Accession Number : ADD018350

Title :   High Pressure, high Frequency Reciprocal Transducer.

Descriptive Note : Patent, Filed 24 Jan 95, patented 5 Nov 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Tims, James A

Report Date : 05 Nov 1996

Pagination or Media Count : 6

Abstract : A high frequency transducer capable of transmitting and receiving having an operational range from 100 kHz to 2 MHz, a free field voltage sensitivity (FFVS) greater than -218 dB re 1 V/(mu)Pa (300 kHz), and a maximum hydrostatic pressure rating of 20.68 Mpa (3000 psi). The sensor element is made of lead titanate with a radial mode of 150 kHz being suppressed by the use of a rubber grommet surrounding the lead titanate element. The sensor element is retained within a sensor housing by a plurality of annealed iron wires attached to an annealed iron ring, both of the faces of the sensor housing are then covered with an acoustically transparent window of natural gum rubber. The sensor housing is attached to a non-metallic preamplifier housing made of a rigid polyurethane containing a preamplifier circuit, a transmit protection circuit, and a plurality of relays for switching the preamplifier circuit during the transmit and receive modes. A remotely control unit is connected to the transducer through a cable attached to a connector located on the preamplifier housing. The sensor housing and preamplifier housing are joined together electrically by a slip fit coaxial coupler for ease of maintenance and repair.

Descriptors :   *PRESSURE TRANSDUCERS, *HYDROPHONES, *PATENTS, SIGNAL PROCESSING, ANNEALING, HIGH FREQUENCY, PREAMPLIFIERS, HIGH PRESSURE, FREE FIELD, LEAD TITANATES, POLYURETHANE RESINS, REMOTE CONTROL, SONAR TRANSDUCERS, TRANSMITTER RECEIVERS, UNDERWATER SOUND SIGNALS, HYDROSTATIC PRESSURE, BROADBAND TRANSDUCERS, BUTYL RUBBER, GROMMETS

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE