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|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||G01L-007/08 G01L-011/00 G01L-019/04|
|미국특허분류(USC)||73/703 ; 73/708 ; 73/717|
|발명자 / 주소||
|출원인 / 주소||
|인용정보||피인용 횟수 : 4 인용 특허 : 3|
A pressure sensor for accurate readings of low pressures utilizes an ultrasonic transmitter which sends a signal to a movable diaphragm via a waveguide. Pressure changes across the diaphragm causes changes in the signal path length from transmitter to receiver which are translated into pressure readings via electronic circuitry employing phase comparator circuitry. The received signal is split into two signals one of which is shifted in phase. A temperature responsive controller selects which received signal is used in a comparison with the transmitted s...
A pressure sensor comprising a housing, a sonic transmitter mounted inside said housing, oscillator means for driving said transmitter, a sonic receiver mounted inside said housing, a sonic reflector mounted in said housing in a signal path between said transmitter and said receiver, said reflector being movably responsive to pressure for causing changes in length of said signal path between said reflector and said receiver, means to substantially inhibit the creation of echoes and extraneous reflections of said signal within said housing, and circuit me...