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Title: A High Precision Ultrasonic System For Fast Temperature Measurements Of Indoor Air
Author: C. F. Huang, K. N. Huang, m. S. Young, Y. C. Li
Source: 2002 Measurement Science Conference
Year Published: 2002
Abstract: A high accurate continuous wave (CW) ultrasonic system used in air temperature measurement is described. Two ultrasonic transducers, a transmitter and a receiver, are set face to face and fixed at a constant distance. In operation, a 40-kHz ultrasound will be transmitted from the ultrasonic transmitter continuously and received by the ultrasonic receiver simultaneously. When the distance between the transmitter and the receiver is 1m, the temperature range determined by the difference of phase shift from 0 to 2p is only 5 ?. We have developed an ingenious method to reconstruct the temperature from the acquired data of the phase difference changes when the range of the fluctuation of the temperature exceeds 5 ?. The measured accuracy of the sound speed and the temperature are within 0.005 m/s and 0.01 ?respectively. The main advantages of this ultrasonic temperature measurement system are high resolution, low cost, and it can measure temperature distribution of long-range zone.

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