Introduction
Movement analysis can be used for a variety of examinations in practice and in the laboratory, e.g. for recording postures & movements as part of a load/risk assessment of a workplace or for process analysis of activities. Currently, the sensor-based Captiv system of the company TEA is used for motion detection at the IAD (teaergo.com).
In addition to the collection of movement data, the Captiv system also enables the time-synchronous collection of EMG, ECG, acceleration and force data using appropriate supplementary sensors. Thus, comprehensive investigations of activities can be carried out and, in particular, physical stress and physiological strain can be recorded, analyzed and evaluated.
Technology
The Captiv measuring system consists of a total of 15 handy motion sensors (60mm x 35mm x 15mm). Each sensor is equipped with a 3-axis acceleration sensor, gyroscope and magnetometer. With a frequency between 32 and 128 Hz (adjustable) these values are recorded, processed internally and transmitted wirelessly. The sensors are fixed to the corresponding body parts by means of belts and straps.
The IAD has two different receivers available to record the measurement data in the field. On the one hand, the so-called T-Rec (stationary receiver) can be used to receive the movement data of up to 16 sensors in real time and to output and process them directly on a laptop. The reception range is about 15m. On the other hand, up to 32 sensors can be recorded simultaneously with the T-Log (personal receiver). In this case the receiver is fixed to the test person together with the sensors. The evaluation of the data takes place downstream of the acquisition. Due to the personal receiver there are no spatial limits, so that recordings can even be made across company premises.
Application
Processing and evaluation of the collected transaction data can be implemented with the Captiv software. Here, the data from the individual sensors are combined, processed as desired, e.g. by converting motion sensor data into body angle, and finally evaluated. This makes it possible to identify, for example, critical and highly stressful postures. In addition, the software has the possibility to import video files. In combination with the integrated coding function, individual action characteristics and sub-activities can be identified synchronously with the measurement and evaluated specifically with regard to posture or the recorded movement sequence.
The Captiv system has already been used in several IAD projects:
- SFB 805: Investigation of the human influence on the uncertainty of use
- Mittelstand 4.0: Analysis of changes in psychophysical stress as a result of the use of assistance systems
- Major airport: measurement of movement data during aircraft handling
