ZeroPoint Technology designs, builds and tests custom manufactured accelerometers.
These sensors are wireless, with all
the data being logged to the device in real-time. The ultra-compact design and large memory capability allows these sensors to
unobtrusively monitor athletic activity in the field or laboratory for several hours at a time. A simple connection allows for rapid
download of the data to a personal computer.
ZeroPoint Technology will work closely with you to decide on the specifications of your design such as the accelerations ranges,
number of acceleration axes, the sampling frequency, the memory storage requirements, and the length of recording time.
Technical Specifications
Measure accelerations on one, two or three axes.
Standard sampling rates: 1kHz and 2kHz per axis (faster rates are possible).
Acceleration ranges: from +/-2g to +/-250g.
Duration of data recording: up to 8 hours. (longer durations are possible).
Light weight: up to 55grams; smaller units weight only 30grams.
Size available: 65x38x13mm and 32x38x13mm.
Splash resistant.
Rechargeable batteries.
Low battery indicator.
Capable to be synchronized with other instrumentation.
USB download to PC.
The figures on the left shows the 3DPebble; a 3D accelerometer node that can operate for 8 hours continuously.
The 3DPebble is 65x38x13mm in size and weighs 55 grams. The relative size of the 3DPebble is shown by the
quarter, and the credit card behind the unit. The u3DPebble, shown on the right,
is the smaller and lighter version (32x38x13mm, 30 grams).
It can record for 2 hours continuously (either at 1 or 2kHz per channel);
three to four 2 hour recording sessions are possible with one
battery charge.
Our accelerometers have been attached to runners running various distances, from short distances (less than 30 minutes),
to marathons (over 4 hours).
Running on the Track
The figure on the left shows the vertical (Av) and horizontal (Ah) accelerations, measured in g,
recorded on the track using the 3DPebble.
Detroit Marathon
The vertical (Av) and horizontal (Ah) accelerations measured using the 3DPebble on a runner, during the Detroit Marathon, are shown above.
The duration of recording is just over 4 hours, and the accelerations were sampled at 1000hz on each of the three axes.
Notice where the runner stopped.
ZeroPoint's accelerometers have also been attached to subject's knees for jumping research.
The resulting tibia axial accelerations (TAA) have been compared to the ground reaction force (GRF), as measured by the convention force plate.
Vertical Jumping
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