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Sensors 2015, 15(7), 17483-17494;

Self-Balancing Position-Sensitive Detector (SBPSD)

Colleges of Nanoscale Science and Engineering, SUNY Polytechnic Institute, 257 Fuller Road, Albany, NY 12222, USA
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 3 June 2015 / Revised: 11 July 2015 / Accepted: 15 July 2015 / Published: 20 July 2015
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [1628 KB, uploaded 20 July 2015]   |  


Optical position-sensitive detectors (PSDs) are a non-contact method of tracking the location of a light spot. Silicon-based versions of such sensors are fabricated with standard CMOS technology, are inexpensive and provide a real-time, analog signal output corresponding to the position of the light spot. An innovative type of optical position sensor was developed using two back-to-back connected photodiodes. These so called self-balancing position-sensitive detectors (SBPSDs) eliminate the need for external readout circuitry entirely. Fabricated prototype devices demonstrate linear, symmetric coordinate characteristics and a spatial resolution of 200 μm for a 74 mm device. PSDs are commercially available only up to a length of 37 mm. Prototype devices were fabricated with various lengths up to 100 mm and can be scaled down to any size below that. View Full-Text
Keywords: PSD; back-to-back connected photodiode; linear position sensor; optical position sensor PSD; back-to-back connected photodiode; linear position sensor; optical position sensor

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Porrazzo, R.; Lydecker, L.; Gattu, S.; Bakhru, H.; Tokranova, N.; Castracane, J. Self-Balancing Position-Sensitive Detector (SBPSD). Sensors 2015, 15, 17483-17494.

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