Temperature measuring apparatus with alarm device

Details Temperature measuring apparatus with alarm device Temperature measuring apparatus with alarm device

1979-02-23

1981-03-03

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Plural transmitters to receiver or transmitter to plural...

367136, 73339A, G01K 1124

Patent

active

042544858

ABSTRACT:
A temperature measuring apparatus includes a transmitter for continuously transmitting an ultrasonic wave into a propagation medium the temperature of which is to be measured. Two receivers are located along an ultrasonic wave propagation path spaced from each other by a predetermined distance. A phase difference between the ultrasonic waves received by the two receivers is detected as a pulse width which varies depending on a propagation velocity of the wave and hence a temperature of the propagation medium. An obstacle detecting and alarming circuit is provided to detect the presence of an obstacle between the transmitter and the receivers by detecting the absence of the phase difference signal.

REFERENCES:
patent: 3717033 (1973-02-01), Gordon et al.

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