The data

Every event.
Described in full.

ACT Head Impact Tracker head sensor Pro captures a rich set of measurements, far beyond the usual maximum g-force and single angular acceleration or speed. All of the data collected can be exported to the most common spreadsheets from the Browser dashboard using the Export tool.

Measured per event

Far more than
a single number.

Pucks laid out on the impact test surface
Maximum linear acceleration (g)
Maximum initial linear acceleration (g)
Impact g-load
Initial impact g-load
Maximum angular acceleration (rad/s²)
Maximum initial angular acceleration (rad/s²)
Accumulation of angular acceleration
Initial accumulation of angular acceleration
Maximum angular velocity (rad/s)
Maximum initial angular velocity (rad/s)
Accumulation of angular velocity
Initial accumulation of angular velocity
Time of the event
Frequency of the events
Proximity of the events
Number of the events
Event history
Coming soon: Impact Feature Space (IFS)

Patent pending

What is Impact
Feature Space?

Impact Feature Space (IFS), a patent-pending capability coming to the ACT head sensor Pro, is a multi-dimensional representation of head-movement waveforms. Each event is described across multiple mechanical domains, offering a complementary view of head-motion analysis.

IFS provides access to mechanically meaningful differences that are directly relevant to injury mechanisms – so a combination of forces can be assessed more thoroughly and accurately than with a single parameter.

IFS

Impact Feature Space

A multi-dimensional signature of each impact, patent pending.

Independently validated

3.6%

Linear acceleration you can trust

ACT head sensor accuracy has been independently validated by the LUT University (Lappeenranta) Machine Dynamics Lab against precision reference accelerometers, with a maximum deviation of just 3.6%. G-force is not only one of the parameters measured – it also acts as the trigger for event measurement.

The device

ACT Head Impact Tracker head sensor Pro –
the specifications.

Name
ACT head sensor Pro
Casing materials
Silicone, EPDM foam
Color
Dark grey
Dimensions
46,70 × 34,40 × 7,60 mm
Net weight (no battery)
< 20 g
Operating temperature
At least -10 °C
Water / dust protection
Not for water use
Communications
Bluetooth® 5.0 LE
Battery life
60-80h on-time (CR2032 not included)
Smallest event shown
10g (adjustable on request)
Accelerometer scale
200 (100 / 400 on request)
Max g-force (theoretical)
346
Max rad/s (theoretical)
60 (35 per axis)
Certifications
CE, FCC, IC, Bluetooth®
Patent
EP 3958699
Validated by
LUT University Machine Dynamics Lab
Data export
Yes – common spreadsheets
Sports supported
Virtually all dry-land sports

Research & collaborations

Used by universities,
trusted by researchers.

ACT Head Impact Tracker has been and is currently used by several universities and in multiple research projects across several countries. Studies and papers are shared on our channels as they become openly available.

Brains on Ice – University of HelsinkiVisit → SUCCESS – University of Helsinki & University of JyväskyläVisit → ACT white paperDownload → Patent EP 3958699 – European Patent RegisterView → Football Docs Innovation World Cup – Certificate of AppreciationView →

Safety and Warning

Wear the sensor only in a location where impacts or pressure do not occur; if you feel pressure or discomfort, change the location. Runs on a CR2032 coin-cell battery. The sensor is not a household product certified for the USA or Canada. Keep out of reach of children and animals. ACT Head Impact Tracker is a measurement device. It is not a medical device and does not diagnose, prevent, or treat concussion or any other brain injury. In a suspected head injury, remove the athlete from play and seek assessment by a licensed medical professional.