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DEVELOPMENT OF AN UNLINKED LONG SPAN STRAIN GAGE.
Final rept. 21 Jun-21 Dec 65,
IIT RESEARCH INST CHICAGO IL
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The unlinked concept involves the transfer of energy between the extremes of a vertical hole in the soil. Techniques studied were electromagnetic, acoustic, and optical. Both a wave guide technique and transmission through the soil were investigated on a theoretical basis. Of the low and high frequency ultrasonic methods studied, the most promising appeared to be the low frequency transmission. Results from experimental investigations of this system indicate that it can be made to perform adequately on a static basis but the dynamic performance will be limited by environmental noise. A possible technique for reducing this noise level is presented,
APPROVED FOR PUBLIC RELEASE