Through Beam Sensor Operation

When a sensing object passing between the emitter and receiver interrupts the emitted light it reduces the amount of light that enters the receiver.

Through beam sensor operation.

Conceptual through beam system to detect unauthorized access to a secure door. The sensing range is fixed and defined as the focus point. The sensor is then able to detect an object at this focal point plus or minus some distance known as the sensing window. Item explanatory diagram meaning dark on operation dark onthe dark on operating mode is when a through beam sensor produces an output when the light entering the receiver is inter rupted or decreases.

This technology is an ideal alternative to inductive proximity sensors when you require long sensing distances or when the item you want to sense is non metal. The through beam sensor detects objects and materials without contact and indicates their presence by a switching signal range. The emitter and receiver are installed opposite each other to enable the light from the emitter to enter the receiver. If the beam is interrupted the detector triggers an alarm.

Detect the presence or absence of an object moving at high speeds with a light beam. Thru beam sensors in through beam photoelectric sensing or opposed mode the transmitter and emitter are in separate housings. Photoelectric sensors use a beam of light to detect the presence or absence of an object. A photoelectric sensor is an equipment used to discover the distance absence or presence of an object by using a light transmitter often infrared and a photoelectric receiver.

When an object breaks the beam of light between the emitter and receiver the receiver s output changes state. These switches have a longer sensing distance than proximity and ultrasonic switches. Light emitted from the transmitter is aimed directly at the receiver. In convergent beam mode the transmitter lens is focused to an exact point in front of the sensor and the receiver lens is focused to the same point.

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