Monitoring Human Body Motion Denis Hodgins

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Ilene Manning
6 years ago
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1 Monitoring Human Body Motion Denis Hodgins Lead Partner: ETB Other Partners: Salford IMIT Zarlink Finetech Medical Salisbury Hospital

2 Project Aim To develop a wireless body motion sensing system Applications: To provide the trigger for the Functional Electrical Stimulation System To provide motion data for other human body motion applications To investigate other non medical applications for the motion sensing system

3 Starting point 3-axis accelerometer concept design from ETB 3-axis gyro concepts from INEX and IMIT Extensive knowledge of monitoring motion in the gait lab from Salford

4 Current Status Spec defined for the 3-axis accelerometer and the 3-axis gyro. Proof of concept 3-axis gyro manufactured and tested by IMIT. 3-axis accelerometer system produced by ETB Wired 3-axis accelerometer unit using USB interface for preliminary clinical trials Wireless 3-axis accelerometer unit using Zarlink chip at 433MHz demonstrated

5 Sensor specifications suitable for human body motion applications Parameter Gyro Maximum Value Accelerometer Number of Axes 3 3 Full Scale: 1000º/s 100m/s 2 Bandwidth: 10Hz 10Hz Linearity: 0.1% 0.2% Alignment Error: 0.05º 0.08º Scale Factor Error: 0.1% 0.2% Bias Calibration Error: 0.4º/s 0.1m/s 2 Bias Variation PSD: 10-6 (º/s 2 ) 2 /Hz TBD Noise PSD: 8.3 x 10-6 (º/s) 2 /Hz 1(m/s 2 ) 2 /Hz

6 IMIT 3-axis gyro All 3 axis devices fabricated, on 3 pieces of Silicon, in one plane. Electronics design complete, part analogue and part digital using a DSP. Demonstrator system tested. Results to date indicate that the target specification can be achieved.

7 3-axis gyro unit from IMIT

8 3-axis accelerometer unit development A USB wired version has been developed. It enumerates the 3 axis accelerometer as a USB Communications Device. A simple controller application running on the PC has been written, in order to provide real-time data. The following screenshot shows the main telemetry output of the unit when sampling all 3 axes at 20 Hz. In addition to the X,Y and Z data temperature data is provided, and the data is time-stamped.

9 Bench testing of USB unit

10 Theoretical Modelling of the forearm using acceleration and rotation data Focus of Study - the arm Scope: System Requirements Sensor selection & specification Architecture and approach trade-off Detailed design and performance assessment

11 First trials at Salford

12 Reach and grasp accelerations

13 Discussion of results from Salford Optical system and digitised accelerometer sensor systems track very well. The single 3-axis accelerometer system gives comparable data to single axis device, thus suitable for human body motion application.

14 Wireless 3-axis Accelerometer system

15 Prototype wireless Accelerometer unit

16 Bench testing of wireless unit

17 Wireless accelerometer unit

18 Accelerometer unit used on the Balance Master

19 Plans for the next 2 years Develop the 3-axis gyro, IMIT System integration of the gyro, ETB

20 Plans for the next 2 years Define the sensor set and develop the algorithm to trigger the Upper Arm FES system Develop Inertia Sensing Unit (IMU) system solution, including the development of the High level Estimator to enable accurate human position monitoring in the Gait lab environment Develop mobile system solutions for specific applications e.g Dementia Muscle degradation Epilepsy Obesity activity

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