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Photo Electric or Optical Sensors They are triggered by smoke disturbing an existing beam of light inside the detector. When smoke is not present, the beam from a light source inside the device travels in a straight line to a detector, but when smoke particles enter, some of the light is scattered and triggers the electrical circuit that sounds the alarm. Air Sampling Detectors These have sensors that are capable of detecting microscopic smoke particles in the air. They actually draw air into the detector and passes it into minute pipes that lead to a laser optical device that has the capability to detect minute particles of combustion. When the laser detects the unusual content, it triggers the alarm. Combination Type Detectors It use both ionization and optical sensors, as mandated by some states. Ionization detectors tend to react slower, and may not warn people inside the house or commercial buildings adequately enough to be able to make it to the exit. So fire departments and legislative bodies recommended installing photo electric smoke detectors, or combination type detectors. The other feature that one may consider in a smoke detector is its gas detection capability. Incorporated in many of the newer models are carbon monoxide and carbon dioxide sensors that trigger an alarm when there is a high level of these gases present in the air. As stand alone detectors, they may be useful as alarms against dangerous gases, but may not be able to detect smoke out of ordinary fires early enough.

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01.14.2007 | 34 Comments

Best OverallNest Cam IndoorNest Cam Indoor has excellent video quality, especially in low light. It's easy to set up and has excellent smart home compatibility. View SiteBest ValueBelkin NetCam HD+The Belkin NetCam HD+ is the best value in our comparison because of its unmatched nighttime video quality, despite average daytime video quality and poor audio performance in our tests. View SiteBest Video QualityFlir FXFlir FX produced the top video quality and clarity in our tests, especially in bright daylight environments, though its setup process takes at least 30 minutes. View SiteProductPriceOverall RatingVideo and AudioConvenience and OperationHelp and SupportStorage TypeMonthly PricingWarrantyCustomer SupportScheduled RecordingEase of UseLocation DetectionVideo Quality – NightStill ImagesVideo Quality – DayStandout FeatureSupports 5 GHz Wi FiHome Automation PlatformConnection QualityTwo Way AudioSound DetectionAudio QualityField of ViewResolutionDigital ZoomNight Vision RangeNest CamView Deal4. 5/59. 47. 98. 5/598. 48. 6Cloud$9.

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01.14.2007 | 16 Comments

Similarly, the division of functionality between a video source 222 and the server system 164 can vary in different implementations. For example, in some implementations, the client side module is a thin client that provides only user facing input and output processing functions, and delegates all other data processing functionality to a backend server e. g. , the server system 164. Similarly, in some implementations, a respective one of the video sources 222 is a simple video capturing device that continuously captures and streams video data to the server system 164 with limited or no local preliminary processing on the video data. Although many aspects of the present technology are described from the perspective of the server system 164, the corresponding actions performed by a client device 220 and/or the video sources 222 would be apparent to one of skill in the art. Similarly, some aspects of the present technology may be described from the perspective of a client device or a video source, and the corresponding actions performed by the video server would be apparent to one of skill in the art. Furthermore, some aspects of the present technology may be performed by the server system 164, a client device 220, and a video source 222 cooperatively. In some implementations, a video source 222 e. g. , a camera 118 or 106 transmits one or more streams of video data to the server system 164.