CN2762117Y - Maze for photoelectric detector - Google Patents
Maze for photoelectric detector Download PDFInfo
- Publication number
- CN2762117Y CN2762117Y CN 200520039097 CN200520039097U CN2762117Y CN 2762117 Y CN2762117 Y CN 2762117Y CN 200520039097 CN200520039097 CN 200520039097 CN 200520039097 U CN200520039097 U CN 200520039097U CN 2762117 Y CN2762117 Y CN 2762117Y
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- CN
- China
- Prior art keywords
- cover
- labyrinth
- emission
- photodetector
- sheets
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- Expired - Lifetime
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- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model relates to a maze for a photoelectric detector, which is characterized in that the utility model is composed of countervanes, a receiving cover, a reflecting surface, an emitting cover, emitting sheets, a light-shield sheet and a dark room cover, wherein the countervanes are arranged at a circle of the edge of a shell, the light-shield sheet is arranged at the middle of two emitting sheets, the reflecting surface is formed by the two emitting sheets and the receiving cover and the emitting cover are correspondingly arranged at both sides of the two emitting sheets. The utility model has the advantages of sensitive response to invisible or black smoke particles, stable and reliable operation and high signal-to-noise ratio.
Description
Technical field
The utility model relates to a kind of labyrinth that is used for photodetector, can in time survey physics or the chemical phenomenon relevant with fire with transmission, belongs to the photodetector technical field.
Background technology
The characteristics of traditional optical detector of fire smoke are that anti-interference in air flow is more stable, environment temperature and humidity change less to its influence, to the response ratio ion smoke detector sensitivity of canescence, the smoke particle that glows that particle diameter is bigger, but to sightless or the response of black smoke particle is insensitive or do not respond.
Summary of the invention
The purpose of this utility model is that invention is a kind of to the sightless or sensitive labyrinth that is used for photodetector of black smoke particle response.
For realizing above purpose, the technical solution of the utility model provides a kind of labyrinth that is used for photodetector, it is characterized in that, by countervane, accept cover, reflecting surface, emission cover, emission sheet, anti-dazzling screen, the darkroom cover is formed, countervane is located at shell edge one circle, anti-dazzling screen is located in the middle of two emission sheets, and a sample area is formed in two emission sheet dead aheads, accepts the corresponding both sides of being located at two emission sheets of cover and emission cover.
Described countervane is L shaped;
Described two emission sheet groups are 135 ° at an angle;
Can put receiving tube in the described acceptance cover; Can put power valve in the described emission cover;
Described darkroom cover is a right cylinder.
The utility model adopts the parts of labyrinth structure in photodetector, can be to sightless or black smoke particle response sensitivity.
The output signal that photodetector photoelectricity receives is relevant with many factors, wherein except that factors such as radiation of light source power φ and wavelength, population concentration, particle diameter, complex index of refraction, scattering angle, also relevant with factors such as the light-receiving area of scattering volume, light activated element and spectral responses.In addition, this photodetector labyrinth is the forward scattering that utilizes the radiation of light source energy.Because concerning than small-particle, the maximum scattering energy of radiation energy is in the dead ahead, but this labyrinth is in cut-off state owing to the scattered-light type detector at no smoke particle time photosensitive elements, and promptly this labyrinth is by the countervane effect, making becomes the darkroom in the labyrinth, at this moment weak output signals.Smoke particle is by countervane, reflector plate, the comprehensive scattering of anti-dazzling screen when having cigarette to enter the labyrinth, make scattered signal pass through to export after detector photoelectricity is accepted, yet this labyrinth scattering volume is big, received signal also is greatly the signal to noise ratio (S/N ratio) height in this labyrinth, facilitate signal Processing like this, solve photodetector sightless or black smoke particle are responded problem insensitive or that do not respond.
The utility model has the advantages that sightless or black smoke particle response sensitivity, working stability, reliable, signal to noise ratio (S/N ratio) height.
Description of drawings
Fig. 1 is a kind of labyrinth structure synoptic diagram that is used for photodetector;
Fig. 2 is the photodetector structure synoptic diagram that is used for the labyrinth.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Embodiment
As shown in Figure 1, be a kind of labyrinth that is used for photodetector, the described labyrinth that is used for photodetector is made up of countervane 1, receiving hood 2, reflecting surface 3, emission cover 4, emission sheet 5, anti-dazzling screen 6, darkroom cover 7, darkroom cover 7 is a right cylinder, countervane 1 is L shaped, be located at shell 7 edges one circle, the both sides correspondence, anti-dazzling screen 6 is located in the middle of two emission sheets 5, receiving hood 2 and 4 groups on emission cover are 120 ° reflecting surface 3 at an angle, and receiving hood 2 and emission cover 4 correspondences are located at the both sides of two emission sheets 5.
As shown in Figure 2, for being used for the photodetector structure synoptic diagram in labyrinth, with labyrinth 8 be installed in wiring board 9 in the photodetector above, 4 li power valves 10 are installed at the emission cover, at 2 li installation receiving tubes of receiving hood.
Photelectric receiver under normal circumstances, because the resistance light action of anti-dazzling screen 6, the light beam that does not receive light emitted is that light activated element is in cut-off state, when fire takes place, the smoke particle of supervening enters detector labyrinth 8, the smoke particle that is in 8 central areas, labyrinth can be produced scattering by Infrared wavelength=900NM irradiation, and this scattering luminous energy is converted to electric signal after being received by the photoelectric diode of wiring board 9, and the size of signal is directly proportional with the smoke particle total amount that produces scattered light.Photosignal is sent into the signal processing circuit of wiring board 9 and is carried out juggling after amplifying, when soot subnumber concentration surpassed predetermined value, detector sent alerting signal to fire-alarm, and alarm lamp is lighted on the detector.
Through the smoke box test determination, the design's detector fire response lag is central value m ≈ 0.3dB/m, has higher detection sensitivity, therewith corresponding amplifier output voltage amplitude U
P≈ 2.5V.
Estimate that according to test photodiode is about 10 to the output of labyrinth inscattering cigarette
-8The A magnitude.
Suppose I
d≈ 20nA (peak value).
The conversion coefficient of current/voltage-converted circuit is designed to:
n≈10mV/1nA
The output peak value of pulse of amplifier when then smokeless:
U
I≈I
d·n＝20nA×(10mV/1nA)＝0.2V
Setting detector fire alarm threshold value is that central value is U
p≈ 2.5V, then signal to noise ratio (S/N ratio) A
2≈ U
p/ U
1=12.5 learn that according to above test and calculating the signal to noise ratio (S/N ratio) in this labyrinth is higher, also is convenient to signal Processing.
Claims (6)
1. labyrinth that is used for photodetector, it is characterized in that, cover (7) and form by countervane (1), acceptance cover (2), reflecting surface (3), emission cover (4), emission sheet (5), anti-dazzling screen (6), darkroom, countervane (1) is located at cover (7) edge, darkroom one circle, anti-dazzling screen (6) is located in the middle of two emission sheets (5), two emission sheets (5) surround a reflecting surface (3), and receiving hood (2) and emission cover (4) correspondence are located at the both sides of two emission sheets (5).
2. a kind of labyrinth that is used for photodetector according to claim 1 is characterized in that described countervane (1) is L shaped.
3. a kind of labyrinth that is used for photodetector according to claim 1 is characterized in that, described two emission sheets (5) group is 135 ° at an angle.
4. a kind of labyrinth that is used for photodetector according to claim 1 is characterized in that, receptacle can be put in described acceptance cover (2) lining.
5. a kind of labyrinth that is used for photodetector according to claim 1 is characterized in that, power valve can be put in described emission cover (4) lining.
6. a kind of labyrinth that is used for photodetector according to claim 1 is characterized in that, described darkroom cover (7) is a right cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520039097 CN2762117Y (en) | 2005-01-19 | 2005-01-19 | Maze for photoelectric detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520039097 CN2762117Y (en) | 2005-01-19 | 2005-01-19 | Maze for photoelectric detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2762117Y true CN2762117Y (en) | 2006-03-01 |
Family
ID=36095237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520039097 Expired - Lifetime CN2762117Y (en) | 2005-01-19 | 2005-01-19 | Maze for photoelectric detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2762117Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794494A (en) * | 2010-02-11 | 2010-08-04 | 河北北大青鸟环宇消防设备有限公司 | Smoke-sensing fire detector labyrinth |
| CN106441395A (en) * | 2016-11-17 | 2017-02-22 | 天津航联迪克科技有限公司 | Detachable detector for quickly changing labyrinth |
-
2005
- 2005-01-19 CN CN 200520039097 patent/CN2762117Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794494A (en) * | 2010-02-11 | 2010-08-04 | 河北北大青鸟环宇消防设备有限公司 | Smoke-sensing fire detector labyrinth |
| CN106441395A (en) * | 2016-11-17 | 2017-02-22 | 天津航联迪克科技有限公司 | Detachable detector for quickly changing labyrinth |
| CN106441395B (en) * | 2016-11-17 | 2019-03-26 | 天津航联迪克科技有限公司 | The detachable detector in quick-replaceable labyrinth |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI SONG-JIANG FEIFAN ELECTRONICS CO.,LTD |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20100519 Address after: 201600 No. 9, Ledu branch, Shanghai, Songjiang Patentee after: Shanghai Songjiang Electronic Instrument Factory Patentee after: Songjiang Feifan Electronic Co., Ltd. Address before: 201600 No. 9, Ledu branch, Shanghai, Songjiang Patentee before: Shanghai Songjiang Electronic Instrument Factory |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150119 Granted publication date: 20060301 |