公开(公告)号：US06578416B1

公开(公告)日：2003-06-17

申请号：US09658755

申请日：2000-09-08

申请人： Steven M. Vogel ,  John A. Sturm ,  Andrew M. Matulek ,  Clayton R. Mason ,  William C. Wolffe

发明人： Steven M. Vogel ,  John A. Sturm ,  Andrew M. Matulek ,  Clayton R. Mason ,  William C. Wolffe

IPC分类号： G01F2300

CPC分类号： G01F23/268 ,  G01F23/265 ,  G01F23/266

摘要： A self-compensating fluid level sensor is described, including a dual array of capacitive sensors on a dielectric substrate, the dual array of sensors forming multiple sensor pairs. Multiple signal detection circuits including comparators are configured to compare the capacitance of a first sensor pair with a second sensor pair. The internal capacitance comparisons allow the fluid level sensor to compensate for variations in the dielectric of the fluid being measured, as well as for manufacturing and materials variations that affect capacitive sensing. The passive level sensor also provides a platform for providing additional circuitry for providing additional information regarding the liquid, such as liquid composition.

摘要翻译： 描述了一种自补偿液位传感器，其包括电介质基底上的电容式传感器的双重阵列，形成多个传感器对的双重传感器阵列。 包括比较器的多个信号检测电路被配置为比较第一传感器对与第二传感器对的电容。 内部电容比较允许液位传感器补偿被测流体的电介质的变化，以及影响电容感测的制造和材料变化。 无源液位传感器还提供了一个平台，用于提供附加电路，以提供关于液体的附加信息，例如液体组成。