Video-Enhanced Optical Detector

• US 20110304728A1
• Filed: 06/13/2011
• Published: 12/15/2011
• Est. Priority Date: 06/11/2010
• Status: Abandoned Application

• Current Assignee: The Government Of The United States Of America, As Represented By The Secretary Of The Navy
• Original Assignee: The Government Of The United States Of America, As Represented By The Secretary Of The Navy
• Inventors: Owrutsky, Jeffrey C., Steinhurst, Daniel A., Minor, Christian P.
• Application Number:
  US13/159,262
• Publication Number:
  US 20110304728A1
• Time in Patent Office: Days
• US Class Current: 348/135
• CPC Class Codes: G01J 5/0018 Flames, plasma or welding
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/0846 having multiple detectors for performing different types of detection, e.g. using radiometry and reflectometry channels
• CPC Class Codes: G01J 5/0859 Sighting arrangements, e.g. cameras
• CPC Class Codes: H04N 5/33 Transforming infrared radiation cameras or camera modules for generating image signals from infrared radiation H04N23/20; circuitry of SSIS for transforming infrared radiation into image signals H04N25/20

Abstract

The document describes a method of transforming available live video output from a camera into a format compatible for combination with existing single element detectors operating at various spectral bands to achieve improved performance for non-imaging, optical event detectors, especially for optical flame detectors. The method can utilize data that is becoming increasingly available because of the expanding deployment of surveillance cameras that are prevalent in many sensing and security devices and systems. Augmenting output from established OFD sensors with the data stream converted from the video output and incorporating viable algorithms can yield a detection method with improved performance with respect to both sensitivity and selectivity without requiring additional hardware deployment.

Claims

1. A method for using a video camera output as an optical flame detector to detect flame events, comprising the steps of:

monitoring a space with the video camera that is responsive in the near infrared;

retrieving image data with a near infrared spectral response using a long wavelength transmitting filter mounted on the video camera;

reducing the image data to create a single data stream representing a near infrared spectral bandwidth data stream of the video camera output, wherein the single data stream is a substitute for a near infrared single element spectral sensor; and

analyzing the spectral bandwidth data stream in combination with one or more other single element narrow band spectral optical sensors to detect flame emissions.