High temperature pressure transducers and systems for determining deflection of pressure transducer diaphragms.

摘要

A high temperature pressure transduced and sensing apparatus to determine deflection of a diaphragm of the transducer are disclosed. The pressure transducer utilizes a fused silica diaphragm (12) which is illuminated at selected locations by a coherent laser source (52) via optical fibres (38, 46). The light reflected by the diaphragm (12) forms interference fringe patterns which are focused by gradient index rod lenses (36) on the ends of optical fibres (40, 48) for transmission to a fringe counting circuit (54). By digital techniques, the fringe count is converted into a determination of diaphragm deflection.