circuit amplifies once more.A/D sampling module 12 becomes detected simulating signal to be given signal processing unit 13 after the digital signal and does the later stage signal Processing.
Claims (2)
1, a kind of two-way interfere type Fibre Optical Sensor, it is characterized in that the output of this device wideband light source (7) connects the input end of 1 * 2 fiber coupler (6), 1 * 2 fiber coupler (6), the output terminal of second photoelectric detective circuit (11) connects the input end of the one 2 * 2 fiber coupler (3) respectively, first photoelectric detective circuit (10), the output terminal of 1 * 2 fiber coupler (6) connects the input end of the 22 * 2 fiber coupler (8) respectively, the output terminal of the one 2 * 2 fiber coupler (3) connects the input end of the one 1 * 2 fiber coupler (4) by first fibre delay line (1), the output terminal of the 22 * 2 fiber coupler (8) connects the input end of the 21 * 2 fiber coupler (9), the one 1 * 2 fiber coupler (4) by second fibre delay line (2), the 21 * 2 fiber coupler (9) is connected by sensor fibre (5).
2, two-way interfere type Fibre Optical Sensor as claimed in claim 1, it is characterized in that first photoelectric detective circuit (10), second photoelectric detective circuit (11) are identical, comprise first operational amplifier (A1), second operational amplifier (A2), A/D sampling module (12), digital signal processing module (13), photodiode (14) respectively; Wherein, photodiode (14) and the 3rd resistance (R3) connect the input end of first photoelectric detective circuit (10), the output terminal of first photoelectric detective circuit (10) connects the input end of second operational amplifier (A2) by second resistance (R2), the output termination A/D sampling module (12) of second operational amplifier (A2), the output termination digital signal processing module (13) of A/D sampling module (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200340624U CN201177513Y (en) | 2008-04-11 | 2008-04-11 | Bidirectional interference type optical fiber sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200340624U CN201177513Y (en) | 2008-04-11 | 2008-04-11 | Bidirectional interference type optical fiber sensor |
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| CN201177513Y true CN201177513Y (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200340624U Expired - Fee Related CN201177513Y (en) | 2008-04-11 | 2008-04-11 | Bidirectional interference type optical fiber sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900604A (en) * | 2009-02-26 | 2010-12-01 | 维亚切斯拉夫·阿尔秋申科 | Fiber-optical probe |
| CN102128673A (en) * | 2010-09-02 | 2011-07-20 | 上海华魏光纤传感技术有限公司 | Interferometric fiber vibration sensor |
| CN101625257B (en) * | 2009-07-31 | 2012-01-18 | 复旦大学 | White light interference positioning and monitoring device and method capable of using time delay estimation |
| DE102011006441B4 (en) * | 2010-03-31 | 2021-03-25 | Ifm Electronic Gmbh | Optical sensor for automation technology (NIC) |
-
2008
- 2008-04-11 CN CNU2008200340624U patent/CN201177513Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900604A (en) * | 2009-02-26 | 2010-12-01 | 维亚切斯拉夫·阿尔秋申科 | Fiber-optical probe |
| CN101625257B (en) * | 2009-07-31 | 2012-01-18 | 复旦大学 | White light interference positioning and monitoring device and method capable of using time delay estimation |
| DE102011006441B4 (en) * | 2010-03-31 | 2021-03-25 | Ifm Electronic Gmbh | Optical sensor for automation technology (NIC) |
| CN102128673A (en) * | 2010-09-02 | 2011-07-20 | 上海华魏光纤传感技术有限公司 | Interferometric fiber vibration sensor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Yongda Technology Group Co., Ltd. Assignor: Southeast University Contract record no.: 2010320001084 Denomination of utility model: Bidirectional interference type optical fiber sensor Granted publication date: 20090107 License type: Exclusive License Record date: 20100813 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090107 Termination date: 20120411 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Yongda Technology Group Co., Ltd. Assignor: Southeast University Contract record no.: 2010320001084 Denomination of utility model: Bidirectional interference type optical fiber sensor Granted publication date: 20090107 License type: Exclusive License Record date: 20100813 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model |