force plate actimeter
TRANSCRIPT
Force Plate Actimeter
Hongping Dai
July 18, 2005
Schematic Diagram of A Force-Plate Actimeter
1. Four Force Sensors2. Force Plate3. Four Pre-Amplifier4. Data Acquisition System5. Application Software
Data Acquisition Four Independent A/D Converters of 16-Bit Raw Data as 16-bit WORD Calculation of Force:
Calculation of Position
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Movement Analysis
• Traveled Distance • Triangle Area of three adjacent movement
positions-Drunken Man Walking• Rotation of three adjacent movement as
rotation• Bouts of Low Mobility• Spatial Statistics
Force Analysis
• Force Change• Force Variance
• Frequency Domain Analysis Tremor Studies
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FPARun Application Software
FPARun for Measurement• System Setup
Calibration of Force SensorsBalancing Force PlateOffsets of Force Plate
• Run Setup • Run a Measurement• Data File
System Setup1-Calibration of Force Sensors
System Setup2-Balancing Force Plate
System Setup3-Offsets of Force Plate
System SetupWeighing a Subject
System SetupWeighing a Subject
System SetupFinal 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
Ready for Run Setup
Setup of a Run
Setup of a Run
Ready TO Run
Real-Time Display of A Measurement
Runtime Note
Animal Behavior Marker
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
Self-Guided FPARun
• Sequence of Operations in FPARun is self-guided with enable/disable of menu items/toolbar buttons
FPAAnalysis
• Open FPA Data File• Presentation of Report Front Page and
Various Calculated Results• Print, Print Preview and Copy of Report• Replay Measurement Processes
FPAAnalysisReport Front Page
FPAAnalysisSystem Setup Information
Review of Movement Trajectories
Print Preview of Movement Trajectories
Copy One Frame of Movement Data to Excel
Movement Trajectories of Whole Session
3D-Movement Localization
Review of Frame Data
Print Preview of Frame Data
Tabular Summaries of Data of All Frames
Print Preview of Tabular Summaries
Copy Frame Summaries
Copy to Excel
Graphical Frame Summaries
Print Preview of Graphic Frame Summaries
Traveled Distance in Whole Session
Force Changes in Whole Session
Stereotype Scores
Replay of Measurement
What to do next?
• Add Sensor Calibration Date to CFPACalib • Averaging Positions for Movement Calculations • CRC32 for the FPA Report File • More Force Analysis To Implement