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Supplying pulses to the crystal of the ultrasonic
transducer in a rate according to its frequency, causes it
to vibrate and to transmit these pulses as an acoustic
sound. This sound cannot be heard because it is above
the hearing frequency range, usually at 40 KHz.
The acoustic sound can be converted back to electronic
pulses by another ultrasonic transducer or by the
transmitter when it stops transmitting. The acoustic
pulses vibrate this transducer and these vibrations are
turned into voltage pulses.
The speed of the ultrasonic wave is 300 m/s because it is
a sound wave. For distance measurements, a burst of
the transducer frequency wave is sent and the system
measures the time between sending and receiving.
S = 300 ∙ t
Velocity is obtained by calculating the difference
between two successive distances divided by the time
between the samples (according to the sampling rate).
Acceleration is obtained by calculating the difference
between two successive velocities divided by the time
between the samples (according to the sampling rate).
The motion sensor uses a very sophisticated method
that enables it to measure a long distance range with a
low power of pulses, which allows its use also battery
operated.
V2018.01
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