M1-Conceptual Q

# M1-Conceptual Q - Name: Sharan Multani Name: Conceptual...

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Name: Sharan Multani Name: Conceptual Questions 1.) An ultrasonic motion sensor sends very short pulses of ultrasound to measure the distance to an object. The sensor cannot send another pulse until the echo from the previous is detected. What is the maximum possible number of individual measurements per second (i.e., the maximum sampling rate) if the distance turns out to be 1.50m? The velocity of ultrasound waves is equal to 344m/s. Show your calculations. Ans1.) Given Date: Velocity: 344m/s Distance: 1.50m Total Distance: 1.5 x 2 = 3m We know that: = = v distancetime dt Therefore, = = t dv 3344 = 0.0087209 seconds Therefore, 1 pulse takes 0.0087209 seconds to propagate and echo back. Pulse Time 1. 0.0087209 seconds X 1 second Therefore, X = 1/0.0087209 seconds X = 114.667 Pulses Therefore the maximum possible number of individual measurements per second (i.e., the maximum sampling rate) is: 114 Pulses/second. 2) Consider two types of measuring devices. The first device has good accuracy, but poor

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## This note was uploaded on 02/14/2011 for the course PHYS 220 taught by Professor Chang during the Fall '09 term at Purdue University.

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M1-Conceptual Q - Name: Sharan Multani Name: Conceptual...

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