JPS5735741A - Pressure measuring element - Google Patents

Abstract

PURPOSE:To measure exactly pressure in the direction of the diameter of an electric wire, by covering a good conductive electric material whose specific resistance is small, with a pressure sensitive conductor whose conductivity is varied by pressure, and furthermore covering its outside with a good conductive thin film. CONSTITUTION:The circumference of a metallic wire whose specific resistance is small, such as copper, aluminum, etc. is covered with a material whose conductivity is varied by pressure, for instance, a pressure sensitive conductor 2 which has mixed carbon black mixed rubber metallic particles in silicon rubber, and furthermore its outside is covered with a good conductor 3 such as gold, silver, copper, aluminum, etc. In this regard, then its outside is covered with an insulation layer 4 such as plastic, etc., it is convenient for handling. In this way, when this pressure measuring elementis incorporated in an optical fiber cable together with an optical fiber, a tension member, a buffer material, etc., a measurement of pressure in the direction of the diameter of the cable is executed exactly.