| 摘要 |
PURPOSE:To make small a pressure sensor and thereby to facilitate the handling thereof by a construction wherein an ultrasonic oscillator and an ultrasonic wave receiver are disposed at a relatively small distance from each other inside vessel, and a pressure inside the vessel is detected from an output of the ultrasonic wave receiver. CONSTITUTION:An ultrasonic oscillator 2 and an ultrasonic wave receiver 3 are disposed opposite to each oher at a relatively small distance, e.g. a distance of 4mm., between them in a vessel 1. An ultrasonic wave emitted from the ultrasonic oscillator 2 is received by the ultrasonic wave receiver 3, an output of this receiver is amplified by an amplifier 5, the amplitude of an output signal of the amplifier 5 is detected by an oscilloscope 6, and thereby the intensity of the ultrasonic wave emitted from the ultrasonic oscillator 2 to the receiver 3 is detected. The intensity of the ultrasonic wave changes in substantially linear relation to a change of a pressure inside the vessel 1, and therefore the pressure inside the vessel 1 can be detected by detecting the intensity of the ultrasonic wave which enters the receiver 3. |
