ULTRA SONIC PROXIMITY SENSOR

Ultra sonic proximity sensor

· It is used for detect the presence or absence of an object.

· This emits the ultrasonic waves.

Working:

Ø A special type of sonic transducer is used for the ultrasonic proximity sensor, which allows alternate transmission and reception of sound waves.

Ø The ultrasonic transducer emits a number of sonic waves and which are reflected by the object, back to ultrasonic transducer.

When the ultrasonic transducer emits the sound waves it’s automatically switch over the receive mode.

Ø The time elapsed between emitting and receiving is determined the distance between the ultrasonic transducer and near object.

Ø Ultrasonic proximity sensor enables the detection of different objects irrespective of colour and transparency.

Types of ultrasonic sensors:

a. Analog output.

b. Digital output.

c. Retro-reflective type.

d. Thru-Beam type.

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