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10 October 2013 A novel DSSS based ToF measurement method for short baseline and its application in sound velocimeter
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Proceedings Volume 8916, Sixth International Symposium on Precision Mechanical Measurements; 89163N (2013) https://doi.org/10.1117/12.2035701
Event: Sixth International Symposium on Precision Mechanical Measurements, 2013, Guiyang, China
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.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shen Zhao, Yueke Wang, Chunjie Qiao, and Chao Zhou "A novel DSSS based ToF measurement method for short baseline and its application in sound velocimeter", Proc. SPIE 8916, Sixth International Symposium on Precision Mechanical Measurements, 89163N (10 October 2013); https://doi.org/10.1117/12.2035701
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