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公开(公告)号：US5321209A
公开(公告)日：1994-06-14
申请号：US994609
申请日：1992-12-17
CPC分类号： G01G3/16
摘要： A spring structure for a weight scale is described which is assembled from four extruded aluminum parts. The structure readily lends itself to the addition of a platform for placing weights and its deflection resulting from a weight is essentially invariant to the location of the weight on the platform. The sensor which converts deflection of the structure into an electrical signal includes two conducting plates, attached to the structure, which constitute a variable capacitor. The variable capacitor is part of a self-excited oscillator circuit which yields a frequency which is accurately related linearly to the value of the weight. Means are provided for distorting one of the capacitor plates to provide further improvement of invariance to weight location on the platform.
摘要翻译： 描述了用于重量级的弹簧结构，其由四个挤压的铝部件组装。 该结构容易地增加了用于放置重物的平台，并且其重量产生的偏转对于重量在平台上的位置基本上是不变的。 将结构的偏转转换为电信号的传感器包括两个连接到结构的导电板，构成可变电容器。 可变电容器是自激振荡器电路的一部分，其产生与重量值线性准确相关的频率。 提供了用于使电容器板之一变形的装置，以提供对平台上的重量位置的不变性的进一步改进。
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公开(公告)号：USRE32552E
公开(公告)日：1987-12-01
申请号：US206727
申请日：1980-11-14
申请人： Leonard Liebermann , Stanley H. Lai
发明人： Leonard Liebermann , Stanley H. Lai
IPC分类号： G01N27/70
CPC分类号： G01N27/70
摘要： A method .[.is disclosed.]. of detecting gaseous impurities, particularly halogens, in an ambient atmosphere by repeatedly pulsing a pair of electrodes disposed in that atmosphere with a voltage sufficient to cause a corona discharge in the continuous corona region, and detecting the average (d.c.) current component of such discharge, changes in which correspond to changes in the concentration of such gaseous impurities. Apparatus .[.is disclosed.]. for detecting such impurities in concentrations as low as 1 ppm.
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公开(公告)号：US5498873A
公开(公告)日：1996-03-12
申请号：US340266
申请日：1994-11-15
CPC分类号： G01N21/1702
摘要： A portable refrigeration gas analyzer employs infrared spectroscopy to detect adulterant refrigerant gases in existing R12 refrigeration systems. The analyzer can detect contaminants such as R134a, R22, and butane in concentration as low as 1% by volume. A rugged opto-acoustical infrared narrow band sensor is suitable for field use in the repair of refrigeration systems.
摘要翻译： 便携式制冷气体分析仪采用红外光谱法检测现有R12制冷系统中的掺杂制冷剂气体。 分析仪可以检测浓度低至1体积％的污染物，如R134a，R22和丁烷。 坚固的光声红外窄带传感器适用于制冷系统维修中的现场使用。
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公开(公告)号：US4719428A
公开(公告)日：1988-01-12
申请号：US741126
申请日：1985-06-04
申请人： Leonard Liebermann
发明人： Leonard Liebermann
CPC分类号： G01R31/3627
摘要： A condition tester for a storage battery that monitors the effect of internal battery resistance without drawing large currents. A switched load periodically draws a small current across the battery terminals. An AC voltage is produced at the battery terminals resulting from the oscillating current and the internal battery resistance. That small oscillating voltage is amplified, rectified and filtered to produce a DC voltage which depends upon the AC component. This DC voltage is subtracted from the nominal battery voltage and the difference is indicated by an appropriate meter. As the battery deteriorates its internal resistance increases causing the meter reading to decrease, thereby reflecting battery condition.
摘要翻译： 一种蓄电池状态测试仪，用于监测内部电池电阻的影响，而不会产生大电流。 开关负载周期性地在电池端子上吸引小电流。 在振荡电流和内部电池电阻引起的电池端子处产生交流电压。 该小振荡电压被放大，整流和滤波以产生取决于AC分量的DC电压。 该直流电压从标称电池电压中减去，差值由适当的仪表表示。 随着电池劣化，其内阻增加，导致抄表减小，从而反映电池状况。
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