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Force Plate Actimeter
The document describes a force plate actimeter system consisting of four force sensors, a force plate, pre-amplifiers, and a data acquisition system connected to application software. The system is used to measure and analyze movement and force data. Key features of the system include high-resolution force and position data collection, calculations of traveled distance, rotation, and other movement metrics, and force analysis including changes, variance, and frequency domain measurements. The accompanying software allows setup, real-time display, data file output, and analysis including replays, movement trajectories, frame summaries, and graphical reports.
Force Plate Actimeter
- 1. Force Plate Actimeter HongpingDai July 18, 2005
- 2. Schematic Diagram ofA Force-Plate Actimeter 1. Four Force Sensors 2. Force Plate 3. Four Pre-Amplifier 4. Data Acquisition System 5. Application Software
- 3. Data Acquisition FourIndependent A/D Converters of 16-Bit Raw Data as 16-bit WORD Calculation of Force: Calculation of Position 4321 4321 ffff ffff Wx HALF +++ +−− = 4321 4321 ffff ffff Wy HALF +++ −−+ = iiii bDaf +=
- 4. Movement Analysis • TraveledDistance • Triangle Area of three adjacent movement positions-Drunken Man Walking • Rotation of three adjacent movement as rotation • Bouts of Low Mobility • Spatial Statistics
- 5. Force Analysis • ForceChange • Force Variance • Frequency Domain Analysis Tremor Studies f ff N i i 2 1 )(∑= − =σ
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- 7. FPARun for Measurement •System Setup Calibration of Force Sensors Balancing Force Plate Offsets of Force Plate • Run Setup • Run a Measurement • Data File
- 8. System Setup 1-Calibration ofForce Sensors
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- 10. System Setup 3-Offsets ofForce Plate
- 11. System Setup Weighing aSubject
- 12. System Setup Weighing aSubject
- 13. System Setup Final Points •Force Sensor Calibration data is stored in the registry as binary data • Calibration in registry is used as the default every time FPARun is started • Update in Calibration is updated in the registry • No need to calibrate the force sensor every time FPARun is started
- 14. Ready for RunSetup
- 15. Setup of aRun
- 16. Setup of aRun
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- 18. Real-Time Display ofA Measurement
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- 21. Raw Data File(.FPA) • Header of FPA data as text: "BAS-FPA-Data File-1". • Measurement setup information Raw data file name, set before starting the measurement, as text Project information as text Operator name as text Animal Information – Animal ID as text – Animal Sex as integer (4 bytes)---0 for female and 1 for male – Animal DOB as double (8 bytes) • Pre-run note as text • Measurement start time as double (8 bytes) • Runtime note (refer to §5.6 Write Runtime Notes As Part of Raw Data File) • Data acquisition rate: number of points per second as WORD • Number of data points per frame, as WORD • Number of Frames, as WORD • Raw Data of Forces
- 22. Self-Guided FPARun • Sequenceof Operations in FPARun is self-guided with enable/disable of menu items/toolbar buttons
- 23. FPAAnalysis • Open FPAData File • Presentation of Report Front Page and Various Calculated Results • Print, Print Preview and Copy of Report • Replay Measurement Processes
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- 26. Review of MovementTrajectories
- 27. Print Preview ofMovement Trajectories
- 28. Copy One Frameof Movement Data to Excel
- 29. Movement Trajectories ofWhole Session
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- 31. Review of FrameData
- 32. Print Preview ofFrame Data
- 33. Tabular Summaries ofData of All Frames
- 34. Print Preview ofTabular Summaries
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- 38. Print Preview ofGraphic Frame Summaries
- 39. Traveled Distance inWhole Session
- 40. Force Changes inWhole Session
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- 43. What to donext? • Add Sensor Calibration Date to CFPACalib • Averaging Positions for Movement Calculations • CRC32 for the FPA Report File • More Force Analysis To Implement