摘要
在时差法、相位法等声速测量方法中,由换能器群延时引起的系统非线性相位响应是制约声速测量精度的重要因素。采用窄带线性模型近似描述换能器工作频段内的相位响应曲线,并分别通过相关检测与多频点测量的实验方法对模型加以验证。结果表明:窄带线性模型与换能器工作频段内的实际相位响应吻合良好,可用于准确估计声速。
In acoustic velocity measurement method, based on TDOA or PDOA, nonlinear phase response caused by group delay of transducer is a major factor that limits measurement precision. A narrowband linear model is adopt to describe the phase response curve in working band of transducer, and verifies through correlation detection and multi-frequency point measurement experimental methods. Results show that the narrowband linear model is agreeable with real phase response of transducer in working frequency band, and can used to accurately estimate acoustic velocity.
出处
《传感器与微系统》
CSCD
北大核心
2013年第3期74-77,共4页
Transducer and Microsystem Technologies
关键词
声速测量
换能器
群延时
窄带线性模型
acoustic velocity measurement
transducer
group-delay
narrowband linear model
