05360268 is referenced by 94 patents and cites 10 patents.

A temperature measuring apparatus measures the temperature of a medium according to the propagation time of ultrasonic waves propagated for a predetermined distance through the medium. The apparatus has a transmitter 11, 12 for transmitting ultrasonic waves having a fixed frequency at predetermined timing and a receiver 13, 14, 15 for receiving the ultrasonic waves and providing a received signal. A delay time detector 24 detects, in response to the received signal, a delay time between the transmission and reception of the ultrasonic waves and a wave number calculator 21 calculates an integral wave number according to the delay time and a period of the ultrasonic waves. A phase difference detector 25 detects a phase difference between the transmitted and received ultrasonic waves modulating the received signal with a frequency that is sufficiently higher than the frequency of the ultrasonic waves. An operation unit 21 calculates the propagation time of the ultrasonic waves according to the wave number and phase difference, and according to the propagation time, the temperature of the medium. This apparatus has a wide range of measurable temperatures, and is capable of precisely measuring the temperature of a wide area of a medium.

Title
Ultrasonic temperature measuring apparatus
Application Number
8/143883
Publication Number
5360268
Application Date
November 1, 1993
Publication Date
November 1, 1994
Inventor
Kazutoshi Nishizawa
Toyoake
JP
Koji Numata
Toyokawa
JP
Yasushi Hayashi
Obu
JP
Agent
Cushman Darby & Cushman
Assignee
Nippondenso
JP
Nippon Soken
JP
IPC
G01K 11/22
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