Thermal measuring and testing – Temperature measurement – By a vibratory effect
Patent
1994-10-20
1997-04-29
Gutierrez, Diego F. F.
Thermal measuring and testing
Temperature measurement
By a vibratory effect
73597, G01K 1122, G01K 1124
Patent
active
056241887
ABSTRACT:
A thermometer using the temperature dependance of the speed of sound, measures the average temperature along a path traversing an open environment containing a medium. A transmitting transducer, coupled to a signal generator and placed at a first point in the medium, produces a burst of sound of predetermined frequency and duration. The sound burst travels through the medium to a second point, located a predetermined distance from the first. At the second point, a passive sound reflector, or an active apparatus, produces a returning sound burst. A receiving transducer, positioned close to the transmitting transducer, receives the returned sound. A detection circuit, coupled to the receiving transducer, indicates the presence of the returned sound burst. A timer, with connections to the signal generator and the detection circuit, measures the elapsed time for the round trip of the sound. The resulting time measurement is an indicator of the average temperature along the path between the first and second points. This time measurement is output for use by an electronic system, or processed to represent temperature directly.
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