This device has a compact construction where the emitting-light sources and the detectors are located face-to-face on the same optical axis. The detector consists of a phototransistor Transmitter is positioned opposite the receiver used for small distances and narrow objects.
• Emitting light is influenced by an object on its way to the detector
• Known as transmissive sensors or interrupters or slotted switch or optical switch or reflective sensors
• Change of the light signal causes a change in the electrical signal in the receiver
3.2.1 Working of photo sensor
The basic elements of an optical transmissive sensor also known as Photo interrupter are an emitter and a photo detector. Typically an IRED (Infrared emitting diode) and a phototransistor is used. Figure 7 shows a typical circuit. The anode of IRED is connected to the power supply via the resistor 680R and the cathode is grounded. The resistor adjusts the irradiance by limiting the forward current of the IRED.
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