Piezoelectric Ceramic Hydrostatic Sound Sensor.
Patent, filed 5 Dec 90, patented 2 Mar 93,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A piezoelectric ceramic hydrostatic sound sensor or transducer having high sensitivity to hydrostatic pressure is made by placing a flat plastic disc between two flat layers of green ceramic material, compressing and fusing the layers, heating to a first temperature at which the plastic decomposes, leaving a flat void in the ceramic, and heating to a second temperature at which the ceramic sinters. The transducer is provided with electrodes on its top and bottom surfaces. In a further improvement, ceramic particles are provided which are entrapped in the void they render the sound sensor sensitive to inertial forces. In yet another improvement, the inside walls of the void are coated with a conductive noble metal connected to a terminal wire, whereby an additional electrode is provided for sensing the electromechanical response of the transducer.
- *CERAMIC MATERIALS
- *PIEZOELECTRIC MATERIALS
- HIGH SENSITIVITY
- HYDROSTATIC PRESSURE
- INERTIAL SYSTEMS
- METAL COATINGS
- ELECTROMECHANICAL DEVICES
- Fluid Mechanics
- Electricity and Magnetism
- Acoustic Detection and Detectors