This is a
measurement system which uses ultrasonic transmitter and receiver units mounted
at a small distance between them and phillips P89C51RD2 microcontroller based
system. This system has been made for the use of robotic sewer inspection
system. This system is mounted in the front portion on an automated robotic
vehicle. Then the system will compute the distance or location of the obstacle
or blockage to the control station above the ground.
An interrupt
signal(INT1) initiate the system. When the interrupt INT1is received, MCU start
the timer and simultaneously generates the controlled 40KHz ultrasound pulse in
the air in the direction of the object. These ultrasonic pulses are reflected
from the object and travels back in different directions. When these waves
arrived at the receiver, the signals received by the receiver is amplified and
processed by receiver module. Receiver module generates an interrupt signal
INT2 ; at the instant the first pulse of burst is recovered. INT2 stops the
timer 1 and MCU calculates the time between generation and reception of the
wave.The measured distance is calculated on the basis of travel time according
to a formula.
This system
can be easily implemented in other devices and systems requiring the
measurement of distance of an object or an obstacle from stationary or moving
observation point where the ultrasonic sensor will be located.
Bandara W.M.N.N
AS/12/13/010
2950
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