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

 

 

Bullet

 

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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