Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1997-02-03
1998-08-04
Pham, Hoa Q.
Optics: measuring and testing
By polarized light examination
With light attenuation
33 3R, 33 6, 33515, 73172, 600592, 364558, G02B 2608
Patent
active
057902569
ABSTRACT:
An apparatus and methods for analyzing feet which utilize matrixes of pressures sensors and optical sensors connected to a controller and a monitor. An apparatus of the invention includes a housing which houses a controller and a monitor and defines left and right foot wells for receiving left and right feet, respectively. The floor of each foot well includes a pressure pad assembly which includes a matrix of pressure sensor contacts covered by a variably resistive pressure pad to form pressure sensor matrixes. A digital signal processor normalizes and smoothes the pressure data for display on the monitor. Infrared LED's and phototransistors are located around the perimeter of each foot well and are utilized to measure the length, width, and heights of a foot. A microprocessor addresses each LED and phototransistor separately. The controller reads data created by the DSP and IR microprocessor, calculates additional data, and displays the resulting data on the monitor. According to one method, the pressure sensors and optical sensors are utilized to determine, among others, foot length, foot width, shoe size, foot volume, foot shape, force distribution, pronation, arch type, and recommended last type. In other methods, the DSP and IR microprocessors provide data which enable the controller to perform calculations and comparisons to display orthotic prescriptions or insole selection information, as well as medical information related to center of pressure and postural sway analysis which is useful in diagnosing and treating a large variety of medical problems.
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Pham Hoa Q.
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