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(FLATHEAD)
Project 8.5 = Airborne High Resolution Spectral Analysis = R, Zirkind
Ob jective
To determine the radiant power of a
function of wavelength and the fireball olor temperature as seen from
an airborne station.
These objectives were to be accomplished by deter=
mining the atmospheric attenuation by an independent measurement and
correcting the power received at the instrument station aboard the air=
craft.
Instrumentation
“
The spectral distribution of the radiant power is obtained from a
medium quartz Hilger spectrometer.
The spectrum is sampled 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 81, tape recorder, with
a resolution time of 150~sec.
The transmission measurement is accomplished
by beaming a pulsed light signal of known output and spectral distribution
from a fixed point on the ground towards the aircraft.
The attenuated
beam is received by a detector in the aircraft and recorded on a Heiland
recorder,
The detector consists of two filtered photo-multiplier tubes
sampling two spectral regions, (1) .3-.55 microns and (2) .6-1.05 microns.
In addition, a quartz filtered calorimeter, 22 degrees field of view, is
utilized to measure the approximate radiant exposure received at the spec=
trometer.
Results
The aircraft was approximately 1950 feet beyond intended location at
COPIED/DQE
LANL RC
Planned position was on an out-bound heading of 287°9T having a
mo
time zero.
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