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1. 发明授权

US6116080A Apparatus and methods for performing acoustical measurements 失效
标题翻译：用于进行声学测量的装置和方法
公开(公告)号：US6116080A
公开(公告)日：2000-09-12
申请号：US62112
申请日：1998-04-17
申请人： Raymond C. Logue , Don N. Sirota , Patrick S. Lee
发明人： Raymond C. Logue , Don N. Sirota , Patrick S. Lee
IPC分类号： G01N29/024 , G01N29/22 , G01N29/46 , G01N29/50 , G01N7/00
CPC分类号： G01N29/50 , G01N29/024 , G01N29/222 , G01N29/449 , G01N29/46 , G01N2291/02809 , G01N2291/102
摘要： Apparatus and methods for performing acoustical measurements are provided having some and preferably all of the following features: (1) the system is operated under near-field conditions; (2) the piezoelement or piezoelements used in the system are (a) mechanically and electrically damped and (b) efficiently electrically coupled to the signal processing components of the system; (3) each piezoelement used in the system includes an acoustical transformer for coupling the element to a gaseous test medium; (4) speed of sound is determined from the time difference between two detections of an acoustical pulse at a receiver; (5) cross-correlation techniques are employed to detect the acoustical pulse at the receiver; (6) fast Fourier transform techniques are used to implement the cross-correlation techniques; and (7) stray path signals through the body of the acoustic sensor are removed from detected signals prior to signal analysis. Techniques are also provided for performing acoustical measurements on gases whose thermodynamic properties have not been measures and on mixtures of compressible gases. Methods and apparatus for performing feedback control of a gas of interest in a mixture of that gas and a carrier gas are provided in which the controlled variable is the flow of the carrier gas.
摘要翻译：提供用于执行声学测量的装置和方法具有一些并且优选地具有以下所有特征：（1）系统在近场条件下操作; （2）在系统中使用的压电元件或压电元件是（a）机械和电阻尼，（b）有效地电耦合到系统的信号处理部件; （3）系统中使用的每个压电元件包括用于将元件耦合到气体测试介质的声学变压器; （4）声音速度由接收机的声音脉冲的两次检测之间的时间差确定; （5）互相关技术用于检测接收机的声脉冲; （6）快速傅里叶变换技术用于实现互相关技术; 和（7）通过声学传感器的主体的杂散路径信号在信号分析之前从检测到的信号中去除。还提供了用于对其热力学性质未被测量的气体和可压缩气体的混合物进行气体测量的技术。提供了用于对该气体和载气的混合物中感兴趣的气体进行反馈控制的方法和装置，其中受控变量是载气的流动。

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