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Proceedings Paper

A novel DSSS based ToF measurement method for short baseline and its application in sound velocimeter
Author(s): Shen Zhao; Yueke Wang; Chunjie Qiao; Chao Zhou
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Paper Abstract

The short baseline framework is commonly used in ultrasonic parameter measurement, and ToF (time of flight) of which is essential in sound velocimeter and other applications. Different from conventional steady-state and transient methods, this paper proposed a new method using DSSS (Direct Sequence Spread Spectrum) signal to extract the ToF. DSSS signal possesses excellent auto-correlation features, thus it does not need to adjust path-length or the acoustic frequency, nor avoid the impact of the multiple echoes. The DSSS signal and measurement system are modeled and the detailed theoretical process of ToF estimation is derived to demonstrate the measurement principles, and the principles of echoesresistance are analyzed. Measurement experiments are carried out using distilled water at ambient pressure with temperature ranging from 19°C to 30°C. The test results indicate that the relative precision of ToF is in bounds of 2 ppm and the bias of sound speed derived is within 0.06m/s compared to Del Grosso's equation.

Paper Details

Date Published: 10 October 2013
PDF: 10 pages
Proc. SPIE 8916, Sixth International Symposium on Precision Mechanical Measurements, 89163N (10 October 2013); doi: 10.1117/12.2035701
Show Author Affiliations
Shen Zhao, National Univ. of Defense Technology (China)
Yueke Wang, National Univ. of Defense Technology (China)
Chunjie Qiao, National Univ. of Defense Technology (China)
Chao Zhou, National Univ. of Defense Technology (China)

Published in SPIE Proceedings Vol. 8916:
Sixth International Symposium on Precision Mechanical Measurements
Shenghua Ye; Yetai Fei, Editor(s)

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