公开(公告)号：EP1429122A1

公开(公告)日：2004-06-16

申请号：EP03257310.7

申请日：2003-11-19

申请人： Simmonds Precision Products, Inc.

发明人： Durkee, Scott Robert ,  Coffman, Keith Eugene

IPC分类号： G01F23/24

CPC分类号： G01F23/247

摘要： A method of detecting a dry/wet state of a dual thermistor bead sensor over a wide operating temperature range comprises the steps of: conducting first and second predetermined currents through one and another of the thermistor beads of the sensor, respectively, the second predetermined current being substantially less than the first predetermined current; measuring a first voltage across the one thermistor bead in response to the first predetermined current and generating a first signal representative thereof; measuring a second voltage across the other thermistor bead in response to the second predetermined current and generating a second signal representative thereof; modifying the second signal by an offset and gain to generate a third signal; and detecting the dry/wet state of the sensor over the wide operating temperature range based on the first and third signals. The first predetermined current is conducted through the one thermistor bead at an average current which renders the one thermistor bead a sense thermistor bead, and the second predetermined current is conducted through the other thermistor bead at an average current which renders the other thermistor bead a reference thermistor bead. Apparatus for implementing this method is also disclosed.

摘要翻译： 在很宽的工作温度范围内探测一个双热敏电阻珠传感器的干/湿状态的方法包括以下步骤：通过一个和另一个的传感器的热敏电阻珠传导第一和第二预定电流，分别地，第二预定电流 基本上小于所述第一预定电流; 测量跨越热敏电阻珠一第一电压以响应于所述第一预定电流，并产生它们的第一信号代表; 测量跨越其它热敏电阻珠的第二电压响应于所述第二预定电流，并产生它们的第二信号代表; 修改所述第二信号通过在偏移和增益，以产生一第三信号; 和检测所述传感器的干/湿状态基于对所述第一和第三信号中的工作温度范围宽。 第一预定电流通过一个热敏电阻珠在传导在平均电流这使得所述一个热敏电阻珠感热敏电阻珠，并且所述第二预定电流通过其它热敏电阻珠处的平均电流这使得其它热敏电阻珠基准传导 热敏电阻珠。 因此，一种用于实现该方法是游离缺失盘。