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Self-Balancing Position-Sensitive Detector (SBPSD).

Porrazzo R, Lydecker L, Gattu S, Bakhru H, Tokranova N, Castracane J - Sensors (Basel) (2015)

Bottom Line: 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 Article: PubMed Central - PubMed

Affiliation: Colleges of Nanoscale Science and Engineering, SUNY Polytechnic Institute, 257 Fuller Road, Albany, NY 12222, USA. rporrazzo@albany.edu.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus

I-V curve of n-p-n junction.
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sensors-15-17483-f001: I-V curve of n-p-n junction.

Mentions: The self-balancing position-sensitive detector (SBPSD) consists of two parallel doped lines in a substrate of the opposite doping type with a metal line connecting the contact pads on top of both devices. The line where voltage is applied shall be known as the distributed bias line while the line which the final potential is measured is called the floating line. In our case, two n-type lines were produced in a p-type substrate. Each line is resistive, based on the doping concentration used. The two lines form a linear back-to-back photodiode pair from the n-p-n junction along the device, resulting in the characteristic I-V curve shown in Figure 1. Because the photodiodes are connected back-to-back, one of them is reverse-biased and the other is forward-biased. The reverse bias determines the current flowing inside the device.


Self-Balancing Position-Sensitive Detector (SBPSD).

Porrazzo R, Lydecker L, Gattu S, Bakhru H, Tokranova N, Castracane J - Sensors (Basel) (2015)

I-V curve of n-p-n junction.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541945&req=5

sensors-15-17483-f001: I-V curve of n-p-n junction.
Mentions: The self-balancing position-sensitive detector (SBPSD) consists of two parallel doped lines in a substrate of the opposite doping type with a metal line connecting the contact pads on top of both devices. The line where voltage is applied shall be known as the distributed bias line while the line which the final potential is measured is called the floating line. In our case, two n-type lines were produced in a p-type substrate. Each line is resistive, based on the doping concentration used. The two lines form a linear back-to-back photodiode pair from the n-p-n junction along the device, resulting in the characteristic I-V curve shown in Figure 1. Because the photodiodes are connected back-to-back, one of them is reverse-biased and the other is forward-biased. The reverse bias determines the current flowing inside the device.

Bottom Line: 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 Article: PubMed Central - PubMed

Affiliation: Colleges of Nanoscale Science and Engineering, SUNY Polytechnic Institute, 257 Fuller Road, Albany, NY 12222, USA. rporrazzo@albany.edu.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus