CN1641318A - Optical fiber sensor based on laser feedback - Google Patents
Optical fiber sensor based on laser feedback Download PDFInfo
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- CN1641318A CN1641318A CN 200510011122 CN200510011122A CN1641318A CN 1641318 A CN1641318 A CN 1641318A CN 200510011122 CN200510011122 CN 200510011122 CN 200510011122 A CN200510011122 A CN 200510011122A CN 1641318 A CN1641318 A CN 1641318A
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Abstract
The invention is a laser feedback-based optical fiber sensor, belonging to optical instrument filed. The invention provides a simple-structured, high-precision, convenient-produced optical fiber sensor. The invention discloses a laser feedback-based optical fiber sensor, including in turn laser as a light source of optical fiber sensor, optical fiber coupling system, optical fiber and laser output power detector arranged in the laser light path; a part of the optical fiber acts as a detection region for the detected physical quantity and the ends of the optical fiber are coated with different- reflectivity films; the laser light emitted by the laser enters in the optical fiber through the optical fiber coupling system. The optical fiber sensor is simple in structure, needs fewer devices and is easier for miniaturization. The invention is an important improvement for existing optical fiber sensors and makes them more practica.
Description
Technical field
The invention belongs to optical instrument field, relate in particular to Fibre Optical Sensor.
Background technology
Optical fiber sensing technology had obtained great development in recent years, and was widely used in fields such as industry, national defence, scientific research.This technological expansion the application of optical fiber technology, driven social development in science and technology.
Fibre Optical Sensor has polytype, and common have intensity modulation optical fiber sensor, a position phase modulation fiber sensor.Intensity modulation optical fiber sensor generally is made up of elements such as light source 1, incident optical 2, outgoing optical fiber 4, detector 5, modulator zones 3, as shown in the figure.Its light source is generally light emitting diode.Pass to modulator zone 3 from the light of light source 1 outgoing through incident optical 2, measurand acts on modulator zone and causes intensity variations in the optical fiber, detects monitoring and the detection that intensity variations realizes measurand by detector 5.Position phase modulation type sensor generally is made up of laser instrument 6, beam splitter 8, reference arm optical fiber 12, gage beam optical fiber 10, detector 5, first fiber coupling system 7 and second fiber coupling system 11, as shown in Figure 2.Enter reference arm optical fiber 12 and gage beam optical fiber 10 from laser instrument 6 emitting lasers respectively through beam splitter 8, first fiber coupler 7 and second fiber coupler 11.Two optical fiber connectors can lump together, and just produce after the laser mutual superposition of output and interfere, and form interference fringe.Under the effect of measurand, phase change will take place in the light wave of propagating in the gage beam optical fiber, and the light wave stack will form different interference fringes later.With interfere measurement technique phase change is changed into Strength Changes again, just can realize the detection of generation survey physical quantity.Therefore, this class sensor generally all has interferometer.
Summary of the invention
The objective of the invention is on the basis of existing fiber sensor, a kind of Fibre Optical Sensor simple in structure is provided.This Fibre Optical Sensor does not have independently interferometer, and laser instrument itself is exactly a sensor.Precision is identical with existing Fibre Optical Sensor or higher.This sensor both can substitute common position phase sensor and common position sensor mutually, also can substitute other Fibre Optical Sensor.
The invention provides a kind of Fibre Optical Sensor based on the laser feedback benefit, so-called laser feedback effect is meant in the laser application system, the laser of laser instrument output reflected by exterior object or scattering after, wherein a part of light is reflected back laser resonant cavity (we claim that the laser of returning is feedback light outside laser chamber) again, feedback light carries exterior object information, after light in the chamber mixed mutually, the output power of laser instrument changed with strong and weak change mutually because of the position of returning the laser that comes.
The invention provides a kind of Fibre Optical Sensor based on laser feedback, it is characterized in that: described Fibre Optical Sensor comprises laser instrument, fiber coupling system, optical fiber as the Fibre Optical Sensor light source successively by laser optical path, and is arranged on the detector that is used for Laser Measurement device output power in the laser optical path; The part of described optical fiber is as the detecting area of measurand, and the end of optical fiber plates the film of different reflectivity; The laser that described laser instrument emits enters optical fiber through fiber coupling system, through described detecting area optical fiber connector by the chamber of former road reflected back laser instrument in.
As an improvement of such scheme, Fibre Optical Sensor also comprises and is arranged on being used for the beam splitter of the laser beam splitter in the light path to detector in the laser optical path.
The present invention also provides another Fibre Optical Sensor based on laser feedback, it is characterized in that: described Fibre Optical Sensor comprises laser instrument, fiber coupling system, the optical fiber of Fibre Optical Sensor light source successively by laser optical path, and be arranged on beam splitter in the laser optical path, be used for the detector of Laser Measurement device output power with the beam splitting light that receives beam splitter, the part of described optical fiber is as the detecting area of measurand; The laser that described laser instrument emits enters optical fiber through fiber coupling system, is coupled in the chamber of laser instrument through behind the described detecting area.
As an improvement of such scheme, described Fibre Optical Sensor also comprises second fiber coupling system, and the laser in process fiber-optic probe district enters second fiber coupling system, is coupled to then in the chamber of laser instrument.
The working method of Fibre Optical Sensor of the present invention is: the light that laser instrument comes out is directly coupled to optical fiber, and laser is propagated in optical fiber, and optical fiber is the device of transmission laser, also is sensor.Laser instrument be light source also be interferometer.Measurand acts directly on above the optical fiber.Last optical fiber will be passed back in the laser chamber from the laser of laser emitting.Output power by detecting laser can reach the purpose of surveying tested physics.
Optical fibre sensor structure of the present invention is simple, and required device is few, is easier to miniaturization.To the existing fiber sensor is an important improvement, makes Fibre Optical Sensor have more practicability.
Description of drawings
Fig. 1 is the structural representation of existing Modulation and Amplitude Modulation type Fibre Optical Sensor.
Fig. 2 is the structural representation of existing position phase modulation fiber sensor.
Fig. 3 is the structural representation of first embodiment of the present invention.
Fig. 4 is the structural representation of second embodiment of the present invention.
Fig. 5 is the structural representation of the 3rd embodiment of the present invention.
Fig. 6 is the structural representation of the 4th embodiment of the present invention.
Fig. 7 is the structural representation of the 5th embodiment of the present invention.
Fig. 8 is the structural representation of the 6th embodiment of the present invention.
Fig. 9 is the structural representation of the 7th embodiment of the present invention.
Embodiment
Specify embodiments of the invention below in conjunction with accompanying drawing.
As shown in Figure 3, first embodiment of Fibre Optical Sensor of the present invention is by the laser instrument 6, fiber coupling system 7, the optical fiber 14 that comprise successively by laser optical path as the Fibre Optical Sensor light source, and is arranged on the detector 5 that is used for Laser Measurement device output power in the laser optical path; The part of optical fiber 14 is as the detecting area of measurand, and the end of optical fiber 14 plates the film of different reflectivity; The laser that laser instrument 6 emits enters optical fiber 14 through fiber coupling system 7, through described detecting area optical fiber 14 ends by the chamber of former road reflected back laser instrument 6 in.Detector 5 is arranged on the output terminal of laser instrument tail light.
Fig. 4 has shown second embodiment of the present invention, is the end that detector 5 is arranged on optical fiber 14 on the basis of first embodiment that Fig. 3 shows.Optical fiber 14 has changed feedback light under external influence power and position have finally changed the output power of laser instrument 6 mutually, and detector 5 changes in the power of the terminal direct detection laser output power of optical fiber 14, can reach the purpose of measuring external physical quantity.
Fig. 5 has shown the 3rd embodiment of the present invention, is on the basis of first embodiment that Fig. 3 shows, utilizes the beam splitter 8 that (being between two lens of fiber coupling system 7) in the laser optical path is set, with the laser beam splitter in the light path to detector 5.
Fig. 6 has shown the 4th embodiment of the present invention, is on the basis of second embodiment that Fig. 4 shows, adds polaroid 15, with the performance of further raising system.
Fig. 7 has shown the 5th embodiment of the present invention, described Fibre Optical Sensor comprises laser instrument 6, fiber coupling system 7, the optical fiber 14 of Fibre Optical Sensor light source successively by laser optical path, and be arranged on beam splitter 8 in the laser optical path, be used for the detector 5 of Laser Measurement device output power with the beam splitting light that receives beam splitter 8, the part of described optical fiber 14 is as the detecting area of measurand; The laser that described laser instrument 6 emits enters optical fiber 14 through fiber coupling system 7, is coupled in the chamber of laser instrument 6 through behind the described detecting area.The laser of getting back in the chamber remains feedback light.Optical fiber 14 at temperature, pressure, reverse, under the influence of external physical quantity such as rotation, electromagnetic field, voltage, the underwater sound, the power that has changed feedback light and position finally influence the output power of laser instrument 6 mutually.Laser from the output of laser instrument tail light output end also can feed back in the laser chamber from laser output through optical fiber and fiber coupling system equally, and can change the output power of laser instrument.Beam splitter 8 is arranged between two lens of fiber coupling system 7, and to detector 5, the power of being exported by detector 5 detecting lasers changes with the laser beam splitter in the light path for it.By the output power of Laser Measurement device, just can reach the purpose of measuring external physical quantity.
Fig. 8 has shown the 6th embodiment of the present invention, the difference of the 5th embodiment that shows with Fig. 7 is: the 6th embodiment also comprises second fiber coupling system 9, and be arranged on beam splitter 8 between two lens of second fiber coupling system 9, second fiber coupling system 9 can improve the efficient of feedback, beam splitter 8 to detector 5, is changed the laser beam splitter in the light path by the power of detector 5 detecting laser output powers.
Fig. 9 has shown the 7th embodiment of the present invention, the difference of itself and the 6th embodiment showing at Fig. 8 is: beam splitter 8 is arranged between two lens of fiber coupling system 7, laser beam splitter in the light path to detector 5, is changed by the power of detector 5 detecting laser output powers.In addition, in light path, also added polaroid 15, with the performance of further raising system.
In the present invention, described laser instrument 6 can be a gas laser, as the He-Ne laser instrument, also can be solid state laser, as YAG laser instrument and semiconductor laser, also can be other various laser instruments; Described optical fiber 14 both can be that single-mode fiber also can be a multimode optical fiber; Detector 5 both can be that photoelectric cell also can be electrooptical devices such as photodiode; Fiber coupling system can be that the ordinary lens system also can be coupled systems in addition such as GRIN Lens.
In addition, in the light path of Fibre Optical Sensor of the present invention, the placement polarizer can be set, as polaroid, wave plate etc., to improve the measuring accuracy and the function of system.
Claims (10)
1. based on the Fibre Optical Sensor of laser feedback, it is characterized in that: described Fibre Optical Sensor comprises laser instrument (6), fiber coupling system (7), optical fiber (14) as the Fibre Optical Sensor light source successively by laser optical path, and is arranged on the detector (5) that is used for Laser Measurement device output power in the laser optical path; The part of described optical fiber (14) is as the detecting area of measurand, and the end of optical fiber (14) plates the film of different reflectivity; The laser that described laser instrument (6) emits enters optical fiber (14) through fiber coupling system (7), through described detecting area optical fiber (14) terminal by the chamber of former road reflected back laser instrument (6) in.
2. the Fibre Optical Sensor based on laser feedback according to claim 1 is characterized in that: described Fibre Optical Sensor also comprises and is arranged on being used for the beam splitter (8) of the laser beam splitter in the light path to detector (5) in the laser optical path.
3. the Fibre Optical Sensor based on laser feedback according to claim 1 and 2 is characterized in that: described Fibre Optical Sensor also comprise be arranged in the laser optical path in order to the measuring accuracy that improves system and the polarizer of function.
4. the Fibre Optical Sensor based on laser feedback according to claim 1 and 2 is characterized in that: described optical fiber (14) is single-mode fiber or multimode optical fiber.
5. the Fibre Optical Sensor based on laser feedback according to claim 1 and 2 is characterized in that: described detector (5) is photoelectric cell or photodiode.
6. based on the Fibre Optical Sensor of laser feedback, it is characterized in that: described Fibre Optical Sensor comprises laser instrument (6), fiber coupling system (7), the optical fiber (14) of Fibre Optical Sensor light source successively by laser optical path, and be arranged on beam splitter (8) in the laser optical path, be used for the detector (5) of Laser Measurement device output power with the beam splitting light that receives beam splitter (8), the part of described optical fiber (14) is as the detecting area of measurand; The laser that described laser instrument (6) emits enters optical fiber (14) through fiber coupling system (7), is coupled in the chamber of laser instrument (6) through behind the described detecting area.
7. the Fibre Optical Sensor based on laser feedback according to claim 6, it is characterized in that: described Fibre Optical Sensor also comprises second fiber coupling system (9), laser through optical fiber (14) detecting area enters second fiber coupling system (9), is coupled to then in the chamber of laser instrument (6).
8. according to claim 6 or 7 described Fibre Optical Sensors, it is characterized in that based on laser feedback: described Fibre Optical Sensor also comprise be arranged in the laser optical path in order to the measuring accuracy that improves system and the polarizer of function.
9. according to claim 6 or 7 described Fibre Optical Sensors based on laser feedback, it is characterized in that: described optical fiber (14) is single-mode fiber or multimode optical fiber.
10. according to claim 6 or 7 described Fibre Optical Sensors based on laser feedback, it is characterized in that: described detector (5) is photoelectric cell or photodiode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100111221A CN100363714C (en) | 2005-01-07 | 2005-01-07 | Optical fiber sensor based on laser feedback |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100111221A CN100363714C (en) | 2005-01-07 | 2005-01-07 | Optical fiber sensor based on laser feedback |
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| CN1641318A true CN1641318A (en) | 2005-07-20 |
| CN100363714C CN100363714C (en) | 2008-01-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712564A (en) * | 2014-01-03 | 2014-04-09 | 安徽理工大学 | Reflection type optical fiber displacement sensor based on Y-shaped optical fiber coupler and self-focusing lens |
| CN106159654A (en) * | 2016-08-08 | 2016-11-23 | 光惠（上海）激光科技有限公司 | The laser diode system of the band tail optical fiber that a kind of novel instruction monitoring is dual-purpose |
| JPWO2016002947A1 (en) * | 2014-07-04 | 2017-04-27 | 古河電気工業株式会社 | Optical fiber laser equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4140393A (en) * | 1976-02-23 | 1979-02-20 | University Of Arizona | Birefringent crystal thermometer |
| US4405198A (en) * | 1981-08-25 | 1983-09-20 | The United States Of America As Represented By The Secretary Of The Navy | Extended fiber optic sensor using birefringent fibers |
| JPS6050402A (en) * | 1983-08-31 | 1985-03-20 | Nec Corp | Temperature-drift compensation type fabry-perot optical fiber sensor |
| GB8400985D0 (en) * | 1984-01-14 | 1984-02-15 | Jackson D A | Polarimetric fibre sensor |
| US5218419A (en) * | 1990-03-19 | 1993-06-08 | Eli Lilly And Company | Fiberoptic interferometric sensor |
| CN1166914C (en) * | 2002-05-31 | 2004-09-15 | 清华大学 | Frequency-dividing self-mixing feedback-type non-contact He-Ne laser micrometer |
-
2005
- 2005-01-07 CN CNB2005100111221A patent/CN100363714C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712564A (en) * | 2014-01-03 | 2014-04-09 | 安徽理工大学 | Reflection type optical fiber displacement sensor based on Y-shaped optical fiber coupler and self-focusing lens |
| JPWO2016002947A1 (en) * | 2014-07-04 | 2017-04-27 | 古河電気工業株式会社 | Optical fiber laser equipment |
| CN106159654A (en) * | 2016-08-08 | 2016-11-23 | 光惠（上海）激光科技有限公司 | The laser diode system of the band tail optical fiber that a kind of novel instruction monitoring is dual-purpose |
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| Publication number | Publication date |
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| CN100363714C (en) | 2008-01-23 |
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Granted publication date: 20080123 Termination date: 20120107 |