Accession Number : AD0489248

Title :   DEVELOPMENT OF AN UNLINKED LONG SPAN STRAIN GAGE.

Descriptive Note : Final rept. 21 Jun-21 Dec 65,

Corporate Author : IIT RESEARCH INST CHICAGO IL

Personal Author(s) : Tobin, Henry G.

Report Date : SEP 1966

Pagination or Media Count : 48

Abstract : 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,

Descriptors :   (*STRAIN GAGES, SOILS), (*SOILS, SHOCK WAVES), MEASUREMENT, MAGNET COILS, ELECTROMAGNETIC FIELDS, INDUCTANCE, WAVEGUIDES, PHASE SHIFT CIRCUITS, ACOUSTIC EQUIPMENT, ULTRASONIC RADIATION.

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE