A NOVEL TECHNIQUE TO MEASURE THE GROUP-VELOCITY OF SOUND IN DISPERSIVE MEDIA

被引：0
|
作者：
ZHAO, Z [1 ]
ADENWALLA, SD [1 ]
KETTERSON, JB [1 ]
SARMA, BK [1 ]
机构：
[1] UNIV WISCONSIN,DEPT PHYS,MILWAUKEE,WI 53211
来源：
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 1989年 / 36卷 / 05期
基金：
美国国家科学基金会;
关键词：
Frequency Modulation - Signal Generators - Ultrasonic Waves--Transmission;
D O I：
10.1109/58.31791
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
A technique is proposed for measuring the group velocity of sound by a frequency-modulated (FM) continuous wave (CW) technique. Detailed calculations are presented, showing that Vg = (δωm/δφ)d, where Vg, δωm, δφ, and d are, respectively, the group velocity, change of modulation frequency, phase change of the received signal detected by a biphase lock-in amplifier, and the distance traveled by the sound. The approach has the advantage of high resolution compared to the conventional time-of-flight measurement technique.
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页码：481 / 484
页数：4
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