CN101750634A - Optical detection system - Google Patents
Optical detection system Download PDFInfo
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- CN101750634A CN101750634A CN200810207372A CN200810207372A CN101750634A CN 101750634 A CN101750634 A CN 101750634A CN 200810207372 A CN200810207372 A CN 200810207372A CN 200810207372 A CN200810207372 A CN 200810207372A CN 101750634 A CN101750634 A CN 101750634A
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Abstract
The invention relates to an optical detection system, which consists of a light source, an optical connector, an optical detector, an optical fiber, an optical lens and a reflecting device. Light emitted from the light source is incident in the optical fiber after passing through the optical connector, then, the light is propagated by the optical fiber and emergent from the end of the optical fiber; and then, the light emergent from the optical fiber is refracted by the optical lens onto the reflecting device; the end of the optical fiber is positioned at a focal plane of the optical lens, the light reflected back by the reflecting device is refracted by the optical lens again and then incident in the optical fiber, then the reflected light is transmitted into the optical detector after passing through the optical connector; the optical detector receives the reflected light under normal conditions, when a space beam between the optical lens and the reflecting device is blocked, the optical detector cannot receive the reflected light, and gives out a warning signal. The system is not required to supply power to a transmission line and a remote terminal of the system, has no external signal interference in the process of signal transmission, and can use a plurality of probes to form a monitoring network by using mature optical multiplexing technology.
Description
Technical field
The present invention relates to photodetection, particularly relate to a kind of system that utilizes optical passive component to survey, be used for the monitoring of switching value.
Background technology
The monitoring of many switching values is arranged in actual engineering,, even comprise that the application of some counters crosses vehicle count etc. such as path link such as the super water-level alarm in some worker's wells, the warning of gate inhibition's switch etc.In application of practical project, often occur owing to be detected and a little mostly be in larger distance or be distributed in the bigger scope, as spread all over entire city or be in intercity, if adopt conventional electrical formula sensor to survey, can bring monitoring point powerup issue along the line and signal transmission issues.In the electric power system of long distance, need long service cable and various voltage conversion apparatus, engineering more complicated and cost costliness.And the long Distance Transmission of traditional electric sensor signal needs concentric cable to add multistage multiplying arrangement, equally also has the bigger problem of cost.Unless therefore outside the position of particular importance, these objects are not carried out special monitoring usually.
Under some special occasion as the forceful electric power cable tunnel in or some to the very responsive warehouse of external electric, oil depot, arsenal etc., the transmission of electric sensor and electric signal is all inapplicable.
Equally, in existing safety-protection system, infrared correlation sensor is generally adopted in intrusion detection, thus the invasion object by the time infrared signal that can cause blocking-up provide intrusion alarm.But existing infrared correlation sensor equally also can run into the problem of above-mentioned power supply, occurs because power supply can't supportingly cause many assemblies of final system and the situation that function can't realize through regular meeting.
Summary of the invention
The objective of the invention is to overcome above shortcomings in the above-mentioned prior art, a kind of optical detection system is provided.Utilize detection system of the present invention, under distance situation far away, realize the effect of the light passive detection amount of opening the light, reduce the danger of surveying simultaneously.
Technical scheme provided by the invention is as follows:
A kind of optical detection system, it is characterized in that this system is made up of light source, optical connector, photo-detector, signal processing unit, optical fiber, lens and reflection device, the light that is sent by light source is incident in the optical fiber through described optical connector, via spread fiber, in the optic fibre end outgoing; The light of outgoing is again through lens refraction back extremely on the described reflection device in the optical fiber; Described optic fibre end is positioned at the place, focal plane of lens, the light of described reflection device reflected back, again after the lens refraction, be incident in the optical fiber, reflected light reaches in the photo-detector through optical connector, and described photo-detector receives reflected light under normal condition, when the spatial beam between described lens and the described reflection device is blocked, photo-detector can not receive reflected light, provides alerting signal.
Described light source is laser instrument or is light emitting diode.
Described optical connector is a photo-coupler or for optical circulator or for the light beam splitter.
Described photo-detector is photodiode or is photoresistance.
Described lens are the optics simple lens or are the lens combination that a plurality of lens are formed.
Described lens are non-spherical lens or are GRIN Lens.
Described optical fiber is single-mode fiber or is multimode optical fiber.
The angle of described optic fibre end polishing is 0 ° or is 8 °.
Described reflection device is a reflecting optics or for pyramid or for the pyramid array.
Described reflection device is lens and the combination that is positioned at the reflecting optics at its place, focal plane.
Described reflection device is the GRIN Lens of 0.25 pitch, is coated with high-reflecting film at an one end face.
Based on technique scheme, the present invention has brought following technological merit than prior art:
The optical signals Optical Fiber Transmission that light source sends is to monitoring far-end, scioptics change the light in the optical fiber into space parallel light, transfer to reflection device then, reflection device is with the former road of light beam reflected back, scioptics enter in the optical fiber and are transmitted through the fiber in the photo-detector again, like this under normal condition, can there be fixing light signal to reach photo-detector always, in the time of between external object is through lens and reflection device, can cause light path to be blocked, so just do not have light signal back light detector, after circuit judges, reach the purpose of sensing.
The present invention has not only realized the function same with the conventional electrical sensor-based system, and in transmission route, reach system's far-end and all do not need power supply, the signal transmission is not disturbed by external signal, utilizes ripe recovery can utilize a plurality of probes to form monitor network with technology, therefore has great advantage.
Description of drawings
Fig. 1 is embodiment 1 structural representation of a kind of optical detection system of the present invention.
Fig. 2 is embodiment 2 structural representations of a kind of optical detection system of the present invention.
Fig. 3 is embodiment 3 structural representations of a kind of optical detection system of the present invention.
Fig. 4 is embodiment 4 structural representations of a kind of optical detection system of the present invention.
Wherein,
0.25 pitch GRIN Lens of an end face plating of oblique 8 ° of optic fibre end 12-cemented doublet 13-pyramid 14-photo resistance 15-laser instrument 16-beam splitter 17-multimode fibre 18-the first simple lens 19-second simple lens 20-thin film 21-GRIN Lens 22-of 1-light emitting diode 2-fiber coupler 3-single-mode fiber 4-optic fibre end 5-aspherical plastic lens 6-reflecting optics 7-photodiode 8-signal processing unit 9-laser diode 10-optical circulator 11-high-reflecting film
Embodiment
Come a kind of optical detection system of the present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment, but can not limit protection scope of the present invention with this.
Basic structure of the present invention comprises light source, optical connector, photo-detector, optical fiber, lens and reflection device.
The light that is sent by light source is incident in the optical fiber through described optical connector, via spread fiber, in the optic fibre end outgoing to air.The diverging light of outgoing becomes directional light to described reflection device again in the optical fiber after the lens refraction.After reaching the diverging light outgoing, become directional light, described optic fibre end is arranged in the place, focal plane of lens.Reflection device will be penetrated the directional light that comes and reflect back according to original light path, and the light of reflected back is propagated in optic fibre end is incident to optical fiber after the lens refraction, and the reflected light in optical fiber reaches in the photo-detector through optical connector.Described photo-detector receives reflected light under normal condition, when the spatial beam between described lens and the described reflection device was blocked, photo-detector can not receive reflected light, provides alerting signal, effectively substitutes as a kind of of switch amount monitoring.
Present embodiment 5km place, the pulpit worker down-hole facility that is used for realizing adjusting the distance carries out intrusion detection and warning.
In the present embodiment structure of optical detection system as shown in Figure 1, Fig. 1 is embodiment 1 structural representation of a kind of optical detection system of the present invention.As seen from the figure, it is that the light emitting diode 1 of 1550nm is as light source that the present invention has adopted operation wavelength, its infrared light that sends transfers to far-end through fiber coupler 2 and single-mode fiber 3, become parallel beam or approximate parallel beam in the space through the diverging light of optic fibre end 4 outgoing by aspherical plastic lens 5, reflecting optics 6 returns beam reflection to aspherical plastic lens 5, and be incident to optic fibre end 4 again and transmit back into optical fibers coupling mechanisms 2 and receive by photodiode 7 again along single-mode fiber 3, change corresponding electric signal into, signal processing unit 8 carries out this electric signal to provide the instruction of whether reporting to the police after size is judged.
Under normal state, have the light back light detector of constant intensity, therefore constant electric signal output arranged, when the space optical path between lens and the reflection device is blocked, the light signal that returns reduces greatly, therefore the electric signal of photodiode output also reduces greatly, by signal judging circuit, just can obtain outside invading information.
Present embodiment is used in the detection of long distance invasion, and can integrated a plurality of probes carries out multiplexingly, and then forms complete monitor network, not only can successfully produce a desired effect.And relatively the time, also has very big cost advantage with traditional intrusion detection method.
Fig. 2 is embodiment 2 structural representations of a kind of optical detection system of the present invention.Present embodiment is used for monitoring the water level of station in the tunnel that reaches 7Km.It adopted operation wavelength be the laser diode 9 of 1310nm as light source, its laser that sends transfers to the detection far-end by single-mode fiber 3 behind optical circulator 10.The light that single-mode fiber 3 is propagated becomes approximate parallel beam in the space through the diverging light of optic fibre end 11 outgoing of 8 ° of polishings by cemented doublet 12, pyramid 13 returns beam reflection to cemented doublet 12, and be incident to the optic fibre end 11 of 8 ° of polishings again and receive along single-mode fiber 3 transmission light echo circulators 10 and by photoresistance 14, the signal that receives provides warning message after decision circuitry.
Fig. 3 is embodiment 3 structural representations of a kind of optical detection system of the present invention.The light that laser instrument 15 sends enters multimode optical fiber 17 via beam splitter 16 rear sections, the diverging light that send multimode optical fiber 17 terminations becomes spatial beam behind first simple lens 18, second simple lens 19 focuses on this spatial beam on the reflector plate 20, reflector plate 20 returns beam reflection and returns by entering behind second simple lens 19 and first simple lens 18 in the multimode optical fiber 17 and along multimode optical fiber 17 former roads successively, by beam splitter 16 part optical signals is transferred to photodiode 7, and realize the alerting signal processing by decision circuitry.
Fig. 4 is embodiment 4 synoptic diagram of a kind of optical detection system of the present invention.Structure and the principle of work of present embodiment and embodiment 2 are basic identical, difference is: the lens that the diverging light that optical fiber is penetrated becomes the space parallel light beam are that 0.25 pitch GRIN Lens 22 of 21, one end faces platings of GRIN Lens high-reflecting film is as reflection device.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.
Claims (10)
1. optical detection system, it is characterized in that this system is made up of light source, optical connector, photo-detector, signal processing unit, optical fiber, lens and reflection device, the light that is sent by light source is incident in the optical fiber through described optical connector, via spread fiber, in the optic fibre end outgoing; The light of outgoing is again through lens refraction back extremely on the described reflection device in the optical fiber; Described optic fibre end is positioned at the place, focal plane of lens, and the light of described reflection device reflected back after the lens refraction, is incident in the optical fiber again, and reflected light reaches in the photo-detector through optical connector.
2. a kind of optical detection system according to claim 1 is characterized in that, described light source is laser instrument or is light emitting diode.
3. a kind of optical detection system according to claim 1 is characterized in that, described optical connector is a photo-coupler or for optical circulator or for the light beam splitter.
4. a kind of optical detection system according to claim 1 is characterized in that, described photo-detector is photodiode or is photoresistance.
5. a kind of optical detection system according to claim 1 is characterized in that, described lens are the optics simple lens or are the lens combination that a plurality of lens are formed.
6. a kind of optical detection system according to claim 1 is characterized in that, described lens are non-spherical lens or are GRIN Lens.
7. according to claim 1 or 7 described a kind of optical detection systems, it is characterized in that the angle of described optic fibre end polishing is 0 ° or is 8 °.
8. a kind of optical detection system according to claim 1 is characterized in that, described reflection device is a reflecting optics or for pyramid or for the pyramid array.
9. a kind of optical detection system according to claim 1 is characterized in that, described reflection device is lens and the combination that is positioned at the reflecting optics at its place, focal plane.
10. a kind of optical detection system according to claim 1 is characterized in that, described reflection device is the GRIN Lens of 0.25 pitch, is coated with high-reflecting film at an one end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810207372A CN101750634A (en) | 2008-12-19 | 2008-12-19 | Optical detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810207372A CN101750634A (en) | 2008-12-19 | 2008-12-19 | Optical detection system |
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| CN101750634A true CN101750634A (en) | 2010-06-23 |
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| CN200810207372A Pending CN101750634A (en) | 2008-12-19 | 2008-12-19 | Optical detection system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103209022A (en) * | 2013-02-22 | 2013-07-17 | 江苏海虹电子有限公司 | Space optic coupling detection device based on optical fiber arrays |
| CN103808407A (en) * | 2012-11-08 | 2014-05-21 | 李品德 | Visible light sensor with multiple probes and optical fibers |
| CN103905795A (en) * | 2014-04-15 | 2014-07-02 | 吴江市赛纳电子科技有限公司 | Self-photographing surveillance camera |
| GB2547649A (en) * | 2016-02-23 | 2017-08-30 | Bae Systems Plc | Optical security detector |
| CN108444527A (en) * | 2018-03-21 | 2018-08-24 | 国网江苏省电力有限公司无锡供电分公司 | A kind of anti-landfill monitoring device of electric power inspection shaft and system |
| CN109343363A (en) * | 2018-10-30 | 2019-02-15 | 清华大学 | Movement TT&C system based on optical oomputing |
| WO2019071685A1 (en) * | 2017-10-10 | 2019-04-18 | 昂纳信息技术（深圳）有限公司 | By such means, not only is electrode resistance reduced, thus increasing cathode resistivity, reducing panel heat generation, and reducing power consumption, but packaging effects also are enhanced. |
| CN110310465A (en) * | 2019-06-17 | 2019-10-08 | 深圳晶点光科有限公司 | A kind of band light splitting optical fiber does the optical fiber manual fire alarm call point of signal designation |
-
2008
- 2008-12-19 CN CN200810207372A patent/CN101750634A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808407A (en) * | 2012-11-08 | 2014-05-21 | 李品德 | Visible light sensor with multiple probes and optical fibers |
| CN103209022A (en) * | 2013-02-22 | 2013-07-17 | 江苏海虹电子有限公司 | Space optic coupling detection device based on optical fiber arrays |
| CN103209022B (en) * | 2013-02-22 | 2016-05-25 | 江苏海虹电子有限公司 | Space optical coupling sniffer based on fiber array |
| CN103905795A (en) * | 2014-04-15 | 2014-07-02 | 吴江市赛纳电子科技有限公司 | Self-photographing surveillance camera |
| GB2547649A (en) * | 2016-02-23 | 2017-08-30 | Bae Systems Plc | Optical security detector |
| WO2019071685A1 (en) * | 2017-10-10 | 2019-04-18 | 昂纳信息技术（深圳）有限公司 | By such means, not only is electrode resistance reduced, thus increasing cathode resistivity, reducing panel heat generation, and reducing power consumption, but packaging effects also are enhanced. |
| CN108444527A (en) * | 2018-03-21 | 2018-08-24 | 国网江苏省电力有限公司无锡供电分公司 | A kind of anti-landfill monitoring device of electric power inspection shaft and system |
| CN109343363A (en) * | 2018-10-30 | 2019-02-15 | 清华大学 | Movement TT&C system based on optical oomputing |
| CN110310465A (en) * | 2019-06-17 | 2019-10-08 | 深圳晶点光科有限公司 | A kind of band light splitting optical fiber does the optical fiber manual fire alarm call point of signal designation |
| CN110310465B (en) * | 2019-06-17 | 2024-04-19 | 浙江东方职业技术学院 | Optical fiber manual fire alarm button with light splitting optical fiber as signal indication |
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Application publication date: 20100623 |