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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
Sensors 2015, 15(7), 17483-17494;
Received: 3 June 2015 / Revised: 11 July 2015 / Accepted: 15 July 2015 / Published: 20 July 2015
(This article belongs to the Section Physical Sensors)
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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MDPI and ACS Style

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

AMA Style

Porrazzo R, Lydecker L, Gattu S, Bakhru H, Tokranova N, Castracane J. Self-Balancing Position-Sensitive Detector (SBPSD). Sensors. 2015; 15(7):17483-17494.

Chicago/Turabian Style

Porrazzo, Ryan, Leigh Lydecker, Suhasini Gattu, Hassaram Bakhru, Natalya Tokranova, and James Castracane. 2015. "Self-Balancing Position-Sensitive Detector (SBPSD)" Sensors 15, no. 7: 17483-17494.

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