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the type of application. The certification will ensure the device has been tested and approved for certain uses. Intangibles. These can include the availability of application support and service, the supplier s reputation, local availability, and quality testing statements from the manufacturer.
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An LED is a semiconductor that emits a small amount of light when current flows through it in the forward direction. In most photoelectric sensors, LEDs are used both as emitters for sensing beams and as visual indicators of alignment or output status for a manufacturing process. Most sensor manufacturers use visible red, visible green, or infrared (invisible) LEDs (Fig. 3.4b). This simple device plays a significant part in industrial automation. It provides instantaneous information regarding an object during the manufacturing operation. LEDs, together with fiber optics, allow a controller to direct a multitude of tasks, simultaneously or sequentially.
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3.8 Sensor Alignment Techniques
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A sensor should be positioned so the maximum amount of emitted energy reaches the receiver element in one of three different modes: Opposed sensing mode Retroreflective sensing mode Proximity (diffuse) sensing mode
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In the opposed sensing mode, the emitter and receiver are positioned opposite each other so that the light from the emitter shines directly at the receiver. An object then breaks the light beam that is established between the two. Opposed sensing is always the most reliable mode.
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Retroreflective sensing is also called the reflex mode or simply the retro mode. A retroreflective photoelectric sensor contains both emitter and receiver. A light beam is established between the sensor and a special retroreflective target. As in opposed sensing, an object is sensed when it interrupts this beam. Retro is the most popular mode for conveyer applications where the objects are large (boxes, cartons, etc.), where the sensing environment
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is relatively clean, and where scanning ranges are typically a few meters in length. Retro is also used for code-reading applications. Automatic storage and retrieval systems and automatic conveyer routing systems use retroreflective code plates to identify locations and/or products.
Proximity (Diffuse) Sensing Mode
In the proximity (diffuse) sensing mode, light from the emitter strikes a surface of an object at some arbitrary angle and is diffused from the surface at all angles. The object is detected when the receiver captures some small percentage of the diffused light. Also called the direct reflection mode or simply the photoelectric proximity mode, this method provides direct sensing of an object by its presence in front of a sensor. A variation is the ultrasonic proximity sensor, in which an object is sensed when its surface reflects a sound wave back to an acoustic sensor.
Divergent Sensing Mode
The divergent sensing mode is a variation of the diffuse photoelectric sensing mode in which the emitted beam and the receiver s field of view are both very wide. Divergent mode sensors (Fig. 3.27) have loose alignment requirements, but have a shorter sensing range than diffuse mode sensors of the same basic design. Divergent sensors are particularly useful for sensing transparent or translucent materials or for sensing objects with irregular surfaces (e.g., webs that flutter). They are also used effectively to sense objects with very small profiles, such as small-diameter thread or wire, at close range. All unlensed bifurcated optical fibers are divergent. The divergent mode is sometimes called the wide-beam diffuse (or proximity) mode.
FIGURE 3.27
Divergent sensing mode.
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Convergent Sensing Mode
The convergent sensing mode is a special variation of diffuse mode photoelectric proximity sensing that uses additional optics to create a small, intense, and well-defined image at a fixed distance from the front surface of the sensor lens (Fig. 3.28). Convergent beam sensing is the first choice for photoelectric sensing of transparent materials that remain within a sensor s depth of field. It is also called the fixedfocus proximity mode.
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