Method and apparatus for installing infrared sensors in intrusion detection systems
First Claim
1. A method for installing an infrared radiation sensor having a predetermined zone of coverage and directional reception and defining at least one directional area of sensitivity, in order to prevent reception of infrared radiation from identifiable sources which would cause interference with the operation of said infrared radiation sensor, comprising:
- (a) making a photographic image, photographed from a sensor location where said infrared radiation sensor is intended to be mounted, and showing at least a portion of said zone of coverage which said infrared radiation sensor would have when mounted in a sensor location;
(b) visually identifying in said photographic image a source of potentially interfering infrared radiation located in said zone of coverage; and
(c) blocking reception by a sensor in said sensor location of infrared radiation from said source of potentially interfering infrared radiation visually identified from said photographic image.
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0 Petitions
Accused Products
Abstract
Apparatus and a method for previewing the field of coverage of an infrared sensor and, accordingly, adjusting its position for use in an intrusion detection alarm system. A mirror can be mounted in place of the infrared sensor and has indicia corresponding to beams of sensitivity of the infrared sensor to provide an indication of the beams of sensitivity superimposed on an image reflected by the mirror to aid in adjusting the position of the infrared sensor. Alternatively, or as verification of the sensor position, a photograph can be prepared by use of a camera located in a proposed infrared sensor position. Directional beams of sensitivity of the infrared sensor are plotted on the photograph by the use of a prepared transparent overlay showing the correspondence between areas of the photograph and respective elements of the lens of the infrared sensor. Portions of the sensor lens are masked to block reception of infrared radiation from known sources along beams of sensitivity of the infrared sensor.
40 Citations
46 Claims
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1. A method for installing an infrared radiation sensor having a predetermined zone of coverage and directional reception and defining at least one directional area of sensitivity, in order to prevent reception of infrared radiation from identifiable sources which would cause interference with the operation of said infrared radiation sensor, comprising:
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(a) making a photographic image, photographed from a sensor location where said infrared radiation sensor is intended to be mounted, and showing at least a portion of said zone of coverage which said infrared radiation sensor would have when mounted in a sensor location; (b) visually identifying in said photographic image a source of potentially interfering infrared radiation located in said zone of coverage; and (c) blocking reception by a sensor in said sensor location of infrared radiation from said source of potentially interfering infrared radiation visually identified from said photographic image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of evaluating a proposed location for installation of an infrared sensor, comprising:
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(a) making a photographic image by receipt of light at a sensor location proposed for placement of an infrared sensor having a plurality of directionally oriented beams of sensitivity; (b) plotting on said photographic image the location of at least one of said plurality of directionally oriented beams of sensitivity; and (c) visually determining from said photographic image whether a plotted location of any of said directionally oriented beams of sensitivity includes a source of undesirable infrared radiation. - View Dependent Claims (11, 12)
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13. A method for preparing an infrared sensor defining a plurality of beams of sensitivity for installation in a predetermined sensor position, comprising:
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(a) preparing a photographic image of an area visible from said predetermined sensor position; (b) plotting a respective area representing at least one of said beams of sensitivity on said photographic image; (c) for each beam of sensitivity plotted on said photographic image determining whether a source of potentially interfering infrared radiation is shown in said photographic image; and (d) making said infrared sensor insensitive to receipt of infrared radiation along each beam of sensitivity for which it has been determined that a source of potentially interfering infrared radiation is shown in said photographic image. - View Dependent Claims (14, 15)
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16. Apparatus for previewing a zone of coverage of a directionally sensitive infrared sensing device from a proposed sensor location, comprising:
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(a) photographic means for receiving light at a proposed sensor location where said sensing device is proposed to be placed and producing a photograph of an area to be monitored by said sensing device; (b) plotting means for indicating on said photograph a directional beam of sensitivity of said sensing device, and for thereby facilitating a determination of whether a source of potentially interfering infrared radiation visible in said photograph is located within said beam of sensitivity of said sensing device located in said proposed sensor location. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. Apparatus for use in installing an infrared sensor responsive to infrared radiation received along at least one directional beam of sensitivity, comprising:
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(a) light gathering means for receiving light at a proposed sensor location where said sensor is proposed to be placed and producing a photograph of an area to be monitored by said sensor; (b) plotting means for indicating on said photograph said at least one directional beam of sensitivity of said sensor, and for indicating whether a source of infrared radiation visible in said photograph is located within said at least one directional beam of sensitivity of said sensor located in said proposed sensor location; and (c) means for blocking transmission of infrared radiation to said sensor along said at least one beam of sensitivity identified through use of said plotting means as including said source of infrared radiation visible in said photograph. - View Dependent Claims (24)
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25. Apparatus for use in preparing for installation of an infrared sensing device having a field of view for use as part of a security maintenance system, comprising:
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(a) means for producing a photograph representative of the field of view of said infrared sensing device; and (b) plotting means for identifying particular portions of said photograph and correlating said portions of said photograph with respective portions of said field of view covered by said sensing device. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. Apparatus for previewing a zone of coverage of a directionally sensitive infrared sensing device from a proposed sensor location, comprising:
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(a) mirror means located proximate a proposed sensor location, for receiving visible light and for providing an observer a reflected view of an area to be monitored by said infrared sensing device; (b) alignment means associated with said mirror means for indicating when an eye of said observer is in a predetermined viewing position with respect to said mirror means; and (c) indicia means associated with said mirror means and visible to said observer when said eye is in said viewing position, for indicating the location of a directional beam of sensitivity of said sensing device and for facilitating a determination of whether a potential source of interfering infrared radiation visible to said observer as a reflected image in said mirror means is located within said beam of sensitivity of said sensing device located in said proposed sensor location. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method for evaluating a proposed location for an infrared sensing device and for adjusting the orientation of said infrared sensing device, comprising:
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(a) mounting a support bracket in a proposed location for an infrared sensing device; (b) mounting a mirror, including indicia representative of the limits of each of a plurality of directional beams of sensitivity of said infrared sensing device, on a movable portion of said support bracket in a predetermined relationship to said movable portion of said support bracket; (c) from a predetermined position with respect to said mirror, observing an image reflected in said mirror and observing with respect to said image the location of each of said directional beams of sensitivity as represented by said indicia; (d) adjusting said movable portion of said support bracket as necessary to place said mirror in a position in which observing said reflected image in said mirror with reference to said indicia indicates that each of said directional beams of sensitivity is located in an acceptable orientation; (e) securing said movable portion of said support bracket in said position; and (f) mounting said infrared sensing device on said movable portion of said support bracket.
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Specification