公开(公告)号：US4662212A

公开(公告)日：1987-05-05

申请号：US752535

申请日：1985-07-08

申请人： Yasuo Noguchi ,  Morito Idemoto ,  Fumiaki Matsunaga

发明人： Yasuo Noguchi ,  Morito Idemoto ,  Fumiaki Matsunaga

IPC分类号： G01N29/024 ,  G01N29/02

CPC分类号： G01N29/024 ,  G01N2291/02809

摘要： A gas concentration measuring instrument using the dependency of the propagation velocity of ultrasonic wave propagating in gas on the gas concentration incorporates a dampproof ultrasonic sensor with a metal or the like deposited by evaporation on the surface of the sealing material. Therefore, this gas concentration measuring instrument is almost not affected by the change of temperature and humidity and can precisely measure gas concentration continuously for a long period of time under high humidity. The ultrasonic sensor is formed fundamentally by an ultrasonic vibrator, a holder and a sealing material. More preferably, this sensor is embedded in a block and sealed with an elastic sealing material and a film of conductive material and/or a nonconductive material is formed on the surface of the sealing material, the elastic sealing material, the vibrating end surface of the ultrasonic sensor and the end surface of the block.

摘要翻译： 使用在气体中传播的超声波的传播速度的依赖性对气体浓度的气体浓度测量仪器具有通过蒸发沉积在密封材料的表面上的具有金属等的防潮超声波传感器。 因此，该气体浓度测定仪几乎不受温度和湿度的变化的影响，能够在高湿度下长时间连续精确测量气体浓度。 超声波传感器由超声波振动器，保持器和密封材料基本形成。 更优选地，该传感器嵌入块中并用弹性密封材料密封，并且在密封材料的表面上形成导电材料和/或非导电材料的膜，弹性密封材料，振动端面 超声波传感器和块体的端面。