公开(公告)号：US06271523B1

公开(公告)日：2001-08-07

申请号：US09520708

申请日：2000-03-07

申请人： John D. Weaver ,  Gary Moman

发明人： John D. Weaver ,  Gary Moman

IPC分类号： G08S2300

CPC分类号： G01D5/40 ,  G01D4/002 ,  G01D4/008 ,  Y02B90/241 ,  Y02B90/245 ,  Y02B90/247 ,  Y04S20/32 ,  Y04S20/40 ,  Y04S20/50

摘要： An optical sensor for monitoring a utility meter having a sweep hand indicator that moves over a meter surface of the utility meter. The optical sensor has a single infrared light emitter and two photo diodes detectors. The infrared light emitter is positioned at an angle with respect the meter surface and the sweep hand indicator of the utility meter so that the sweep hand indicator is illuminated from an angle to provide a shadow of the sweep hand indicator. The photo detectors detect changes in the intensity of light reflected on the sweep hand indicator and the background surface as well as the shadow of the sweep hand indicator. The two photo diode detectors are electrically coupled in series but in opposite directions relative to an output node, so as to cancel each other at the output node in normal operation. The passing of the sweep hand indicator changes the signal produced of each of the photo diode detectors at the output node, independently but in opposite directions.

摘要翻译： 一种光学传感器，用于监测具有在公用事业仪表的仪表表面上移动的扫掠指示器的公用事业仪表。 光学传感器具有单个红外光发射器和两个光电二极管检测器。 红外光发射器相对于仪表表面和效用表的扫掠指示器定位成一角度，使得扫掠指示器从一角度照亮以提供扫掠指示器的阴影。 光检测器检测扫描指示器和背景表面上反射的光强度以及扫描指示器的阴影的变化。 两个光电二极管检测器相对于输出节点串联电耦合在相反的方向上，以便在正常操作中在输出节点彼此抵消。 扫掠指示器的通过将输出节点上的每个光电二极管检测器产生的信号独立地但相反地改变。