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1. 发明授权

US5969243A Humidity sensor for capacitive measurement of humidity in bulk material 失效
标题翻译：湿度传感器用于散装材料的湿度电容测量
公开(公告)号：US5969243A
公开(公告)日：1999-10-19
申请号：US905928
申请日：1997-08-05
申请人： Werner Frey , German Gotz
发明人： Werner Frey , German Gotz
IPC分类号： G01N27/22 , G01R27/26 , G01N27/12
CPC分类号： G01N27/223
摘要： The invention relates to a humidity sensor for capacitive measurement of the humidity contained in a material, predominantly a bulk product. For parallel operation of several humidity sensors, one individual humidity sensor has to fulfil particularly high requirements with regard to accuracy, sensitivity and interchangeability. These requirements are fulfilled by the humidity sensor as per the invention firstly in that at least one pole of a stray field condenser arranged in the humidity sensor is fitted as a conductive layer on the side of a closer plate in the casing of the humidity sensor which is turned away from the material or bulk product. Furthermore, there is arranged in the casing a digital arithmetic-logic unit which exhibits a calibration table stored in a digital memory for determination of humidity levels as a function of measurement signals in a capacity measurement circuit which measures the capacity of the stray field condenser and of interference values affecting the humidity sensor. A further increase in precision, finally, is achieved in that the capacity measurement circuit exhibits an amplitude stabilizer such that the voltage on the stray field condenser is constant over time.
摘要翻译：本发明涉及一种湿度传感器，用于电容测量包含在主要是散装产品的材料中的湿度。对于几个湿度传感器的并联操作，一个单独的湿度传感器在精度，灵敏度和可互换性方面必须满足特别高的要求。这些要求由本发明的湿度传感器实现，其首先是布置在湿度传感器中的杂散场冷凝器的至少一个极作为导电层装配在湿度传感器的壳体中的更靠近的板的侧面上被转移离开材料或散装产品。此外，在壳体中布置有数字算术逻辑单元，其显示存储在数字存储器中的校准表，用于在测量杂散场冷凝器的容量的容量测量电路中作为测量信号的函数来确定湿度水平，影响湿度传感器的干扰值。实现精度的进一步提高，其中容量测量电路呈现稳定器，使得杂散场冷凝器上的电压随时间变化。

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