公开(公告)号：US20090113997A1

公开(公告)日：2009-05-07

申请号：US12273657

申请日：2008-11-19

申请人： Kenjiro OKAGUCHI ,  Takuo HADA ,  Michio KADOTA

发明人： Kenjiro OKAGUCHI ,  Takuo HADA ,  Michio KADOTA

IPC分类号： G01N29/02

CPC分类号： G01N29/022 ,  G01N2291/014 ,  G01N2291/0255 ,  G01N2291/0256 ,  G01N2291/0423 ,  G01N2291/0425

摘要： A sensor for detecting a substance in liquid includes a sensing oscillation circuit and a reference oscillation circuit. The sensing oscillation circuit includes a sensing SAW element in which a reaction film arranged so as to cover at least one IDT and to react with a substance in liquid is disposed and a first amplifier circuit. The reference oscillation circuit includes a reference SAW element and a second amplifier circuit. The reference SAW element includes at least one IDT and no reaction film. The oscillation frequency of the sensing oscillation circuit and the oscillation frequency of the reference oscillation circuit are separated by at least about 200×k2 (ppm), where k2 (%) is the electromechanical coupling coefficient of a piezoelectric substrate used in each of the sensing SAW element and the reference SAW element.

摘要翻译： 用于检测液体中的物质的传感器包括感测振荡电路和参考振荡电路。 感测振荡电路包括感测SAW元件，其中布置成覆盖至少一个IDT并与液体中的物质反应的反应膜和第一放大器电路。 参考振荡电路包括参考SAW元件和第二放大器电路。 参考SAW元件包括至少一个IDT并且没有反应膜。 感测振荡电路的振荡频率和参考振荡电路的振荡频率分开至少约200xk2（ppm），其中k2（％）是在每个感测SAW元件中使用的压电基板的机电耦合系数 和参考SAW元件。

公开(公告)号：US20090060790A1

公开(公告)日：2009-03-05

申请号：US12273569

申请日：2008-11-19

申请人： Kenjiro OKAGUCHI ,  Takuo HADA ,  Michio KADOTA

发明人： Kenjiro OKAGUCHI ,  Takuo HADA ,  Michio KADOTA

IPC分类号： B01J19/00

CPC分类号： G01N29/022 ,  G01N2291/0255 ,  G01N2291/0256 ,  G01N2291/0423

摘要： A sensor for detecting a substance in liquid includes a sensing circuit including a sensing surface acoustic wave (SAW) element in which a reaction film to react with a substance in liquid, a reference circuit including a reference SAW element including an IDT and not including a reaction film, a first signal source driving the sensing circuit, a second signal source driving the reference circuit and being independent of the first signal source, and a differential circuit arranged to output a differential output between an output of the sensing circuit and an output of the reference circuit. The frequency of a first frequency signal output from the first signal source is different from the frequency of a second frequency signal output from the second signal source, thereby making a driving frequency for the sensing SAW element and a driving frequency for the reference SAW element substantially the same as or different from one another.

摘要翻译： 用于检测液体中的物质的传感器包括感测电路，其包括感测声表面波（SAW）元件，其中反应膜与液体中的物质反应，参考电路包括包括IDT的参考SAW元件，并且不包括 反应膜，驱动感测电路的第一信号源，驱动参考电路并独立于第一信号源的第二信号源，以及差分电路，布置成在感测电路的输出和输出之间输出差分输出 参考电路。 从第一信号源输出的第一频率信号的频率与从第二信号源输出的第二频率信号的频率不同，从而使感测用SAW元件的驱动频率和基准SAW元件的驱动频率基本上 彼此相同或不同。