Quantitative measurement of body motion using Schottky barrier silicon photodiode

James H.K. Yoo Department of Physical Medicine and Rehabilitation, The University of Texas Health Science Center, San Antonio, Texas, USA; Bioengineering Program, Departments of Industrial Engineering and Electrical Engineering, College of Engineering, Texas A&M University, College Station, Texas, USA

Inhak H. Suh Department of Physical Medicine and Rehabilitation, The University of Texas Health Science Center, San Antonio, Texas, USA; Bioengineering Program, Departments of Industrial Engineering and Electrical Engineering, College of Engineering, Texas A&M University, College Station, Texas, USA

Steven Wallace Department of Physical Medicine and Rehabilitation, The University of Texas Health Science Center, San Antonio, Texas, USA; Bioengineering Program, Departments of Industrial Engineering and Electrical Engineering, College of Engineering, Texas A&M University, College Station, Texas, USA

James W. Hankla Department of Physical Medicine and Rehabilitation, The University of Texas Health Science Center, San Antonio, Texas, USA; Bioengineering Program, Departments of Industrial Engineering and Electrical Engineering, College of Engineering, Texas A&M University, College Station, Texas, USA

Keith A. Wauters Department of Physical Medicine and Rehabilitation, The University of Texas Health Science Center, San Antonio, Texas, USA; Bioengineering Program, Departments of Industrial Engineering and Electrical Engineering, College of Engineering, Texas A&M University, College Station, Texas, USA

Abstract

A new motion detection system has been developed using a laser beam and a Schottky barrier silicon photodiode. The system broadens the scope of gravitational center stabilography by facilitating the quantitative assessment of tremors of body appendages such as the hands and even the head. The system also eliminates cumbersome platforms and wire attachments previously used in gravitational center stabilography. The subject is asked to aim the beam at the photodiode. A quantitative off-center variation parameter, ARDS (Average Radial Distance Squared multiplied by time), was utlized in units of cm² sec. A preliminary evaluation of the system shows that it is suitable for rapidly screening large numbers of subjects for localised neuromuscular control.

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Quantitative measurement of body motion using Schottky barrier silicon photodiode

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Quantitative measurement of body motion using Schottky barrier silicon photodiode

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