Fog Bank Detector Field Tests : A Technical Summary

Details

• Creators:
  Lifsitz, Jack R. ; Yaffee, Melvin Y.
• Corporate Creators:
  John A. Volpe National Transportation Systems Center, (U.S.)
• Subject/TRT Terms:
  Backscattering Fog Infrared Detectors Lasers Optical Detectors Optical Radar Performance Radiometers Reliability
• Publication/ Report Number:
  DOT-TSC-USCG-72-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  California
• Corporate Publisher:
  United States. Coast Guard
• NTL Classification:
  NTL-MARINE/WATERWAYS TRANSPORTATION-U.S. Coast Guard ; NTL-MARINE/WATERWAYS TRANSPORTATION-Ships and Vessels ; NTL-MARINE/WATERWAYS TRANSPORTATION-Marine Safety
• Abstract:
  The report summarizes the results of field experiments performed at Pt. Bonita, California. The system under study, a laser LIDAR and a vertical-scanning infrared radiometer, have been discussed in detail in Report No. DOT-TSC-CG-71-3. Measurements of the peak power and shape of the return LIDAR pulse, and of the background levels, support the assumptions made in that report. The largest value of background spectral radiance measured, when a sunlit cloud fills the LIDAR receiver field-of-view, is 2 micro w/sq cm/A/sr (at 6943A). The infrared radiometer was found to be susceptible to ambiguities serious enough to eliminate this method from use as a reliable fog detector at the present time. Based on the laser backscatter results, a LIDAR fog bank detector, using a GaAlAs laser diode array as the transmitting source, is recommended and conclusions regarding its technical performance are presented.
• Format:
  PDF
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha256:d77b00ed7ae8ae82c2b20e974b0b3ef7090ea604216212d3739edd7e64682efb
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/11582/dot_11582_DS1.pdf
• File Type:
  [PDF - 1.22 MB ]