.,
.
the atmospheric transmission of thermal radiation near shot time over the
paths from devices to the aircraft.
a
+n ted hae oth ansaat
2 eeURERITE NT RT ER, mene oom SNE te ETT RRR ERT ene Ye RR AOE Cnn re meme me eee ee ee ee
Ft
|
.
Statistical runs planned for the
using an airborne light source were dropped, since no spectrometer data
were obtained. For
wthe light source failed to operate at zero time;
for’
“the light sourée malfunctioned during an interference test on
D-—2 night
Gnd was evacuated on D-1;
and good data were obtained; for {
ford
™ the light functioned well,
e aircraft was forced to abort
due to engine trouble; and for the T
ecause of the latc hour at
which the detonation took place, the transmissumeter was saturated by sunlight. A small number of statistical runs were made on the premise that
the atmospheric transmission over the paths of interest might be relatively
constant. Reduction of the data accumulated on these runs will be accomplished after return to the laboratory, where the instrument will be calibrated. A preliminary cxamination of the amplitudes received under nocloud conditions indicates that atmospheric transmission under these conditions was relatively constant.
2.1.8
Program 9, Technical Photozraphy
The objective of Program 9 was to plan, program, and supervise
technical and documentation photographic services for all DOD projects
participating in the operation. Still photography, in support of projects for
illustrating preliminary and final reports, was condu-ted by TG 7.1, TU-8.
A technical motion picture depicting’ weapon effects tests was assigned to
Lookout Mountain Laboratory for location- shooting and final production.
Technical photography in support of all projects, such as high-speed, time lapge, and function-of-time photography, was conducted under contract with
EG&G.
Project 9.1 was concerned with the photogrammecric determination of
various parameters of nuclear clouds as a function of time and the attempt
to establish approximate scaling (yield) relations. It was a continuation of
a project first attempted on Operation Castle.
Photography commenced at
zero time and was continuous for as long as the nuclear cloud retained its
visible identity, except for turnaround intervals due to the racetrack pattern
flown. At stabilization time, sextant readings to determine approximate
height of cloud top and base were made by the photo navigators.
Cloud-survey photugraphy was planned for all shots with predicted
yields of
Cursory examination of the film in the field in-
dicated that good data
should be obtainable {_
—_
'
‘
en ork ceee mae em ee ee
.
=e
Qwing to natural cloud obscuration, negligible results were obtained |on one
shot and fair results for a Imited time on two participations.
- 37 -
|
t