1. ERDC Knowledge Core
  2. Engineer Research and Development Center (ERDC)
  3. Cold Regions Research Engineering Laboratory (CRREL) - (2/1/1961 - present)
  4. Publication
  5. CRREL Report
Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/9172
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dc.contributorUnited States. Air Force. Electronic Security and Communications Center for Excellence-
dc.contributor.authorPeck, Lindamae-
dc.date.accessioned2016-06-20T13:40:34Z-
dc.date.available2016-06-20T13:40:34Z-
dc.date.issued1993-11-
dc.identifier.urihttp://hdl.handle.net/11681/9172-
dc.descriptionCRREL Report-
dc.descriptionAbstract: The diurnal and seasonal variations in the magnitude of and rate of change of surface temperature have been investigated for vegetated and snow-covered ground under winter, summer and transitional weather conditions at a site in Vermont. The variability in thermal radiance is evident as changes in the proximity-to-alarm status of passive infrared detection systems. A mid-winter snow cover is the most favorable background because its associated thermal radiance changes are less dynamic than are the radiance changes of uniform grass covers in summer or mixed backgrounds of grass—thatch—soil following winter. Grass—thatch—soil backgrounds typically experience a larger diurnal range in temperature (from nighttime low to daytime high) and greater spatial variability in thermal radiance than do the uniform grass covers. The summer grass is more likely to be long enough to blow in the wind, thereby causing a change in thermal radiance as variously the sun-warmed, upper portion of the grass blades or the shaded (and therefore cooler) basal portion of the grass blades, and perhaps the sheltered soil, are momentarily exposed to the passive infrared system.-
dc.publisherCold Regions Research and Engineering Laboratory (U.S.)-
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relationhttp://acwc.sdp.sirsi.net/client/en_US/search/asset/1001303-
dc.relation.ispartofseriesCRREL report ; 93-22.-
dc.rightsApproved for public release; distribution is unlimited.-
dc.sourceThis Digital Resource was created from scans of the Print Resource-
dc.subjectDetection capability-
dc.subjectEnvironmental effects-
dc.subjectIntrusion detection-
dc.subjectPassive infrared sensors-
dc.subjectPerimeter security-
dc.subjectSensors-
dc.subjectInfrared detectors-
dc.subjectThermal properties-
dc.titleThermal variation in vegetated or snow-covered background scenes and its effect on passive infrared systems-
dc.typeReporten_US
Appears in Collections:CRREL Report

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