CN101782661A - Method for adjusting sensitivity of infrared curtain detector and infrared curtain detector - Google Patents
Method for adjusting sensitivity of infrared curtain detector and infrared curtain detector Download PDFInfo
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- CN101782661A CN101782661A CN200910190390A CN200910190390A CN101782661A CN 101782661 A CN101782661 A CN 101782661A CN 200910190390 A CN200910190390 A CN 200910190390A CN 200910190390 A CN200910190390 A CN 200910190390A CN 101782661 A CN101782661 A CN 101782661A
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Abstract
The invention discloses a method for adjusting the sensitivity of an infrared curtain detector and the infrared curtain detector, relating to the field of infrared detection. An effective area that an infrared signal passes through of at least one Fresnel lens monomer near the middle part of a Fresnel lens assembly is shielded by a method of arranging a shielding sheet. The detector comprises a pyroelectric infrared sensor and the Fresnel lens assembly, wherein the Fresnel lens assembly comprises a plurality of Fresnel lens monomers which are equal in focal length and area; and the shielding sheet is arranged to shield the infrared signal passing through at least one Fresnel lens monomer near the middle part of the Fresnel lens assembly. The invention has the advantages that: the method is simple; and the infrared curtain detector has compact structure, can realize similar sensitivity of all detection distances and well solves the problems that the distance is easy to report by mistake and the near and far distance fails to be reported easily in the infrared curtain detector of the prior art.
Description
Technical field
The present invention relates to the infrared acquisition field, refer to regulate the method for sensitivity of infrared curtain detector and relevant infrared curtain detector thereof especially.
Background technology
Infrared curtain detector is a kind of general safety detection device of using, and mainly is installed in window or balcony etc. and is easy to scurry into the place and is used for surveying to monitor whether human body invasion crime is arranged.The infrared curtain detector of prior art generally comprises Fresnel Lenses, pyroelectric infrared sensor and the relevant circuit of curtain-type, and the infrared ray of radiation is realized surveying when passing through the infrared vision area of curtain-type by detecting mobile human body.When human body passed through the infrared vision area of curtain-type, Fresnel Lenses focused on pyroelectric infrared sensor with the infrared ray of human body radiation, produced corresponding electric signal, sent alerting signal through processing of circuit again.
As shown in Figure 1, 2, at present, adopt the Fresnel Lenses of equidistant segmentation at the most of infrared curtain detector that uses on the market, this type of lens cheapness, versatility is wide, and the angle of search coverage is all identical.
But, the infrared curtain detector of prior art when human body from distance Fresnel Lenses different distance by (in the investigative range of setting), far away, in, closely the time, the sensitivity difference of infrared curtain detector is bigger.As shown in Figure 2, closely during a, human body can only occupy a zone, and human body occupies two zones during middle distance b, and human body occupies a zone during remote c.Can find out thus that middle distance b sensitivity is higher causes wrong report easily, and near, remote on the low side the causing easily of sensitivity failed to report.
There is the understanding of sensitivity defective inequality for the ease of infrared curtain detector, specially is specifically described in conjunction with Fig. 1,2 to prior art:
The search coverage vertical view that Fig. 1 forms for Fresnel Lenses.
The search coverage side view that forms for Fresnel Lenses as Fig. 2, when human body in search coverage from Fresnel Lenses closely during a, the occupied search coverage number of human body is 1; When human body in search coverage during from Fresnel Lenses middle distance b, the occupied search coverage number of human body is 2; When human body when search coverage is near from Fresnel Lenses, remote, the occupied search coverage number of human body is 1.
As seen, in search coverage human body near from Fresnel Lenses, in, down remote, the number of detection areas difference that human body is occupied causes sensitivity inequality, the many persons of number of detection areas that human body is occupied, it is highly sensitive accordingly.The activity of a same human body, near in search coverage from Fresnel Lenses, in, down remote because the sensitivity difference, Fresnel Lenses offers the infrared signal amount difference of pyroelectric infrared sensor, thereby produces different result of detections.Therefore, the infrared curtain detector of prior art needs to be resolved hurrily because of the different problems that influence the result of detection accuracy of sensitivity.
Summary of the invention
The infrared curtain detector that the present invention is intended to overcome prior art in search coverage human body sensitivity simultaneously is different and cause the inaccurate defective of result of detection from the nearly medium and long distance of Fresnel Lenses, release method and a kind of infrared curtain detector of regulating sensitivity of infrared curtain detector.This method of regulating sensitivity of infrared curtain detector is easy, can obtain close sensitivity on the different detection ranges of search coverage.This a kind of infrared curtain detector uses the method for regulating sensitivity of infrared curtain detector, can obtain close sensitivity on the different detection ranges of search coverage, and the accuracy of result of detection is improved, and can reduce even avoid wrong report or fail to report phenomenon.
For this reason, to regulate the technical scheme of the method for sensitivity of infrared curtain detector and a kind of infrared curtain detector as follows in the present invention.
The present invention regulates the method for sensitivity of infrared curtain detector, adopt the Fresnel Lenses assembly that the infrared signal of the detected object of search coverage is focused on pyroelectric infrared sensor, described Fresnel Lenses assembly comprises the Fresnel Lenses monomer that the multi-disc focal length is identical and area equates; Employing is provided with the method that infrared ray is had a shielding plate of the effect of blocking the useful area that passes through infrared signal by the described Fresnel Lenses monomer of a slice at least of middle part of described Fresnel Lenses assembly is carried out partial occlusion (undoubtedly, described shielding plate can not block whole described Fresnel Lenses monomers, if not, infrared curtain detector has just become " blind person ").
Described shielding plate is close to or the close described Fresnel Lenses monomer of a slice at least by the middle part that is arranged at described Fresnel Lenses assembly.
Described shielding plate can be arranged at the side by pyroelectric infrared sensor of the described Fresnel Lenses monomer of a slice at least that leans on the middle part of described Fresnel Lenses assembly, or the opposite side of described Fresnel Lenses monomer.
A kind of infrared curtain detector of the present invention comprises pyroelectric infrared sensor and Fresnel Lenses assembly, and described Fresnel Lenses assembly comprises the Fresnel Lenses monomer that the multi-disc focal length is identical and area equates; Pyroelectric infrared sensor is arranged on the focus of described Fresnel Lenses assembly; The shielding plate that infrared ray is had the effect of blocking is set, the infrared signal by the described Fresnel Lenses monomer of a slice at least of middle part by described Fresnel Lenses assembly is blocked.
A kind of infrared curtain detector of the present invention, described shielding plate are close to or the close described Fresnel Lenses monomer of a slice at least by the middle part that is arranged at described Fresnel Lenses assembly.
A kind of infrared curtain detector of the present invention, described shielding plate can be arranged at the side by pyroelectric infrared sensor of the described Fresnel Lenses monomer of a slice at least that leans on the middle part of described Fresnel Lenses assembly, or the opposite side of Fresnel Lenses monomer.
A kind of infrared curtain detector of the present invention, the described Fresnel Lenses monomer of multi-disc is arranged at least one row's cambered surface, and every row's described Fresnel Lenses monomer is close to each other composes and lay out, and is close to each other between each row that described Fresnel Lenses monomer is lined up and composes and lay out.
Described Fresnel Lenses assembly is anchored on the Fresnel Lenses assembly support, and described shielding plate and described Fresnel Lenses assembly support are fastenedly connected or are overall shaped into one.
Described shielding plate is made of heat-resisting ABS plastic.
Described Fresnel Lenses monomer is made of polythene PE.
The present invention regulates method and a kind of infrared curtain detector of sensitivity of infrared curtain detector, compare with prior art, its beneficial effect is: the method for one, the useful area by blocking described Fresnel Lenses assembly, the infrared energy that arrives pyroelectric infrared sensor is decayed, described Fresnel Lenses monomer shielded area by the middle part is more, the described Fresnel Lenses monomer shielded area at two ends is less or do not block, realized the adjusting to sensitivity of infrared curtain detector, its method is simple.Two, as long as suitable to the relevant described Fresnel Lenses monomer shielded area in the described Fresnel Lenses assembly, the sensitivity that just can reach each distance is close, solves the problem that existing infrared curtain detector middle distance is reported by mistake easily, failed to report easily closely at a distance.Three, described shielding plate and described Fresnel Lenses assembly support are fastenedly connected or are overall shaped into one, can reduce the quantity of part, make compact conformation, and cost reduces.Its four, described shielding plate and described Fresnel Lenses monomer are close to, and can prevent that described shielding plate from moving, with the stability that guarantees a kind of infrared curtain detector performance of the present invention and the homogeneity of sensitivity.
Description of drawings
Search coverage that Fig. 1 forms for the prior art Fresnel Lenses and human body apart from the distance of Fresnel Lenses for closely, middle distance, remote vertical view.
Search coverage angle that Fig. 2 forms for the prior art Fresnel Lenses and human body apart from the distance of Fresnel Lenses for closely, middle distance, remote side view.
Fig. 3 is a kind of infrared curtain detector synoptic diagram of the present invention.
Fig. 4 is a kind of infrared curtain detector decomposing schematic representation of the present invention.
Fig. 5 is Fresnel Lenses assembly and the shielding plate decomposing schematic representation of a kind of embodiment.
Fig. 6 is Fresnel Lenses assembly that assembles and the shielding plate synoptic diagram of a kind of embodiment.
Fig. 7 is one of schematic diagram of the present invention (dash area represent the useful area of Fresnel Lenses monomer be blocked a part).
Fig. 8 is two (useful area by middle Fresnel Lenses monomer is blocked morely, both sides be blocked fewly) of schematic diagram of the present invention.
Among the figure: 1, pyroelectric infrared sensor; 2, Fresnel Lenses assembly; 3, Fresnel Lenses assembly support; 4, shielding plate; 5, gap; 1., first Fresnel Lenses monomer; 2., second Fresnel Lenses monomer; 3., the 3rd Fresnel Lenses monomer; 4., the 4th Fresnel Lenses monomer; 5., the 5th Fresnel Lenses monomer; 6., the 6th Fresnel Lenses monomer; 7., the 7th Fresnel Lenses monomer; 8., the 8th Fresnel Lenses monomer; 9., the 9th Fresnel Lenses monomer; 10., the tenth Fresnel Lenses monomer;
The tenth a slice Fresnel Lenses monomer;
The 12 Fresnel Lenses monomer;
The 13 Fresnel Lenses monomer; A, human body are apart from Fresnel Lenses closely; B, human body are apart from the Fresnel Lenses middle distance; C, human body are remote apart from Fresnel Lenses.
Embodiment
Below, introduce the specific embodiment of the present invention in conjunction with the accompanying drawings.
The present invention regulates the method for sensitivity of infrared curtain detector, adopt Fresnel Lenses assembly 2 that the infrared signal of the detected object of search coverage is focused on pyroelectric infrared sensor 1, described Fresnel Lenses assembly 2 comprises the Fresnel Lenses monomer that the multi-disc focal length is identical and area equates; Employing is provided with the method that infrared ray is had a shielding plate 4 of the effect of blocking the useful area that passes through infrared signal by the described Fresnel Lenses monomer of a slice at least of middle part of described Fresnel Lenses assembly 2 is carried out partial occlusion (Fig. 7, Fig. 8).
Described shielding plate 4 is close to or the close described Fresnel Lenses monomer of a slice at least by the middle part that is arranged at described Fresnel Lenses assembly 2.
Described shielding plate 4 can be arranged at the side (as Fig. 4) by pyroelectric infrared sensor 1 of the described Fresnel Lenses monomer of a slice at least that leans on the middle part of described Fresnel Lenses assembly 2, or the opposite side of described Fresnel Lenses monomer.
A kind of infrared curtain detector of the present invention comprises pyroelectric infrared sensor 1 and Fresnel Lenses assembly 2, and described Fresnel Lenses assembly 2 comprises the Fresnel Lenses monomer that the multi-disc focal length is identical and area equates; Pyroelectric infrared sensor 1 is arranged on the focus of described Fresnel Lenses assembly 2; The shielding plate 4 that infrared ray is had the effect of blocking is set, the useful area that passes through infrared signal by the described Fresnel Lenses monomer of a slice at least of middle part of described Fresnel Lenses assembly 2 is blocked.
A kind of infrared curtain detector of the present invention, described shielding plate 4 are close to or the close described Fresnel Lenses monomer of a slice at least by the middle part that is arranged at described Fresnel Lenses assembly 2.
A kind of infrared curtain detector of the present invention, described shielding plate 4 can be arranged at the side (as Fig. 4) by pyroelectric infrared sensor 1 of the described Fresnel Lenses monomer of a slice at least that leans on the middle part of described Fresnel Lenses assembly 2, or the opposite side of described Fresnel Lenses monomer.
A kind of infrared curtain detector of the present invention, the described Fresnel Lenses monomer of multi-disc is arranged at least one row's cambered surface, and every row's described Fresnel Lenses monomer is close to each other composes and lay out, and is close to each other between each row that described Fresnel Lenses monomer is lined up and composes and lay out.
Described Fresnel Lenses assembly 2 is anchored on Fresnel Lenses assembly support 3, and described shielding plate 4 is fastenedly connected or is overall shaped into one with described Fresnel Lenses assembly support 3.
The heat-resisting ABS plastic of described shielding plate 4 usefulness is made.
Described Fresnel Lenses monomer adopts circular design.
Described Fresnel Lenses monomer is made of polythene PE.
Shown in Fig. 5,6, as an embodiment, described Fresnel Lenses assembly 2 is made up of the described Fresnel Lenses monomer that 13 parfocals and area equate, 13 described Fresnel Lenses monomers are composed and laid out into two rows, wherein a row by second Fresnel Lenses monomer 2., the 4th Fresnel Lenses monomer 4., the 6th Fresnel Lenses monomer 6., the 8th Fresnel Lenses monomer 8., 10. the tenth Fresnel Lenses monomer reach the 12 Fresnel Lenses monomer
Totally 6 Fresnel Lenses monomers are composed and laid out, another row by first Fresnel Lenses monomer 1., the 3rd Fresnel Lenses monomer 3., the 5th Fresnel Lenses monomer 5., the 7th Fresnel Lenses monomer 7., the 9th Fresnel Lenses monomer 9., the tenth a slice Fresnel Lenses monomer
The 13 Fresnel Lenses monomer
Totally 7 Fresnel Lenses monomers are composed and laid out; Adopt the described Fresnel Lenses monomer of the center section of 4 pairs of described Fresnel Lenses assemblies 2 of two described shielding plates to block, two described shielding plates 4 be anchored on described Fresnel Lenses assembly support lens carrier 3; The gap 5 of two described shielding plates 4 is 1-3mm; The described Fresnel Lenses monomer that blocks be the 5th Fresnel Lenses monomer 5., the 6th Fresnel Lenses monomer 6., the 7th Fresnel Lenses monomer 7., 9. 8. the 8th Fresnel Lenses monomer reach the 9th Fresnel Lenses monomer, promptly decay the 5th Fresnel Lenses monomer 5., the 6th Fresnel Lenses monomer 6., the 7th Fresnel Lenses monomer 7., 8. the 8th Fresnel Lenses monomer reach the 9. infrared energy of the search coverage that forms of the 9th Fresnel Lenses monomer, to reach far away, in, in-plant detection is far away, in, closely sensitivity near purpose.
The focal length of described Fresnel Lenses monomer is 15-30mm.
The above only is preferred embodiment of the present invention, is not that technical scope of the present invention is imposed any restrictions.The technician of the industry, under the inspiration of the technical program, can make some distortion and revise, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention above any modification, equivalent variations and modification that embodiment did.
Claims (10)
1. regulate the method for sensitivity of infrared curtain detector, adopt Fresnel Lenses assembly (2) that the infrared signal of the detected object of search coverage is focused on pyroelectric infrared sensor (1), described Fresnel Lenses assembly (2) comprises the Fresnel Lenses monomer that the multi-disc focal length is identical and area equates; It is characterized in that: adopt the method that infrared ray is had a shielding plate (4) of the effect of blocking to be set the useful area that passes through infrared signal by the described Fresnel Lenses monomer of a slice at least of middle part of described Fresnel Lenses assembly (2) is carried out partial occlusion.
2. the method for adjusting sensitivity of infrared curtain detector according to claim 1 is characterized in that: described shielding plate (4) is close to or the close described Fresnel Lenses monomer of a slice at least by the middle part that is arranged at described Fresnel Lenses assembly (2).
3. the method for adjusting sensitivity of infrared curtain detector according to claim 1, it is characterized in that: described shielding plate (4) can be arranged at the side by pyroelectric infrared sensor (1) of the described Fresnel Lenses monomer of a slice at least that leans on the middle part of described Fresnel Lenses assembly (2), or the opposite side of described Fresnel Lenses monomer.
4. an infrared curtain detector comprises pyroelectric infrared sensor (1) and Fresnel Lenses assembly (2), and described Fresnel Lenses assembly (2) comprises the Fresnel Lenses monomer that the multi-disc focal length is identical and area equates; Pyroelectric infrared sensor (1) is arranged on the focus of described Fresnel Lenses assembly (2); It is characterized in that: the shielding plate (4) that infrared ray is had the effect of blocking is set, the useful area partial occlusion that passes through infrared signal by the described Fresnel Lenses monomer of a slice at least of middle part of described Fresnel Lenses assembly (2).
5. a kind of infrared curtain detector according to claim 4 is characterized in that: described shielding plate (4) is close to or the close described Fresnel Lenses monomer of a slice at least by the middle part that is arranged at described Fresnel Lenses assembly (2).
6. a kind of infrared curtain detector according to claim 4, it is characterized in that: described shielding plate (4) can be arranged at the side by pyroelectric infrared sensor (1) of the described Fresnel Lenses monomer of a slice at least that leans on the middle part of described Fresnel Lenses assembly (2), or the opposite side of described Fresnel Lenses monomer.
7. a kind of infrared curtain detector according to claim 4, it is characterized in that: the described Fresnel Lenses monomer of multi-disc is arranged at least one row's cambered surface, every row's described Fresnel Lenses monomer is close to each other composes and lay out, and is close to each other between each row that described Fresnel Lenses monomer is lined up and composes and lay out.
8. a kind of infrared curtain detector according to claim 4, it is characterized in that: described Fresnel Lenses assembly (2) is anchored on Fresnel Lenses assembly support (3), and described shielding plate (4) is fastenedly connected or is overall shaped into one with described Fresnel Lenses assembly support (3).
9. a kind of infrared curtain detector according to claim 4 is characterized in that: described shielding plate (4) is made of heat-resisting ABS plastic.
10. a kind of infrared curtain detector according to claim 4, it is characterized in that: described Fresnel Lenses assembly (2) is made up of the described Fresnel Lenses monomer that 13 parfocals and area equate, 13 described Fresnel Lenses monomers are composed and laid out into two rows, wherein a row is composed and laid out by 6 Fresnel Lenses monomers, and another row is composed and laid out by 7 Fresnel Lenses monomers; Two rows' focus concentrates on the same point; Adopt two described shielding plates (4) that 4-6 the described Fresnel Lenses monomer by center section of described Fresnel Lenses assembly (2) carried out partial occlusion; The gap (5) of two described shielding plates (4) is 1-3mm.
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| CN2009101903902A CN101782661B (en) | 2009-09-22 | 2009-09-22 | Method for adjusting sensitivity of infrared curtain detector and infrared curtain detector |
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| CN2009101903902A CN101782661B (en) | 2009-09-22 | 2009-09-22 | Method for adjusting sensitivity of infrared curtain detector and infrared curtain detector |
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| CN104508437B (en) * | 2012-07-31 | 2016-04-20 | Eizo株式会社 | shading cover structure |
| WO2018161724A1 (en) * | 2017-03-09 | 2018-09-13 | 苏州欧普照明有限公司 | Pyroelectric infrared sensor-based lighting control device and system |
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| CN107170169A (en) * | 2017-05-11 | 2017-09-15 | 中安消物联传感（深圳）有限公司 | The anti-interference method and system of a kind of infrared shooting device |
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