Fiberoptic Sonar Dome Pressure Transducer

Period of Performance: 02/15/1990 - 02/15/1994

$854K

Phase 2 SBIR

Recipient Firm

Luxtron Corp.
9550 SW Nimbus Ave
Beaverton, OR 97005
Principal Investigator

Research Topics

Abstract

THE HIGHEST PERFORMANCE PRESSURE SENSORS PRESENTLY IN USE UTILIZE A VIBRATING QUARTZ CRYSTAL TUNING FORK AS THE SENSOR. THE TUNING FORK IS DRIVEN ELECTRICALLY AT ITS RESONANT FREQUENCY WHICH SHIFTS IN PROPORTION TO PRESSURE APPLIED TO IT. PRESSURE SENSORS OF THIS TYPE EXHIBIT EXTREME STABILITY, WIDE DYNAMIC RANGE, EXCELLENT LINEARITY AND VERY HIGH PRECISION. SUCH SENSORS ARE PRESENTLY MANUFACTURED FOR RUGGED USES SUCH AS IN DEEP SEA, AEROSPACE AND DOWNHOLE MEASUREMENTS. THE PROPOSED FIBEROPTIC SENSOR IS AN OPTICAL ADAPTATION OF THIS PRESSURE SENSOR. ITS OSCILLATOR CIRCUITRY IS POWERED BY LIGHT FROM AN LED. A SECOND LIGHT BEAM, SHUTTERED BY THE VIBRATING TINES OF THE TUNING FORK, DETECTS THE SHIFT IN FREQUENCY OF OSCILLATION. SINCE THE MEASUREMENT IS INHERENTLY "DIGITAL", IT IS INSENSITIVE TO INTENSITY CHANGES. THE PROGRAM WILL FOCUS ON OPTICAL AND MECHANICAL DESIGN OF THE SENSOR AND DESIGN OF THE OPTIMUM OPTOELECTRONICS PACKAGE TO POWER AND MEASURE THE FREQUENCY SHIFT OF THE SENSOR. ATTENTION WILL ALSO BE GIVEN TO PRACTICALITY AND RUGGEDNESS ISSUES, INCLUDING THE ABILITY TO MEET APPROPRIATE NAVY SHIPBOARD STANDARDS REGARDING SHOCK, VIBRATION AND EMI. THE SYSTEM WILL PROVIDE OUTPUTS COMPATIBLE WITH THE INSTALLED FIBER OPTIC INTER-COMPARTMENT CABLE SERVICE (ICCS) OF THE FIBEROPTICALLYINSTRUMENTED AEGIS (GC47) CLASS CRUISERS.