Coda AMPLIFIER 15.0 Guía de usuario descargar pdf (Pagina 11)

Charnwood Dynamics Ltd. Coda cx1 User Guide

CX1 USER GUIDE - COMPLETE.doc 26/04/04

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Resolution

The angular resolution of each camera is about 0.03 mrad (0.002 degrees); this results in

a lateral position resolution of about 0.05mm at 3 metres distance (horizontally and

vertically), and a distance resolution of about 0.3mm.

Measurement Volume

For standard markers, the measurement volume extends from a distance of 2.0m to about

6.0m in front of the measurement unit, at a width and height approximately 1.6 times the

distance.

Coordinate system

The long axis of the measurement unit defines the direction of the X-axis (normally

horizontal and parallel to the walk-way). The perpendicular away from the unit defines the

positive Y-axis (normally horizontal, across the walk-way). The other perpendicular

(vertical) defines the Z-axis (positive up).

The positive X-axis is to the right as seen from Coda.

The origin of the coordinate system is offset by the user to any point in the field of view.

PC interface

The Coda measurement unit is connected to the host computer via a serial port interface

(RS-232 or RS-422).

Multiple Codas

The measurement volume may be extended by adding additional measurement units. A

second unit will also allow bilateral data acquisition. When multiple measurement units

are used, all markers are tracked simultaneously by each unit - the maximum number of

markers remains at 56 (at 100Hz). Marker position data from each unit is combined

automatically.

Software

The Codamotion Analysis software provides the user-interface to the Coda hardware for

real-time data display and data acquisition (marker position, analogue Force and EMG),

and also the data processing functions for analysing the data.

The software is designed for general-purpose motion analysis, but special functions for

Clinical Gait analysis are included.

The software allows the user to define (Joint) angles from the relative positions of (any)

markers, and can combine force data to calculate joint moments and powers. Angles may

also be defined relative to the Lab coordinate frame.

Marker velocities and accelerations, and distances between markers are calculated

automatically, and are available for plotting.

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Coda AMPLIFIER 15.0 Guía de usuario Pagina 11