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SY
(eRIF)
Project 8.5 - Airborne High Resolution Spectral Analysis - R, 2irkind
OBJECTIVE
To determine the spectral characteristics of the radiant pover
of an sirburst fireball prior to its being shooked by the reflected
wave,
INSTRUMENTATION
The spectral distribution of the radiant power is obtainei
foom 2 sedicm Guarts Nilge: spectrometer,
Be spectrum is sespled
in narrow bands by photocells in the visible region and PbS cells
in the infra-red,
The electrical signal is then recorded on an
Ampex 814 tape recorder, with a resolution tine of 150 ~« sec.
The
transmission measurement is accomplishei by beaming a pulsed light
signal of known output ani spectral distribution from ea fixed point
on the grouni towards the aircraft.
The attenuated beam is received
by a datector in the afireraft and recormie! on a Helland recorier.
The detector consista of two filtere! photomultiplier tubes sampling
two spectral regions, (1) .3-.55 microns and (2) .6-1,05 mtcrons.
In addition, a quarts filtered calorimeter, 22 degrees fieli of viev,
de utilisel to measure the approximate raiiant exposure receivei at
the spectrometer.
iromzs
BEST AVA
ILABLE COPY
The aircraft was loanted at the desired posi<ion, namely 22,000
feet absolute, directly over ground sero at T,, during the entire
length of the thermal pulse.
The spectrometer operated normally and to date good data has been
ta “fy
~ oan
¥
rey
obtained on 1° channels
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