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.
Comments
Post a Comment