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This project investigates the possibility of intersubband optoelectronics as a general replacement for standard interband lasers and detectors when radiation hardness is a prime concern.It is argued that the majority carrier nature of the intersubband device provides intrinsic resistance to displacement-related effects that occur during high energy particle irradiation.This argument will be proven ...

THE CONCEPT COMBINES INHERENT LACK OF SIGNIFICANT SENSITIVITY TO UNWANTED STRESS COMPONENTS WITH PRACTICALITY OF COUPLING TO ROCK WITH LITTLE OR NO GROUT. BUILDING ON A FOUNDATION OF GHOROUGH THEORETICAL ANALYSIS AND DEMONSTRATION OF MANUFACTURING FEASIBILITY BASED ON PREVIOUS WORK, THE OBJECTIVE IS TO VERIFY KEY ASPECTS IN THE LABORATORY. THIS WILL INCLUDE VERIFICATION OF LACK OF CROSS-AXIS SENSI ...

IT IS PROPOSED TO DEVELOP A STRESS GAGE FOR THE RANGE 1/2 TO 10 KILOBARS, SUITABLE FOR USE IN SOIL AND WEAK ROCK, IN FREE-FIELD AND ON-STRUCTURE APPLICATIONS. IN ADDITION TO THE USUAL COMPRESSIVE STRESS SENSING CAPABILITY, THERE WOULD ALSO BE A SHEAR STRESS SENSING OPTION; THE TWO MEASUREMENT CHANNELS COULD ALSO BE COMBINED IN A SINGLE GAGE BODY PACKAGE. FIELD DATA RECORDING COST AND SYSTEM PROBLE ...

UNIQUE CHARGE-COUPLED DEVICES MAY BE ABLE TO RECORD PHENOMENA WITH INFORMATION SPANNING DC - 20GHZ. DATA TO BE RECORDED IS SAMPLED AT RATES UP TO 100 GS/S AND STORED TEMPORARILY IN THE CCD. IT IS THEN SHIFTED AT SLOW RATES INTO A CONVENTIONAL A/D AND DIGITAL MEMORY. PRELIMINARY RESEARCH SUGGESTS BROAD TRADE-OFFS AMONG RECORD LENGTH, SAMPLING INTERVAL, DYNAMIC RANGE, AND OTHER FACTORS. OUR FIRST ST ...