CN203551109U - Ultraviolet detection sensor - Google Patents
Ultraviolet detection sensor Download PDFInfo
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- CN203551109U CN203551109U CN201320759333.3U CN201320759333U CN203551109U CN 203551109 U CN203551109 U CN 203551109U CN 201320759333 U CN201320759333 U CN 201320759333U CN 203551109 U CN203551109 U CN 203551109U
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- ultraviolet
- anode
- photocathode
- housing
- detection sensor
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Abstract
The utility model relates to the sensor field and discloses an ultraviolet detection sensor. The ultraviolet detection sensor includes a shell through which ultraviolet can passes, an anode, an anode lead wire, a cathode lead wire, and a photoelectric cathode which can generate an photoelectric effect under the irradiation of the ultraviolet; the anode is connected with the anode lead wire; the shell, the anode and the photoelectric cathode are all hemisphere-shaped; the anode is located at the center of the lower part of the shell; the photoelectric cathode is of a film layer-shaped structure and is fittingly attached to the inner surface of the shell; the diameter of the anode is larger than the diameter of the shell by 1/3; a conductive net is arranged between the inner surface of the shell and the photoelectric cathode; and the conductive net is connected with the cathode lead wire. The sensor can accurately detect the presence of the ultraviolet, and can be used for aspects such as ultraviolet protection and flame detection.
Description
Technical field
The utility model relates to sensor field, especially a kind of ultraviolet detection sensor.
Background technology
Ultraviolet ray is the general name of electromagnetic wave spectrum medium wavelength from 10nm to 400nm radiation.At occurring in nature, main ultraviolet light source is the sun, and the ultraviolet ray that when sunshine sees through atmospheric envelope, wavelength is shorter than 290nm rice is absorbed by the ozonosphere in atmospheric envelope.Ultraviolet ray has chemical action can make photographic negative sensitization, and fluorescence is strong, and daylight lamp and various fluorescent light are all luminous with ultraviolet ray excited fluorescent material.Ultraviolet ray can also be false proof, and ultraviolet ray also has physiological action, energy sterilization, sterilization, treatment skin disease and osteomalacia etc.Ultraviolet corpuscular property is stronger, can make various metals produce photoelectric effect.But, irradiate too much ultraviolet ray meeting health is produced to harm greatly, as injury eyes, make skin produce erythema, even bring out cutaneum carcinoma.So, uitraviolet intensity is surveyed very important very important in daily life.
In industrial circle, various heating furnace and boilers take fuel oil, combustion gas, coal dust as fuel, if it is unsuccessful to light a fire, or when normal combustion, because certain is former thereby died, if fuel shutoff not in time now, just may cause flame-out after because continuing to drop into the explosion accident that fuel causes.Therefore, must effectively detect the state of flame (catch fire or stop working), provide in time warning message to guarantee safety in production.The method of flame detection is a lot, as temperature detection, UV detection, infrared detection, and visible detection and ion detection etc.The ultraviolet ray that flame during due to various fuel combustion sends is all very strong, once and fray-out of flame, ultraviolet ray disappears immediately.Therefore with surveying ultraviolet ray, to carry out the method reliability of flame detection high, and be not subject to visible ray and ultrared impact.Ultraviolet detection sensor of the prior art its to measure ultraviolet source direction limited, can not meet production, live required.
Utility model content
Technical problem to be solved in the utility model is to provide a kind ofly can measure the wider ultraviolet ultraviolet detection sensor of source direction.
Ultraviolet detection sensor disclosed in the utility model, comprise and can see through ultraviolet housing, anode, plate lead, cathode leg and can irradiate and issue raw photoelectric photocathode in ultraviolet ray, described anode is connected with plate lead, described housing, anode and photocathode are semisphere, described anode is positioned at lower housing portion center, described photocathode is membrane stratiform structure and fits in shell inner surface, the diameter of described anode is greater than 1/3rd of diameter of the housing, between described shell inner surface and photocathode, be provided with conductive mesh, described conductive mesh is connected with cathode leg.
Preferably, described shell is filled with inert gas.
Preferably, described housing is made by quartz glass.
Preferably, described photocathode is tellurium caesium photocathode.
Preferably, described anode hollow hemisphere shape.
The beneficial effects of the utility model are: in this ultraviolet detection sensor, the area of photocathode is large, are easily subject to extraneous ultraviolet ray and irradiate, thereby can measure the wider ultraviolet ray of source direction; Anode surface area is large, and nearer apart from photocathode, can absorb well the photoelectron that photocathode produces; The setting of conductive mesh can make ultraviolet ray affected penetrating hardly, can overcome photocathode poorly conductive again and the adverse effect brought.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
Mark in figure: 1 is housing, 2 is photocathode, and 3 is anode, and 4 is conductive mesh, and 5 is plate lead, 6 is cathode leg.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further illustrated.
As shown in Figure 1, ultraviolet detection sensor disclosed in the utility model, comprise and can see through ultraviolet housing 1, anode 3, plate lead 5, cathode leg 6 and can irradiate and issue raw photoelectric photocathode 2 in ultraviolet ray, described anode 3 is connected with plate lead 5, described housing 1, anode 3 and photocathode 2 are semisphere, described anode 3 is positioned at housing 1 lower central, described photocathode 2 is for membrane stratiform structure and fit in housing 1 inside surface, the diameter of described anode 3 is greater than 1/3rd of housing 1 diameter, between described housing 1 inside surface and photocathode 2, be provided with conductive mesh 4, described conductive mesh 4 is connected with cathode leg 6.Ultraviolet detection sensor all seals conventionally, is generally vacuum or is filled with inert gas in housing 1.Housing 1 is generally made by transparent material, preferably selects the material that ultraviolet transmittance is high, can select the materials such as quartz glass, sapphire, magnesium fluoride, lithium fluoride; Thereby described photocathode 2, under ultraviolet irradiation, photoelectric effect electron emission can occur, generally by alkaline metal or alkali metal alloy, made; And the electric conductivity of considering many photocathodes 2 is poor, between described housing 1 inside surface and photocathode 2, be provided with conductive mesh 4, conductive mesh 4 can not cause large loss and can guarantee the good transmission of electric current ultraviolet ray.Housing 1 is semisphere, is easy to see through the ultraviolet ray from surrounding, and photocathode 2 is for membrane stratiform structure and fit in housing 1 inside surface, be conducive to photocathode 2 to receive the ultraviolet ray from surrounding, and inside utilizing emitted light electronics.Anode 3 is for semisphere and be positioned at housing 1 lower central, it is consistent that the photoelectron that photocathode 2 is launched is getted over distance, the diameter of anode 3 is greater than 1/3rd of housing 1 diameter, the semispherical surface of anode 3 is long-pending larger like this, be conducive to receive photoelectron, and make photoelectronic get over distance shorter, the sensitivity that can improve ultraviolet detection sensor.When work, first at plate lead 5, add positive voltage, at cathode leg 6, add negative voltage, when having ultraviolet ray to irradiate, ultraviolet ray sees through housing 1 and conductive mesh 4 is irradiated on photocathode 2, thereby there is photoelectric effect utilizing emitted light electronics in photocathode 2, photoelectron, because the effect anode 3 of electric field force moves, is absorbed by anode 3, thus generation current, due to voltage effect, there is again electronics to move to the loss of electrons that photocathode 2 supplements photocathode 2 simultaneously.Ultraviolet intensity is higher, and the photoelectron that in the unit interval, photocathode 2 produces is just more, and the electric current that flows through ultraviolet detection sensor is just larger, thereby realized UV sensor, surveys ultraviolet function.
If in housing 1 be vacuum, when weak ultraviolet ray is irradiated, flow through the less difficult detection of electric current of UV sensor, so, as optimal way, in described housing 1, be filled with inert gas.The moving process of photoelectron from photocathode 2 to anode 3, meeting bumps with the gas atom in housing 1, thereby produce ionization, the electronics being produced by ionization is all received by anode together with photoelectron, positive ion but counter motion is received by photocathode 2, to flow through the electric current of ultraviolet detection sensor larger.Can not there is not chemical reaction with photocathode 2 or anode 3 in inert gas, thereby improve the serviceable life of detector.
General material transmission of ultraviolet rays is all not too high, and the ultraviolet transmittance of quartz glass is very high, so as optimal way, described housing 1 is made by quartz glass.Be conducive to like this ultraviolet ray and penetrate housing 1 and produce photoelectric effect with photocathode 2, make ultraviolet detection sensor there is higher sensitivity.
At ultraviolet detection sensor when as flame combustions such as fire, need to get rid of the impact of available light, and being shorter than the solar radiation of 290nm, wavelength absorbed by atmospheric envelope, so want flame detection combustion position best detection wavelength to be shorter than the ultraviolet ray of 290nm, otherwise will be subject to the impact of sunshine, so as optimal way, described photocathode is tellurium caesium photocathode.Tellurium caesium photocathode material therefor is Cs2Te, and about 250nm of photoelectric best ultraviolet wavelength occurs for it, can avoid preferably the impact of available light middle-ultraviolet lamp for flame detection.
Because in ultraviolet detection sensor, anode is larger, solid if, waste undoubtedly material, increase unnecessary weight, so, as optimal way, described anode hollow hemisphere shape.So neither can affect the transmission of electric current, and alleviate the weight of ultraviolet detection sensor, also save cost.
Claims (5)
1. ultraviolet detection sensor, comprise and can see through ultraviolet housing (1), anode (3), plate lead (5), cathode leg (6) and can irradiate and issue raw photoelectric photocathode (2) in ultraviolet ray, described anode (3) is connected with plate lead (5), it is characterized in that: described housing (1), anode (3) and photocathode (2) are semisphere, described anode (3) is positioned at housing (1) lower central, described photocathode (2) is for membrane stratiform structure and fit in housing (1) inside surface, the diameter of described anode (3) is greater than 1/3rd of housing (1) diameter, between described housing (1) inside surface and photocathode (2), be provided with conductive mesh (4), described conductive mesh (4) is connected with cathode leg (6).
2. ultraviolet detection sensor as claimed in claim 1, is characterized in that: described housing is filled with inert gas in (1).
3. ultraviolet detection sensor as claimed in claim 1, is characterized in that: described housing (1) is made by quartz glass.
4. ultraviolet detection sensor as claimed in claim 1, is characterized in that: described photocathode (2) is tellurium caesium photocathode.
5. ultraviolet detection sensor as claimed in claim 1, is characterized in that: described anode (3) hollow hemisphere shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320759333.3U CN203551109U (en) | 2013-11-26 | 2013-11-26 | Ultraviolet detection sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320759333.3U CN203551109U (en) | 2013-11-26 | 2013-11-26 | Ultraviolet detection sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203551109U true CN203551109U (en) | 2014-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320759333.3U Withdrawn - After Issue CN203551109U (en) | 2013-11-26 | 2013-11-26 | Ultraviolet detection sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203551109U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604497A (en) * | 2013-11-26 | 2014-02-26 | 四川天微电子有限责任公司 | Ultraviolet light detection sensor |
| CN105684122A (en) * | 2013-11-01 | 2016-06-15 | 浜松光子学株式会社 | Transmission photocathode |
-
2013
- 2013-11-26 CN CN201320759333.3U patent/CN203551109U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105684122A (en) * | 2013-11-01 | 2016-06-15 | 浜松光子学株式会社 | Transmission photocathode |
| US9824844B2 (en) | 2013-11-01 | 2017-11-21 | Hamamatsu Photonics K.K. | Transmission mode photocathode |
| CN105684122B (en) * | 2013-11-01 | 2018-01-05 | 浜松光子学株式会社 | Infiltration type photocathode |
| CN103604497A (en) * | 2013-11-26 | 2014-02-26 | 四川天微电子有限责任公司 | Ultraviolet light detection sensor |
| CN103604497B (en) * | 2013-11-26 | 2015-04-08 | 四川天微电子有限责任公司 | Ultraviolet light detection sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140416 Effective date of abandoning: 20150408 |
|
| RGAV | Abandon patent right to avoid regrant |