CN103090967B - Strong light protecting module of photoelectric detection device - Google Patents
Strong light protecting module of photoelectric detection device Download PDFInfo
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- CN103090967B CN103090967B CN201310005072.0A CN201310005072A CN103090967B CN 103090967 B CN103090967 B CN 103090967B CN 201310005072 A CN201310005072 A CN 201310005072A CN 103090967 B CN103090967 B CN 103090967B
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- photoswitch
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Abstract
A strong light protecting module of a photoelectric detection device comprises a photoswitch, a photoelectric detection device and a control circuit. The photoswitch receives optical signals. The input end of the photoelectric detection device is connected with the output end of the photoswitch and the received optical signals are transformed to electrical signals through the photoelectric detection device. The input end of the control circuit is connected with the output end of the photoelectric detection device, and the signals from the photoelectric detection device are processed through the control circuit. By means of the strong light protecting module of the photoelectric detection device, the optical signals arriving at the surface of the photoelectric detection device are directly processed, the photoswitch is adopted so as to achieve filter function of the nonworking wavelength and time division on-off of the working wavelength, so that the system is enabled to be compact and simple and easy to integrate. The strong light protection of the receiving end of the photoelectric detection device is effectively carried out, and reliability and practicability of an optical module are improved.
Description
Technical field
The present invention relates to a kind of high light protection module for Electro-Optical Sensor Set; it adopts light to open the light to carry out high light protection to the receiving end of Photodetection system; restraint speckle (comprising ground unrest, the echo of interference noise, closely decoy, the scattering interference etc. of air), and useful signal is differentiated from interference emission.
Background technology
Photoswitch is the Primary Component of all-optical network of new generation, utilizes advanced optoelectronic integrated technology, realizes optical signal switch rapidly, can be used for realizing the light on-off action of a road light signal and the passage bridge of multipath light signal.In light protection system, optical-fiber network test and monitor system, there is widespread use, be applicable to long distance, strong electromagnetic and, ground the various environment such as to bury underground in the air under water.Photoswitch choosing wavelength wide ranges, switching speed is fast, has undershoot insertion loss, reliable and stable.
Photodetection mainly exactly receives light signal, then light signal is converted to electric signal, uses correlation technique by signal extraction out afterwards.Because the signal received often has more than comprise required signal, also can comprise some undesired signals, these undesired signals are called as noise, and noise comprises noise that is outside and system self.Therefore, how required signal is extracted from noise and just seem most important.At present, develop some relevant technology and be applied to photodetection.The method telling signal from interference emission has usually, visual field method, spectrally resolved method, video bandwidth method, time resolution method etc.Visual field method mainly suppresses a part of background radiation by the method reducing field of view of receiver angle, but the too little meeting in field of view of receiver angle makes aiming, tracking and collimation that difficulty occur, and Received signal strength is weakened.The method that spectrally resolved method reduces optical filter bandwidth carrys out Background suppression radiation.Time resolution is mainly used to the interference suppressing closely decoy.
In actual application, when receiving end receives very strong light signal, often cause the breakdown damage of optical fiber receive module because receiving terminal circuit lacks high voltage protective measure, thus cause optical module fault, have impact on the normal operation of whole detection system.
Summary of the invention
The object of the invention is to, provide a kind of high light protection module of Photodetection system receiving end, it is in conjunction with spectrally resolved method and time resolution method, utilizes the excellent characteristic of photoswitch to be applied to the high light protection of the receiving end of Photodetection system.The protection of major part high light improves the circuit of Photodetection system rear end, to reach the object of high light protection, increases the complicacy of system.It directly processes the light signal arriving photodetector surfaces; adopt photoswitch can realize strobing to inoperative wavelength simultaneously; and have timesharing break-make to operation wavelength; make system more compact; be easy to integrated; effectively high light protection is carried out to the receiving end of Photodetection system, improve the dependable with function of optical module.
The present invention relates to a kind of high light protection module of Photodetection system receiving end, comprising: a photoswitch, this photoswitch receiving optical signals; One Electro-Optical Sensor Set, the input end of this Electro-Optical Sensor Set is connected with the output terminal of photoswitch, transfers the light signal received to electric signal; One control circuit, the input end of this control circuit is connected with the output terminal of Electro-Optical Sensor Set, and control circuit processes the signal that Electro-Optical Sensor Set is sent.
The invention has the beneficial effects as follows:
1. the present invention realizes high light protection by adopting photoswitch, and photoswitch realizes filtering and time resolution effect simultaneously.
2. utilize photoswitch to realize time resolution effect, realize compared with the work of classic method-utilize rear end and control circuit, reduce the complexity of work and control circuit, have that debugging is convenient, the advantage of stable performance.
3. photoswitch can be integrated with Photodetection system receiving end, reduces system bulk, improves portability and the reliability of system.
4. photoswitch can accurately select effective light signal, is applicable to any number of operation wavelength and works simultaneously, improves the tunability of system.The spectrally resolved method of traditional approach adopts the coating of optical lens method to receiving end, is suitable for for single operation wavelength, more restricted to the mode of multiple operation wavelength.
Accompanying drawing explanation
For further illustrating concrete technology contents of the present invention, below in conjunction with drawings and Examples, the present invention will be further described, wherein:
Fig. 1 is structured flowchart of the present invention;
Fig. 2 mems optical switch high light protection duty one, spectrally resolved functional realiey high light protection
Fig. 3 mems optical switch high light protection duty two, time resolution functional realiey high light is protected
Embodiment
Refer to shown in Fig. 1, the invention provides a kind of high light protection module 10 of Photodetection system receiving end, comprising:
One photoswitch 1, this photoswitch 1 receiving optical signals;
One Electro-Optical Sensor Set 2, the input end of this Electro-Optical Sensor Set 2 is connected with the output terminal of photoswitch 1, transfers the light signal received to electric signal;
One control circuit 3, the input end of this control circuit 3 is connected with the output terminal of Electro-Optical Sensor Set 2, and control circuit processes the signal that Electro-Optical Sensor Set 2 is sent.
Described photoswitch 1 pair of light signal carries out fast conducting and shutoff, and optical signal switch 1 response time is from Millisecond to femtosecond.
Described photoswitch 1 is that mechanical optical switch is outer, magneto-optic shutter, M-Z type interfere type photoswitch, thermo-optical switch, acoustooptic switch, liquid crystal optical switch or mems optical switch.
Described photoswitch 1 pair of inoperative wavelength channels realizes filter action, selects the operation wavelength of needs, is transformed into another optical channel or directly turns off by an optical channel.
The open the light receiving end of 1 pair of Photodetection system of described light carries out high light protection, restraint speckle (comprising ground unrest, the echo of interference noise, closely decoy, the scattering interference etc. of air), and differentiates useful signal from interference emission.
Described photoswitch 1 pair of inoperative wavelength channels realizes filter action, selects the operation wavelength (i.e. effective light signal) of needs, is transformed into another optical channel or directly turns off by an optical channel;
Described photoswitch 1 pair of operation wavelength plays time resolution effect, carries out timesharing break-make to operation wavelength, realizes high light protection.Range gating is carried out to the echo interference of in-plant decoy, to the optical signal turn-off of closely angel echoes, just starts open-minded until transponder pulse leaves a certain minor increment.
Described Electro-Optical Sensor Set 2 is photodiode, phototriode, photomultiplier, avalanche photodide, enhancement mode photodiode, microchannel plate, microsphere plate, vacuum avalanche photodide or single-photon detector.
The present invention utilizes photoswitch, realizes spectrally resolved method and time resolution method simultaneously, directly processes the light signal arriving photodetector surfaces, utilizes photoswitch to realize the high light protection of the receiving end of Photodetection system.
The present invention adopts light to open the light to carry out high light protection, restraint speckle (comprising ground unrest, the echo of interference noise, closely decoy, the scattering interference etc. of air) to the receiving end of Photodetection system, and differentiates useful signal from interference emission.The present invention, in conjunction with spectrally resolved method and time resolution method, utilizes photoswitch to realize the high light protection of the receiving end of Photodetection system.The protection of major part high light improves the circuit of Photodetection system rear end, to reach the object of high light protection, which increases the complicacy of system.The present invention directly processes the light signal arriving photodetector surfaces; adopt the filter action of photoswitch realization to inoperative wavelength; select the operation wavelength (i.e. effective light signal) of needs, and timesharing break-make is carried out to operation wavelength, realize high light protection.High light guard method provided by the invention makes Photodetection system more compact, is easy to integrated, effectively carries out high light protection to the receiving end of Photodetection system, improves the dependable with function of optical module.
The present invention is applicable to the high light protection of the receiving end of range finding, radar, remote sensing etc., is not limited to the application of above several respects.
The kind of photoswitch is a lot, except traditional mechanical optical switch, also has magneto-optic shutter, M-Z type interfere type photoswitch, thermo-optical switch, acoustooptic switch, liquid crystal shutter, mems switch etc.This example is for micromirror reflects formula mems switch, and describe and how to protect with the high light that photoswitch realizes in photodetection, photoswitch realizes filtering and time resolution effect simultaneously.
The flashlight that target object returns incides the receiving end of Photodetection system, and receiving end detects rear output electric pulse, and working control circuit carries out the process such as amplification to electric pulse, finally the signal value of display measurement in terminal.Wherein, the photoswitch be placed on before the receiving end of Photodetection system is that receiving end selects suitable effective light signal; directly the light signal arriving photodetector surfaces is processed; to strobing of inoperative wavelength; select the operation wavelength (i.e. effective light signal) of needs; and timesharing break-make is carried out to operation wavelength, realize high light protection.
Example 1:
This example for two-dimensional reflective 4X4 type mems optical switch, wherein λ
1, λ
2, λ
3for inoperative wavelength, λ
4for operation wavelength.Fig. 2 and Fig. 3 is two different operating states of photoswitch in this example respectively.Fig. 2 is mems optical switch high light protection duty one, spectrally resolved functional realiey high light protection.Fig. 3 is mems optical switch high light protection duty two, and time resolution functional realiey high light is protected.
Mems optical switch is easy to integrated and controls, and the micro mirror of two-dimentional photoswitch and light path are in same plane, and micro mirror opens or closes two states, make its folded light beam any input beam can be coupled as output signal by the catoptron of mobile appropriate location.The MEMS micromirror matrix of a N × N is used for connecting N bar input light path and N bar output light path, and this structure is N
2structure.Its control circuit is fairly simple, and generally only needing provides enough driving voltages to make micro mirror generation action.In two-dimensional photoswitch, the mode of motion of micro mirror mainly contains Pop-up, torsional mode and slidingtype.When light opens the light work, its driving pulse voltage-drop loading is on the microlens array of photoswitch, slidably driver moves to brace summer, hinge between brace summer and micro mirror is fastened, hinged micro-reflector is lifted to the position vertical with surface from substrate surface, realizes the conversion of light path at pass-through state and reflective condition.
In this example, mems optical switch directly processes the light signal arriving photodetector surfaces.In fig. 2, mems optical switch in running order, spectrally resolved effect realizes high light protection.Now, to inoperative wavelength X
1, λ
2, λ
3, its control circuit makes the lenticule in photoswitch be in reflective condition, and light path is by inoperative wavelength X
1, λ
2, λ
3proceed to and give up end, play filter action.The light path of operation wavelength λ 4 is in pass-through state, by effective light signal λ
4deliver to output terminal, select the operation wavelength of needs.This duty realizes the highlight protection function to the filtering of inoperative wavelength.In figure 3, mems optical switch in running order two, time resolution effect realizes high light protection.Now, operation wavelength λ
4light path on lenticule rise; timesharing break-make is carried out to operation wavelength; range gating is carried out to the echo interference of in-plant decoy; to the optical signal turn-off of closely angel echoes; just start open-minded until transponder pulse leaves a certain minor increment, realize time-resolved highlight protection function.
Although illustrate and describe the present invention here in the context of the embodiment of limited quantity, within the spirit not departing from essential characteristic of the present invention, the present invention can be implemented in a variety of forms.Such as; the two-dimensional adopted in example reflective 4X4 type mems optical switch; also can realize with three-dimensional MEMS photoswitch or NXN type photoswitch; and use the photoswitch of other types; as magneto-optic shutter, M-Z type interfere type photoswitch, thermo-optical switch, acoustooptic switch, liquid crystal shutter realize highlight protection function, be applied to the high light protection of range finding, radar, remote sensing receiving end.Therefore, generally say, illustrate and the embodiment described will think illustrate but as restriction.Therefore, additional claims and not only represent scope of the present invention by instructions above, it is desirable to will comprise all changes within the meaning that is equal to by claims at this and scope.
Claims (5)
1. a high light protection module for Photodetection system receiving end, comprising:
One photoswitch, this photoswitch receiving optical signals;
One Electro-Optical Sensor Set, the input end of this Electro-Optical Sensor Set is connected with the output terminal of photoswitch, transfers the light signal received to electric signal;
One control circuit, the input end of this control circuit is connected with the output terminal of Electro-Optical Sensor Set, and control circuit processes the signal that Electro-Optical Sensor Set is sent;
Described photoswitch carries out high light protection to the receiving end of Photodetection system, and restraint speckle comprises ground unrest, the echo of interference noise, closely decoy, the scattering interference of air, and differentiates useful signal from interference emission;
Described photoswitch realizes filter action to inoperative wavelength channels, selects the operation wavelength of needs and effective light signal, is transformed into another optical channel or directly turns off by an optical channel;
Described photoswitch plays time resolution effect to operation wavelength, timesharing break-make is carried out to operation wavelength, realize high light protection, range gating is carried out to the echo interference of in-plant decoy, to the optical signal turn-off of closely angel echoes, just start open-minded until transponder pulse leaves a certain minor increment;
Photoswitch realizes spectrally resolved method and time resolution method simultaneously, directly processes the light signal arriving photodetector surfaces, utilizes photoswitch to realize the high light protection of the receiving end of Photodetection system.
2. the high light protection module of Photodetection system receiving end according to claim 1, wherein said photoswitch carries out fast conducting and shutoff to light signal, and the optical signal switch response time is from Millisecond to femtosecond.
3. the high light protection module of Photodetection system receiving end according to claim 2, wherein said photoswitch is that mechanical optical switch is outer, magneto-optic shutter, M-Z type interfere type photoswitch, thermo-optical switch, acoustooptic switch, liquid crystal optical switch or mems optical switch.
4. the high light protection module of Photodetection system receiving end according to claim 3, wherein said photoswitch realizes filter action to inoperative wavelength channels, selects the operation wavelength of needs, is transformed into another optical channel or directly turns off by an optical channel.
5. the high light protection module of Photodetection system receiving end according to claim 1, wherein said Electro-Optical Sensor Set is photodiode, phototriode, photomultiplier, avalanche photodide, enhancement mode photodiode, microchannel plate, microsphere plate, vacuum avalanche photodide or single-photon detector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310005072.0A CN103090967B (en) | 2013-01-08 | 2013-01-08 | Strong light protecting module of photoelectric detection device |
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| CN201310005072.0A CN103090967B (en) | 2013-01-08 | 2013-01-08 | Strong light protecting module of photoelectric detection device |
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| CN103090967B true CN103090967B (en) | 2015-07-15 |
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| CN109444826A (en) * | 2018-11-15 | 2019-03-08 | 深圳市速腾聚创科技有限公司 | Receiving device receives system and laser radar |
| CN109781253A (en) * | 2019-01-24 | 2019-05-21 | 中国科学院理化技术研究所 | A kind of light beam synchronizing detection device |
| CN113324650A (en) * | 2020-10-28 | 2021-08-31 | 浙江大学 | Illumination intensity self-adaptive optical receiving end |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61202105A (en) * | 1985-03-05 | 1986-09-06 | Matsushita Electric Ind Co Ltd | Photosensor |
| JP2739847B2 (en) * | 1995-09-21 | 1998-04-15 | 日本電気株式会社 | Burst optical amplifier |
| CN101673935A (en) * | 2009-09-25 | 2010-03-17 | 上海华魏光纤传感技术有限公司 | Protecting device of light receiving circuit |
| CN102075242A (en) * | 2010-12-14 | 2011-05-25 | 上海光家仪器仪表有限公司 | Loss analysis device of passive device |
| US9204800B2 (en) * | 2011-03-07 | 2015-12-08 | St. Jude Medical, Inc. | Low cost high efficiency signal interrogation for multi-channel optical coherence tomography |
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