Abstract:
A sensor-camera ganged intrusion detecting apparatus according to the present invention includes a sensor unit 1 for detecting an object Q in terms of a change in amount of reception of detection rays from a detection area A0 to An, an image processing unit 4 for detecting the object Q in terms of a change of a video signal MS from a specific area AC1 in an area shot by a camera 2, which specific area AC1 has a portion overlapped with the detection area A0 to An, an area setting unit 3 for setting the specific area AC1 on a monitor screen 6 coupled with the camera 2, and a detection signal generating unit 5 for generating an object detection signal DE1 based on a detection signal PD from the sensor unit 1 and a detection signal MD1 from the image processing unit 4.
Abstract:
A motion-sensing light includes a power cord with a plug to be plugged into an electrical outlet. In one embodiment, the light is moisture-resistant, allowing the light to be used outdoors with a suitable electrical outlet. The light may be mounted on a wall with nails or screws, hung from a hook, or a mounting bracket that holds the lamp in a desired orientation, yet allows removal and re-insertion of the light.
Abstract:
Sensors using detector arrays (1) are intended for identifying events within a scene (12). A sensor comprising an array of pyroelectric infrared detectors (1) is mounted directly onto an integrated readout circuit (2) so that each of its elements is in electrical contact with one of the inputs to the readout circuit. The detector array (1) on its readout circuit (2) is positioned at the focus of an infrared transmitting lens (11) so that an image of a scene (12) is formed on the array. The readout circuit (2) and array (1) are enclosed in a package (18) which is connected via a circuit board (19) to a microprocessor (20). The microprocessor (20) and readout circuit (2) work together to detect the occurrence and position of events within a scene (12). Application examples are the detection and identification of location of flames or intruders within the field of view.
Abstract:
A thermal object detecting method and apparatus. According to the method and apparatus, a thermal image of a measuring space is obtained by a two-dimensional thermal image detecting device. Then, position information of an object in the measuring space is obtained by an object distance detecting device, which determines a distance between the apparatus and the object. The output of the two-dimensional thermal image detecting device can be corrected using the distance data from the object distance detecting device.
Abstract:
A passive infrared intrusion detection device uses a dual element pyroelectric detector and a housing for surrounding and containing the dual element pyroelectric detector. The housing has a plurality of Fresnel lens elements for gathering infrared radiation from a "look down" volume of space and for focusing the gathered infrared radiation onto the pyroelectric detector. A mask positioned between the plurality of Fresnel lens elements and the detector partially occludes the gathered infrared radiation from the Fresnel lens elements to one of the elements of the dual element pyroelectric detector creating an imbalance in the signal thereby preventing common mode rejection.
Abstract:
The intrusion detection system of the invention, in which three pyroelectric detectors are disposed in line with a interval and an adjoining two of the three pyroelectric detectors are electrically connected to cancel electrical charges generated by each pyroelectric detector, detects intrusion of an infrared ray radiating object such as a human body for example by output signals outputted from the adjoining two and the other of the three pyroelectric detectors or by output signals outputted from the pyroelectric detector disposed at the center and adjoining one and output signals outputted from the one disposed at the center and adjoining another one of these pyroelectric detectors, so that precise and secure intrusion detection is possible by reducing erroneous signals generated by those pyroelectric detectors due to variation of the atmospheric temperature and the like.
Abstract:
A passive infrared detection system embodies a new three-element, single-channel, pyroelectric detector. For a given amount of motion by a target in a region under surveillance, the detector provides more complex signature information than conventional two-element detectors, thereby allowing the target to be more readily distinguished from spurious environmental or background sources. Owing to the geometry of the detector electrodes, the false-alarming effects produced by spurious stimuli common to all detector elements are reduced. The detector is particularly adapted for use in infrared detection systems of the type which use pulse-counting techniques to distinguish targets of interest from non-targets.
Abstract:
An arrangement for detecting the passage of living beings into and out of a surveillance region includes optics which concentrate thermal radiation energy from the surveillance region into a detection zone where an active area of a pyroelectric detector is situated and converts the thermal radiation energy received thereby into an electrical signal. An evaluating device evaluates the electrical signal of the detector to provide an indication of either the entry of a living being from the outside into, or the exit of a person from, the surveillance region from a change in the total thermal radiation energy received by the active area from the surveillance region. The optics may incorporate a mask which prevents thermal radiation from the outside of the surveillance region from reaching the active area of the detector. The mask includes a marginal portion which peripherally bounds an opening for the passage of the thermal radiation energy from the surveillance region to the detection zone and which may include at least one serration at the opening for controlling the timing of the electrical signal caused by entry of a living being into an area of the surveillance region corresponding to the serration relative to those caused by entry of a living being into the remainder of the surveillance region.
Abstract:
External noise in an infrared sensor for a ceiling type human detector is suppressed by increasing the conductivity between a conductive window and the can and improving the temperature compensation by offsetting any difference in the electromotive force per unit area of the inside and/or outside electrode of the sensitive element consisting of coaxial electrodes with different areas. In a pair of electrodes for ceiling mounting the electromotive force is larger than in a pair of lower electrodes for floor mounting. The sensor improves a total sensitivity for use in the infrared sensor for a wall installation type human detector, on account of improving performance and reliability of the pyroelectric infrared sensor for use as a human detector.
Abstract:
A dual pyroelectric crystal sensor suitable for infrared intruder alarms and the like having two separate closely spaced identical pyroelectric crystal detectors connected in parallel opposition. The sensor includes a single ended field effect transistor amplifier with the entire sensor encapsulated in a TO-5 can. The two crystals each have one end cemented to a ceramic substrate in a cantilevered fashion, permitting shock or vibration to affect each crystal equally. Therefore, voltages due to the piezoelectric responses of the crystals are equal and cancel. If both crystals are irradiated by a common heat source, the pyroelectric generated voltages will cancel. If either crystal is irradiated separately, an output voltage will be produced.