Sensor Shorts version 1

In this version of the sensor shorts we integrate five acceleration sensors (MPU-9250 IMUs, InvenSense Inc.) in a stretchable legging. The sensors are much smaller and lighter than the Shimmer IMU sensors used for the version 0 and are therefore expected to be more comfortable and result in less spurious signals due to the inertia of the sensors itself.

Design and the application of the wave pattern of the lead wires on the textile

The encapsulated sensor

Top view of a MPU- 9250 IMU

Electronics placed in a waist pack

Results and conclusions

In order to test the accuracy of the new sensor shorts the recorded movements were compared to an Optoelectronic Motion Analysis System (Vicon Nexus), see Fig.4. From this we conclude that our measurement system was able to measure the local knee and hip angle movements as accurate as the Vicon system, which is currently considered as the golden standard for local motion measurements.

Kaspar Jansen

Graduate student

Suman Vinasithamby (ME)

Supervision

Prof. F.C.T. van der Helm (ME)
Dr. F. Bregman (ME)
Prof. K.M.B. Jansen (IO)
Ir. Annemarijn Steijlen (IO-EWI)
Edwin Goedhart (KNVB)

Knee- and hip joint angles (in degrees) obtained from the Smart Sensor Shorts in dashed grey and from the Optoelectronic Motion Analysis System (VICON Nexus) in solid black during a 10m sprinting, kicking and jumping movement of one subject. In the plot, sprint 1 stands for jog, sprint 2 for a maximal sprint, kick 1 for a pass, kick 2 for a shot, jump 1 for a jump from standstill and jump 2 for a jump with run-up.