Accession Number : ADD012555

Title :   Atmospheric Contrast Transmittance Monitor.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Johnson,Richard W

Report Date : 30 Sep 1986

Pagination or Media Count : 7

Abstract : An atmospheric contrast transmittance monitor is described which comprises an electro-optical system including three solid state transducer assemblies interfaced with a small dedicated microcompressor for control of the system in either semi-automatic or operator interactive modes for real time monitoring of the optical state of the atmosphere, one assembly comprising a compact multi-channel nephelometer of novel configuration for providing directional volume scattering function measurements on atmospheric samples, and a pair of staring fisheye lens scanners and associated detectors for scanning the upper and lower hemisphere radiance distributions. The system requires only a few hundred watts of input power and is less than one meter in length overall, and, operating in pulsed mode, has been used to measure the scattering characteristics of clear-day room air, with adequate sensitivity to suggest the capability of measurements approaching .00001/m i.e., sea level molecular.

Descriptors :   *PATENTS, *RADIATION MONITORS, *ELECTROOPTICS, *NEPHELOMETERS, MICROPROCESSORS, REAL TIME, ON LINE SYSTEMS, CONTRAST, TRANSMITTANCE, SOLID STATE ELECTRONICS, ELECTRONIC SCANNERS

Subject Categories : Atmospheric Physics
      Electricity and Magnetism
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE