A novel DSSS based ToF measurement method for short baseline and its application in sound velocimeter

Shen Zhao; Yueke Wang; Chunjie Qiao; Chao Zhou

doi:10.1117/12.2035701

10 October 2013 A novel DSSS based ToF measurement method for short baseline and its application in sound velocimeter

Shen Zhao, Yueke Wang, Chunjie Qiao, Chao Zhou

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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available