Piezoelectric pressure sensor

A pressure and temperature sensor comprising:

• an inner conductor comprising a metallic helix and a plurality of small insulating polymer fibers,
• a piezoelectric composite layer surrounding the inner conductor, the composite layer comprising amorphous chlorinated polyethylene (CPE), crystalline CPE and piezoelectric ceramic powder,
• an outer conductor surrounding and contacting the piezoelectric composite layer but separated from the inner conductor, and
• a protective jacket comprising an insulating elastic material, the jacket surrounding said outer conductor.

A pressure and temperature detecting apparatus comprising a sensor, a pressure detecting means, and a temperature detecting means, wherein:

• the sensor comprises:
• an inner conductor having two ends,
• a piezoelectric composite layer surrounding the inner conductor, the piezoelectric composite layer comprising chlorinated polyethylene and piezoelectric ceramic powder,
• an outer conductor surrounding and contacting the piezoelectric composite layer, and
• a protective jacket comprising an insulating elastic material, the jacket surrounding the polymer membrane;
• the pressure detecting means contacts the inner and outer conductors;
• and
• the temperature detecting means connects to the two ends of the inner conductor.