CN204229571U - A kind of infrared opposite-type detector - Google Patents
A kind of infrared opposite-type detector Download PDFInfo
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- CN204229571U CN204229571U CN201420732466.6U CN201420732466U CN204229571U CN 204229571 U CN204229571 U CN 204229571U CN 201420732466 U CN201420732466 U CN 201420732466U CN 204229571 U CN204229571 U CN 204229571U
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- fresnel lenses
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Abstract
The utility model discloses a kind of infrared opposite-type detector, comprise transmitting terminal and receiving end, transmitting terminal comprises infrared emission head (41), receiving end comprises infrared receiving terminal (44), transmitting terminal adopts plano-convex lens (42), and the Infrared that infrared emission head (41) projects plano-convex lens (42) is reflected into directional light; Receiving end adopts Fresnel Lenses (43), receives above-mentioned directional light and by the directional light Refractive focusing that receives on infrared receiving terminal (44).Enforcement the beneficial effects of the utility model are, are no matter refraction loss or the light propagation loss in media as well of light, are obtained for and reduce significantly, the performance of this product of lifting, improve the stability of product.
Description
Technical field
The utility model relates to safety-security area, more particularly, relates to a kind of infrared opposite-type detector.
Background technology
Along with the foundation of China market economic system, the development of science and technology, China's security protection industry is constantly pushed ahead, and security protection market has become the hi tech market that an embodiment public safety that is emerging, that have a high potential and technical precaution are combined closely, and the development for security protection enterprise provides rare opportunity.Statistics display recent years: the security protection industry of China on average shoots up with the annual growth of 15%-30%.In burglary-resisting system in the past, generally adopt the technical measures such as pyroelectricity, microwave to gather human body invasion signal, these have good effect when indoor application, and along with the maturation of infrared technology, the application of infrared eye in safety-security area is also more and more extensive.
At present, the product of infrared eye generally comprises with individual infrared transmitter and an infrared remote receiver, and using method is generally: be installed on by infrared transmitter and need the enclosure wall of safety precaution or one end of certain area, other end installation infrared receiver.During this product work, the infrared beam that infrared transmitter sends is received by infrared remote receiver, then represent that region nobody of strick precaution or object pass.When having people or object passes, will block infrared beam, infrared remote receiver does not receive infrared beam, then trigger alarm, output signal.
The concentrating method that existing infrared opposite-type detector uses at present has two kinds, and one uses plano-convex lens, and another kind uses Fresnel Lenses.For the first, when infrared opposite-type detector works, the infrared light emission hair in transmitter goes out infrared light, through convex lens optically focused, forms a branch of parallel infrared beam, is mapped to receiver end.Whether the convex lens optically focused of light beam first in receiver, focuses on infrared light Receiver, receive normally to detect infrared light.For the second, Fresnel Lenses, has another name called Fresnel lens, and lens surface one side is light face, the ascending concentric circles of another side imprinting, and its texture to penetrate according to the interference of light and disturbing and relative sensitivity and receiving angle require to design.Principle of work is the same with plano-convex lens.The infrared light that infrared emission head sends reflects into after directional light through Fresnel Lenses and arrives infrared remote receiver.Whether Fresnel Lenses refraction in receiver again, focus on infrared receiving terminal, receive normally to detect infrared light.
But the loss that the light of current plano-convex lens infrared eye is propagated in lens medium is larger, the loss in the process being refracted as directional light of Fresnel Lenses infrared eye light is larger, therefore the detector of these two kinds of lens is all larger to the loss of light, reduces performance and the stability of detector.
Utility model content
The technical problems to be solved in the utility model is, for the above-mentioned plano-convex lens infrared eye of prior art and Fresnel Lenses infrared eye all larger to the loss of light, reduce the performance of detector and the defect of stability, the relative merits of the concentrating method that the comprehensive above infrared eye of the present invention uses, learn from other's strong points to offset one's weaknesses, a kind of infrared opposite-type detector is provided.
It is build a kind of infrared opposite-type detector that the utility model solves the technical scheme that its technical matters adopts, comprise transmitting terminal and receiving end, transmitting terminal comprises infrared emission head, receiving end comprises infrared receiving terminal, transmitting terminal adopts plano-convex lens, and Infrared infrared emission head being projected described plano-convex lens reflects into directional light; Receiving end adopts Fresnel Lenses, receives above-mentioned directional light and by the directional light Refractive focusing that receives on infrared receiving terminal.
In infrared opposite-type detector described in the utility model, the diameter of plano-convex lens is 10 millimeters to 25 millimeters.
In infrared opposite-type detector described in the utility model, the circuit of transmitting terminal comprises the infrared emission end control circuit, infrared emission head and the plano-convex lens that connect successively.
In infrared opposite-type detector described in the utility model, receiving end comprises the Fresnel Lenses, infrared receiving terminal, Received signal strength analysis circuit and the alarm output circuit that connect successively, and Received signal strength analysis circuit is also connected with automatic gain control circuit.
Implement a kind of infrared opposite-type detector of the present utility model, there is following beneficial effect: the Infrared by plano-convex lens infrared emission head being projected described plano-convex lens reflects into directional light, adopt Fresnel Lenses by above-mentioned directional light Refractive focusing on infrared receiving terminal, no matter refraction loss or the light propagation loss in media as well of light, be obtained for and reduce significantly, the performance of this product promoted, improves the stability of product.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is existing plano-convex lens infrared eye light transmition schematic diagram;
Fig. 2 is existing Fresnel Lenses infrared eye transmitting terminal light transmition schematic diagram;
Fig. 3 is existing Fresnel Lenses infrared eye transmitting terminal light transmition schematic diagram;
Fig. 4 is the utility model infrared opposite-type detector light transmition schematic diagram;
Fig. 5 is the circuit theory diagrams of this infrared opposite-type detector of the utility model.
Embodiment
In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
As shown in Figure 1, it is existing plano-convex lens infrared eye light transmition schematic diagram, when infrared opposite-type detector works, infrared light emission head 111 in transmitter 11 sends infrared light, through convex lens 112 optically focused, form a branch of parallel infrared beam, be mapped to receiver 12 end.Whether convex lens 122 optically focused of light beam first in receiver 12, focuses on infrared light Receiver 121, receive normally to detect infrared light.The advantage of which is each the tuftlet infrared light projected on convex lens, and can be refracted into directional light, refraction loss is almost 0, as long as planoconvex lens is reasonable in design.But because infrared light is when the convex lens of printing opacity are inner, can produce certain loss, lens sensitive surface is larger, then thickness is thicker, and the distance that light is propagated in lens medium is longer, and the loss of light is more.That is, the advantage of convex lens optically focused is the refraction loss theoretical value of light is 0, and the loss that light is propagated in lens medium is then that the sensitive surface of lens is larger, and thickness is larger, and light loss is larger.Because namely will consider more large area, more effective refraction infrared light, reduces light loss again, also will consider that the size of product can not be too large, so the planoconvex lens diameter of existing product all adopts 30-40mm.
Be existing Fresnel Lenses infrared eye transmitting terminal light transmition schematic diagram with reference to figure 2 and Fig. 3, Fig. 2, Fig. 3 is existing Fresnel Lenses infrared eye receiving end light transmition schematic diagram.The principle of work of Fresnel Lenses infrared eye is the same with plano-convex lens, and the infrared light that infrared emission head 21 sends reflects into after directional light through Fresnel Lenses 22 and arrives infrared receiver end.Whether in receiving end, Fresnel Lenses 32 reflects again, focuses on infrared receiving terminal 31, receive normally to detect infrared light.In Fig. 2, lines region 24 (only marking part in figure) represents that the infrared beam in this region is effectively reflected into parallel infrared light, black region 23 (only marking part in figure) then represents that the infrared light of this part can not effectively be reflected away, only lost of this part.The thickness of Fresnel Lenses is general all very thin in addition, and the distance that light is propagated in this very thin-medium is very short, so infrared light is just very little in the loss of the propagation of Fresnel Lenses inside, less than the propagation loss in plano-convex lens medium.As can be seen from 3 figure, under prerequisite reasonable in design wanted by eyeglass in theory, the parallel infrared light of each tuftlet projects after on Fresnel Lenses, can effectively be reflected, and has focused on infrared light Receiver, does not occur the refraction loss of light.So the principle of work summing up Fresnel Lenses can be found out, when transmitted beam, light beam is refracted as directional light through Fresnel Lenses, there is larger loss in refraction.And when receiving beam, Refractive focusing is carried out to directional light, the refraction loss of light is almost 0.Again because the very thin thickness of Fresnel Lenses, so light is very short in the distance of Fresnel Lenses Propagation, loss is very little.Because namely will consider more large area, more effective refraction infrared light, reduces light loss again, also will consider that the size of product can not be too large, so the Fresnel Lenses diameter of existing product all adopts 30-40mm.
With reference to figure 4, it is the utility model infrared opposite-type detector light transmition schematic diagram.Transmitting terminal adopts plano-convex lens: adopt anaclasis loss to be almost the plano-convex lens 42 of 0, in addition because light refraction is only become directional light by transmitting terminal, do not need the area considering to assemble Infrared, so the convex lens (10-25mm) adopting diameter (thickness) smaller.The propagation distance of such light in this lens medium is shorter, so the loss of light is less, only has the half of other products even less.Receiving end adopts Fresnel Lenses: receiving end end adopts anaclasis loss to be almost the Fresnel Lenses 43 of 0, and Fresnel Lenses is very thin, and light is very short in the distance of very thin Propagation, so loss is little.The light transmitted between plano-convex lens 42 and Fresnel Lenses 43 in figure only draws part, and 41 represent infrared emission head respectively, and 44 represent infrared receiving terminal respectively.Wherein, the parallel rays scope that in Fig. 4, plano-convex lens 42 reflects is less than the maximum magnitude that Fresnel Lenses 43 can receive.In other embodiments, the parallel rays scope of plano-convex lens refraction just in time can also be equal to, or greater than Fresnel Lenses receiving ability scope.
As shown in Figure 5, it is the circuit theory diagrams of this infrared opposite-type detector of the utility model.Transmitting terminal circuit comprises the infrared emission end control circuit 51, infrared emission head 52 and the plano-convex lens 53 that connect successively, the circuit of receiving end comprises the Fresnel Lenses 54, infrared receiving terminal 55, Received signal strength analysis circuit 56 and the alarm output circuit 57 that connect successively, and Received signal strength analysis circuit 56 is also connected with automatic gain control circuit 58.It is infrared light that infrared emission end control circuit 51 controls infrared emission head 52 by transform electrical signals, and the infrared light launched projects on plano-convex lens 53, by plano-convex lens 53, Infrared is reflected into directional light and sends.The directional light that Fresnel Lenses 54 receiving end/sending end sends, and after the directional light received is reflected, focus on infrared receiving terminal 55, infrared receiving terminal 55 will receive infrared light and after being transformed electric signal, Treatment Analysis is carried out by Received signal strength analysis circuit 56 pairs of above-said current signal, when above-said current signal meets certain condition, trigger alarm output circuit 57 sends alerting signal, reminds staff.Wherein, Received signal strength analysis circuit 56 pairs of electric signal carry out in Treatment Analysis process, and automatic gain control circuit carries out automatic growth control to electric signal, and the value of electric signal after treatment keeps within the specific limits.
By such combination, be no matter the refraction loss of light, or the loss that light is propagated in media as well, be obtained for and reduce significantly, improve the performance of this product, improve product and stability.
By reference to the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model aim and claim protect, also can make a lot of form, these all belong within protection of the present utility model.
Claims (4)
1. an infrared opposite-type detector, comprises transmitting terminal and receiving end, and described transmitting terminal comprises infrared emission head (41), and described receiving end comprises infrared receiving terminal (44), it is characterized in that,
Described transmitting terminal adopts plano-convex lens (42), and the Infrared that described infrared emission head (41) projects described plano-convex lens (42) is reflected into directional light;
Described receiving end adopts Fresnel Lenses (43), receives described directional light and by the directional light Refractive focusing that receives on described infrared receiving terminal (44).
2. correlative detector according to claim 1, is characterized in that, the diameter of described plano-convex lens (42) is 10 millimeters to 25 millimeters.
3. correlative detector according to claim 1, is characterized in that, the circuit of described transmitting terminal comprises the infrared emission end control circuit (51), infrared emission head (52) and the plano-convex lens (53) that connect successively.
4. correlative detector according to claim 1, it is characterized in that, the circuit of described receiving end comprises the Fresnel Lenses (54), infrared receiving terminal (55), Received signal strength analysis circuit (56) and the alarm output circuit (57) that connect successively, and Received signal strength analysis circuit (57) is also connected with automatic gain control circuit (58).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420732466.6U CN204229571U (en) | 2014-11-27 | 2014-11-27 | A kind of infrared opposite-type detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420732466.6U CN204229571U (en) | 2014-11-27 | 2014-11-27 | A kind of infrared opposite-type detector |
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| CN204229571U true CN204229571U (en) | 2015-03-25 |
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| CN201420732466.6U Expired - Fee Related CN204229571U (en) | 2014-11-27 | 2014-11-27 | A kind of infrared opposite-type detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113903132A (en) * | 2021-10-08 | 2022-01-07 | 刻锐智能科技(河源)有限公司 | High-precision infrared photoelectric fence detector |
-
2014
- 2014-11-27 CN CN201420732466.6U patent/CN204229571U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113903132A (en) * | 2021-10-08 | 2022-01-07 | 刻锐智能科技(河源)有限公司 | High-precision infrared photoelectric fence detector |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150325 Termination date: 20161127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |