Accession Number : ADA257902


Title :   Analysis of Images and Spectra of Spacecraft-Induced Radiations


Descriptive Note : Scientific rept. no 2


Corporate Author : PHOTOMETRICS INC WOBURN MA


Personal Author(s) : Rall, D L ; Kofsky, I L ; Gardner II, J A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257902.pdf


Report Date : 17 Jul 1992


Pagination or Media Count : 85


Abstract : The visible and short wavelength infrared emissions excited from the -110-km altitude atmosphere by the exhaust of solid composite rocket motors of the Bow Shock 2 Experiment (18 Feb 1991) are analyzed and interpreted, and assistance with laboratory measurements of the excitative reactions with ionospheric species of gases from space vehicle operations is reported. A -10 s- persisting visible wake trail with relatively stable geometry photographed from the 350 km distant Air Force Maui Optical Site is found to be produced by chemiluminescent reactions of a minor Al atom-containing combustion Product molecule with ambient oxygen atoms. The much shorter-lived and smaller-volume but several orders of magnitude brighter expanding SWIR glow that Phillips Laboratory/WSSI imaged with a PtSi-photocathode camera at AMOS is identified as the high temperature contact surface with swept-out air of the posigrade- directed thruster exhaust gas. The development of both emitting regions is found to be reasonably well predicted by similarity hydrodynamics for static explosions in the high atmosphere. Absolute optical radiance distributions and yields, and prescriptions for scaling to other exhaust energy deposition rates and altitudes, are presented.


Descriptors :   *INFRARED DETECTORS , *BOW SHOCK , *RADIOMETERS , *RADIOMETRY , *WAKE DETECTORS , *COMBUSTION PRODUCTS , *ROCKET EXHAUST , *SOLID PROPELLANTS , EMISSION , MEASUREMENT , TEMPERATURE , VOLUME , AIR FORCE , SPACECRAFT , DISTRIBUTION , AIR , CHEMICALS , MOLECULES , HIGH TEMPERATURE , SITES , ENERGY , EXPLOSIONS , RATES , ATOMS , SOLIDS , SHORT WAVELENGTHS , THRUSTERS , ROCKET ENGINES , HYDRODYNAMICS , MOTORS , STATICS , ALTITUDE , CONTAMINATION , KINETICS , PHOTOCATHODES , PHOTOMETRY , ROCKETS , ATMOSPHERES , VEHICLES , LABORATORIES , REGIONS , SURFACES , OXYGEN , PROPELLANTS , COMBUSTION , DEPOSITION , RADIANCE , SHOCK , CAMERAS , OPERATION , WAKE , ENGINES , GEOMETRY


Subject Categories : Antimissile Defense Systems
      Optical Detection and Detectors
      Combustion and Ignition
      Solid Rocket Propellants


Distribution Statement : APPROVED FOR PUBLIC RELEASE