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    • 98. 发明授权
    • Chemical sensor and coating for same
    • 化学传感器和涂层相同
    • US06237397B1
    • 2001-05-29
    • US09413628
    • 1999-10-06
    • Ruth ShinarGuojun LiuMarc D. Porter
    • Ruth ShinarGuojun LiuMarc D. Porter
    • G01N2902
    • G01N29/022G01N2291/014G01N2291/0256G01N2291/02863G01N2291/0423G01N2291/0426G01N2291/0427
    • An acoustic wave based-chemical sensor containing a crystal substrate and a coating of small particulate matter is disclosed. The small particulate matter can be graphite particles. Transducers are connected to the crystal substrate to generate an alternating potential across the crystal substrate, which in turn causes the crystal to resonate due to the converse piezoelectric effect. The coating absorbs the analyte, thus changing the mass of the sensor, and accordingly changing its resonant frequency. The transducers detect this change in resonant frequency to indicate that the analyte is present. The use of small particulate matter results in a coating having a large surface area which facilitates mass uptake of large amounts of VOCs, improved acoustic properties even with relatively thick coatings, and a high operational temperature range.
    • 公开了一种包含晶体衬底和小颗粒物质涂层的基于声波的化学传感器。 小颗粒物可以是石墨颗粒。 传感器连接到晶体衬底以在晶体衬底之间产生交替电位,这又导致晶体由于相反的压电效应而谐振。 涂层吸收分析物,从而改变传感器的质量,从而改变其共振频率。 传感器检测谐振频率的这种变化,以表明分析物存在。 使用小的颗粒物质可形成具有大表面积的涂层,其有利于大量挥发性有机物的吸收,甚至在相对较厚的涂层和较高的操作温度范围内也改善了声学性能。
    • 100. 发明授权
    • System and method for preconcentrating, identifying, and quantifying
chemical and biological substances
    • 预浓缩,鉴定和定量化学和生物物质的系统和方法
    • US6134944A
    • 2000-10-24
    • US302047
    • 1999-04-29
    • Conrad M. YuJackson C. Koo
    • Conrad M. YuJackson C. Koo
    • G01N1/40G01N29/02G01N30/12G01N29/18G01N31/06
    • G01N29/022G01N30/12G01N1/40G01N2030/121G01N2291/02466G01N2291/0256G01N2291/0423G01N2291/0426
    • A system and method for preconcentrating, identifying, and quantifying chemical and biological substances is disclosed. An input valve directs a first volume of a sample gas to a surface acoustic wave (SAW) device. The SAW device preconcentrates and detects a mass of a substance within the sample gas. An output valve receives a second volume of the sample gas containing the preconcentrated substance from the SAW device and directs the second volume to a gas chromatograph (GC). The GC identifies the preconcentrated substance within the sample gas. A shunt valve exhausts a volume of the sample gas equal to the first volume minus the second volume away from the SAW device and the GC. The method of the present invention includes the steps of opening an input valve for passing a first volume of a sample gas to a SAW device; preconcentrating and detecting a mass of a substance within the sample gas using the SAW device; opening an output valve for passing a second volume of the sample gas containing the preconcentrated substance to a gas chromatograph (GC); and then identifying the preconcentrated substance within the sample gas using the GC.
    • 公开了一种用于预浓缩,鉴定和定量化学和生物物质的系统和方法。 输入阀将第一体积的样品气体引导到表面声波(SAW)装置。 SAW器件预浓缩并检测样品气体中物质的质量。 输出阀从SAW装置接收含有预浓缩物质的样品气体的第二体积,并将第二体积引导至气相色谱仪(GC)。 GC识别样品气体中的预浓缩物质。 分流阀排出等于第一容积的样品气体的体积减去远离SAW器件和GC的第二体积。 本发明的方法包括以下步骤:打开用于将第一体积样品气体传递到SAW器件的输入阀; 使用SAW器件预浓缩和检测样品气体内的物质的质量; 打开输出阀,用于将含有预浓缩物质的第二体积的样品气体通入气相色谱仪(GC); 然后使用GC鉴定样品气体中的预浓缩物质。