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1. 发明授权

US5768937A Acoustic sensor for in-line continuous monitoring of gasses 失效
标题翻译：用于气体连续监测的声学传感器
公开(公告)号：US5768937A
公开(公告)日：1998-06-23
申请号：US748599
申请日：1996-11-13
申请人： Abdul Wajid , Clarence Hurd , Melvin C. Hetzel
发明人： Abdul Wajid , Clarence Hurd , Melvin C. Hetzel
IPC分类号： G01F1/66 , G01N29/036 , G01N29/22 , G01F17/00
CPC分类号： G01N29/036 , G01F1/662 , G01F1/667 , G01N29/22 , G01N2291/0222 , G01N2291/02836 , G01N2291/02881
摘要： An acoustic cell includes multiple acoustic cavities fluidly coupled together. At least two of the acoustic cavities have unequal lengths and cross sections. End segments of the acoustic cell are uniformly cylindrically shaped or conically shaped. A driver transducer at one end of the acoustic cell and a receiver transducer at another end of the acoustic cell are acoustically isolated from the acoustic cell. A pair of preferably metallic isolation diaphragms transmit acoustic signals to and from the transducers without significantly altering the phase-frequency characteristics of the acoustic signals. The acoustic cell operates as an acoustic resonator operating at frequencies lower than any possible self-resonance frequencies of the isolation diaphragms or the driver and receiver transducers. When a binary gas is flowed through the cell, a processor detects a resonant frequency of the gas within the cell to determine a composition of the gas.
摘要翻译：声学单元包括流体耦合在一起的多个声腔。至少两个声腔具有不相等的长度和横截面。声学单元的端部段是均匀的圆柱形或圆锥形的。在声学单元的一端处的驱动器换能器和声学单元的另一端处的接收器换能器与声学单元进行声学隔离。一对优选的金属隔离膜片将声信号传递到换能器而不显着地改变声信号的相位频率特性。声学单元作为声学谐振器工作，频率低于隔离隔膜或驱动器和接收器换能器的任何可能的自谐振频率。当二进制气体流过电池时，处理器检测电池内的气体的共振频率以确定气体的组成。

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