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Title:
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The optical mouse sensor as an incremental rotary encoder
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Author:
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Tresánchez Ribes, Marcel; Pallejà Cabrè, Tomàs; Teixidó Cairol, Mercè; Palacín Roca, Jordi
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Notes:
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In this paper, a new application and capabilities of the sensor of the optical mouse are presented. An
inexpensive incremental rotary encoder is built based on a mechanical assembly where the sensor is at a
fixed distance from a rotary white surface onto which a reference black line is drawn. The optical mouse
sensor measures changes in position by optically acquiring sequential surface images and mathematically
determining the direction and magnitude of movement. The optical sensor uses the information of the
images acquired and an attached light source in a closed control loop to keep an average illumination
level in the images. In this paper, the registers involved in this control loop are used to detect high
contrast marks without any dedicated image-processing procedure. The detection of this reference mark
in a rotary white surface allows the correction of long term cumulative errors originated in displacement
measurements performed by the optical sensor and enables the use of the rotary encoder in precision
measurements close to 1900 counts per revolution.
With the support of the Government of Catalonia (Comissionat per a Universitats i Recerca, Departament d’Innovació, Universitats i Empresa) and the European Social Fund. |
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Subject(s):
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-Optical mouse
-Mouse sensor
-Rotary encoder
-Displacement sensor |
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Rights:
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(c) Elsevier, 2009
info:eu-repo/semantics/restrictedAccess |
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Document type:
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article
publishedVersion |
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Published by:
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Elsevier
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