NEULOG MOTION LOGGER SENSOR GUIDE
The ultrasonic transducer is based on ceramic crystal, which is cut in a
certain way and is placed between two metal plates.
The crystal is characterized by the piezoelectric effect. Electrical field
changes between the plates create mechanical vibrations in the crystal.
The crystal has a resonance frequency. The mechanical vibrations and
electrical reactions depend on this resonance frequency.
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 it is at 40 KHz.
The acoustic sound can be converted back to electronic pulses by another
ultrasonic transducer or by the 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 measurement a burst of the transducer frequency wave is sent and
the system measures the time between the sending and the receiving.
S = 300 * t
Velocity is calculating by calculating the difference between two successive
distances divided by the time between the samples (according to the
sampling rate).
Acceleration is calculating 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 long distance range with a low power of pulses, which enables to
use it also battery operated.
Maintenance and storage:
Never submerge the NeuLog plastic body in any liquid.
Do not allow liquid into the motion sensor’s body.
After use, gently wipe away any foreign material from the motion
sensor.
Store in a box at room temperature out of direct sunlight.
