A feasibility study of a miniature solid-state pressure transducer, Volume 1366
National Aeronautics and Space Administration, 1969 - Technology & Engineering - 58 pages
This report summarizes the piezojunction effect, i.e., the sensitivity of the electrical characteristics of a p-n junction to mechanical strain, and discusses its potential as a stress transducing mechanism. The objective of this study was to demonstrate the feasibility of using the piezojunction effect as the sensory phenomenon in a solid-state pressure transducer.
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APPENDIX A THE RELATIONSHIP OF STRESS TO STRAIN
FUNDAMENTAL FREQUENCY OF A CIRCULAR DIAPHRAGM
achieved amplifier applied stress approximately bell jar breakdown voltage bridge circuit Bridge Read-out Circuit Buff Point Characteristics of PT//14 completed transducer Compressional Stress conduction band minima contact window curve tracer deformation potential coefficients differential pressure diffusion diodes drift dynes/cm effects of stress energy levels epoxy Etch evaluated Fermi energy Figure forward characteristics Forward V-I fundamental frequency hole band housing illustrated in Fig investigation junction area Langley Research Center low pressure mechanical shaping minority carrier density needle sensor configuration output voltage oxide Photograph piezojunction effect piezojunction phenomenon pressure differentials procedure is identical radius Ratio of Stressed Read-out Voltage Research Triangle Institute reverse characteristics shank silicon diaphragm silicon needle sensor Simple Diaphragm SOLID-STATE PRESSURE TRANSDUCER stress applied Stressed to Unstressed tended tensional stress Transducer Configuration Transducer Test Apparatus transducers fabricated uniaxial unijunction Unstressed Minority Carrier V-I characteristics V-I-Stress Characteristics V/div valence band Yv(e