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Vol. 100, Issue 1, January 2009, pp.125-136





Increasing of Excursion Range of Absolute Optical Sensors Intended for Positioners


1Igor Friedland, 2Ioseph Gurwich, 3Amit Brandes

1Dep. Control system, Elbit Systems (ELOP) P.O.Box 1165, Rehovot 76111, Israel

Tel.: 972-8-9386937, fax: 972-8-9386850

2 Dep. Remote sensing, Elbit Systems (ELOP) P.O.Box 1165, Rehovot 76111, Israel

Tel.: 972-8-9386852, fax: 972-8-9307460

3 Dep. Control system, Elbit Systems (ELOP) P.O.Box 1165, Rehovot 76111, Israel

Tel.: 972-8-9307714, fax: 972-8-9386850

E-mail: IgorFr@elop.co.il, ioseph.gurwich@elbitsystems.com, amit.brandes@elbitsystems.com



Received: 17 December 2008   /Accepted: 19 January 2009   /Published: 26 January 2009


Abstract: In the present paper we consider an optical linear sensor with a new structure, which allows for increasing its excursion range. Such a sensor is applied in positioners for precise measuring of linear displacement. The developed analytical model of such a device provides a possibility of preliminary theoretical analysis and developing an algorithm, correcting the appeared significant nonlinearity of sensor volt-displacement characteristic and thus reducing the positioner instability. Consequently, the suggested sensor can be successfully embedded in a closed-loop control system of a linear positioner with increased linear displacement. In the paper an example of a positioner with this sensor is described. A comparison of the computed and experimentally measured results is also given.


Keywords: Absolute position sensor, Sensor scale factor, LED, Photodiode, Positioner


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