Accession Number : ADA297432

Title :   Characteristics of Optical Fire Detector False Alarm Sources and Qualification Test Procedures to Prove Immunity. Phase 2. Volume 2.

Descriptive Note : Final rept. 8 Apr 91-8 Oct 92,

Corporate Author : DONMAR LTD NEWPORT BEACH CA

Personal Author(s) : Goedeke, D. A. ; Gross, H. G.

PDF Url : ADA297432

Report Date : SEP 1993

Pagination or Media Count : 98

Abstract : This study identified possible sources of UV, IR and visible radiations that may cause an optical fire detector to false alarm and/or affect its fire detection performance. The spectral irradiances of JP-4 pan fires and a multitude of lamps, hot bodies, and other of radiation stimuli that an optical detector may be exposed to in any type of aircraft shelter, hanger, facility, or ground location, were determined. Knowing the spectral irradiances of the required fire size and distance to be detected, it was then possible to determine at what distances would the potential false alarm source have to be to equal or exceed the fire's spectral irradiances in the 185nm - 25Onm and 4.4lm bands. Considering the possible distance from detector to source, candidate false alarm sources were selected for detector immunity testing. Qualification test procedures were developed and tested. It was concluded that there are many possible false alarm sources and, if located too close to a detector, and the stimuli are modulated, most optical fire detectors would alarm.

Descriptors :   *FALSE ALARMS, *OPTICAL DETECTORS, *FIRE DETECTORS, TEST AND EVALUATION, ACCEPTANCE TESTS, GROUND LEVEL, SOURCES, POSITION(LOCATION), RADIATION, DETECTION, DETECTORS, AIRCRAFT, SIZES(DIMENSIONS), SHELTERS, TEST METHODS, SPECTRA, RADIANCE, FIRES, STIMULI, HEAT, IMMUNITY, BODIES.

Subject Categories : Safety Engineering
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE