| 摘要 |
<p>The optical displacement sensor (10) modulates intensity of the light beam as a function of the physical displacement. The sensor includes a reflector (24) positioned in a path of the light beam between a light source (12) and a light detector (14). The reflector (24) has a non-reflective portion (28) surrounded by a reflective portion (26). Relative movement (displacement) of the beam and the reflector occurs as a function of a parameter which is being sensed. In a normal (no displacement) condition, the non-reflective portion (28) can be positioned with respect to the light beam so that intensity of the light beam received by the detector (14) is at a minimum, and the sensor (14) is operating in a darkfield mode. Displacement from the normal position causes an increase in the light intensity received by the detector (14).</p> |
