The optical mouse as a twodimensional （将二维。光电鼠标的）.pdf

Sensors and Actuators A 107 (2003) 21–25 The optical mouse as a two-dimensional displacement sensor T.W. Ng∗ Faculty of Engineering, Engineering Block EA-07-32, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore Received 24 July 2002; received in revised form 23 May 2003; accepted 3 June 2003 Abstract Optical sensors are used extensively for displacement measurement. A cost-effective optical displacement sensor will be invaluable in applications where very high resolutions are not required. In this work, the optical mouse has been investigated to determine its suitability for two-dimensional displacement measurement. While the mouse worked only on objects with opaque surfaces, experiments conducted with a commercial unit with 0.0635 mm resolution showed that highly linear (average R2 -value of 0.9914) and low error (mean square error (M.S.E.) value below 0.018 mm2 ) measurements could be attained. On the flipside, the unit could only operate if placed at a distance no greater than 1.25 mm from the object surface. Overall, the optical mouse has been found to be a viable two-dimensional displacement sensor. Its efficacy was demonstrated in measuring the viscoelastic elongation of polyethylene. © 2003 Elsevier B.V. All rights reserved. Keywords: Optical mouse; Displacement sensor; Viscoelasticity; Optical sensor 1. Introduction faces like teletype machines or punch cards for data entry were used. Hence, many years (from mid 1960s to early A wide variety of displacement sensors have been 1970s) elapsed before arrow keys were found on most ter- developed based on