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INTRODUCTION
1.1 PRIMARY OBJECTIVE
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Project 1.2b had as its primary objective the measurement of airpressure-time versus distance in the high-pressure region. This region
was defined for these tests as being between the pressure levels of 40
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initiated, mechanical gages, which had been used during Cperation
ip
;
Improved versions of the self-contained, flash-
Psi through 200 psi.
j i UPSHOT-KNOTHOLE were utilized (see Reference 1),
The measurements
: “* were to extend the scaling laws, to increase fundamental air blast data,
| pi and to improve the prediction of blast parameters produced by the
“detonation of high-yield nuclear weapons,
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Secondary Objectives
tod Secondary objectives of this project were to:
(2) obtain
pressure-fi @ measurements for Froject 3.3 within a tree stand and to
relate thes to undisturbed medium measurements at similar ground
ranges; /@) provide the gages and aid in the analysis of both pressure-
time analdyraban:2ppc ares data for Project 1.8;
(3) provide full-scale
tests of newly 2 ap ozp.i self-recording gages designed for the measurement of aynncnia‘yecssures, ground accelerations, and pressure-time;
and (4) establish the validity and accuracy of the records obtained by
self-containnd ‘gauss by comparisons with electronically recorded
measurements.
i.2
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BACKGROUND
The proper evaluation
the military effects of nuclear weapons
requires adequate knowledga
of the various phenomena which occur
during and after the detonation of such weapons. A basic phenomena is
the pressure~time-distance
¥arintion of air shock waves resulting from
the detonations of these weapons. ,operation IVY was the first opportunity to study the blast phenomenéLogy of a high-yield device and
further the IVY Mike shot was onlyfthe second surface burst of a
nuclear device.
Thus, valuable igformation was obtained not only in
scaling, but also for determining the z
burst curves.
points of the height-of-
‘The experimental data onjair blast were obtained from
Sandia Corporation measurements (see Reference 2), Because of
instrumentation difficulties, no data w
obtained at pressure levels
greater than 20 psi; however, data that were eet tended to verify
the scaling procedure.
It was recognized, howe¥$r, that additional
data in the higher pressure regions of a surfade
burst would be of
ereat value.
Therefore, the various shots of“Oper: etn CASTLE were
instrumented to provide air pressure data in high :,1, 49" pressure
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regions from surface bursts of high-yield devices.
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