Accession Number : ADA187504

Title :   Research and Development of Surface Skimming Bulk Wave Devices for Sensor Applications.

Descriptive Note : Final rept. 1 Apr 85-30 Jun 87,

Corporate Author : UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CT

Personal Author(s) : Cullen, Donald E

PDF Url : ADA187504

Report Date : Aug 1987

Pagination or Media Count : 90

Abstract : The application of surface skimming bulk wave (SSBW) technology to sensors, and to an accelerometer in particular, was investigated through further studies of the properties of the SSBW mode, and through the design, fabrication, and evaluation of a laboratory SSBW cantilever beam accelerometer. The long-term stability of the SSBW mode for devices immersed in a damping fluid was shown to be equal to the stability of vacuum sealed devices (approx. 5 ppm/year). The relevant properties of the dual delay line configuration (SSBW devices on both sides of a single substrate) were investigated. The damping of mechanical vibrations in a cantilever quartz beam was studied, establishing the fact that critical damping of the beam can be achieved without difficulty. Evaluation of SSBW accelerometer models showed that the acceleration sensitivity of these devices can be accurately predicted from theory, and that fluid damping can reduce the vibration sensitivity of the SSBW oscillator to less than 5 x 10 to the minus 8th power/G. The results of this study indicate that a practical milli-G range SSBW accelerometer can be developed.

Descriptors :   *ACCELEROMETERS, *CANTILEVER BEAMS, *DAMPING, *DETECTORS, *MECHANICAL PROPERTIES, *OSCILLATORS, *QUARTZ, *VACUUM APPARATUS, *WAVE PROPAGATION, ACCELERATION, DELAY LINES, FLUIDS, LONG RANGE(TIME), MODELS, SEALED SYSTEMS, SENSITIVITY, STABILITY, SUBSTRATES, SURFACES, VIBRATION

Subject Categories : Navigation and Guidance
      Structural Engineering and Building Technology
      Crystallography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE