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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 37 mm SBSPD with 50 μm and 75 μm spacing between doped lines. Inset from −0.3 to 0.3 shows the resistance changes when varying the distance between doped lines.
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sensors-15-17483-f008: I-V curve of 37 mm SBSPD with 50 μm and 75 μm spacing between doped lines. Inset from −0.3 to 0.3 shows the resistance changes when varying the distance between doped lines.

Mentions: Investigations were performed to determine how the distance between doped lines would affect the slope of the I-V curve. 37 mm devices were fabricated with a distance of 50 µm and 75 µm between the doped lines. Various distances between the doped lines will result in different values in resistance between lines and changes in the slope of the transition part between saturation regions of I-V curves as can be seen in the inset in Figure 8.


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 37 mm SBSPD with 50 μm and 75 μm spacing between doped lines. Inset from −0.3 to 0.3 shows the resistance changes when varying the distance between doped lines.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17483-f008: I-V curve of 37 mm SBSPD with 50 μm and 75 μm spacing between doped lines. Inset from −0.3 to 0.3 shows the resistance changes when varying the distance between doped lines.
Mentions: Investigations were performed to determine how the distance between doped lines would affect the slope of the I-V curve. 37 mm devices were fabricated with a distance of 50 µm and 75 µm between the doped lines. Various distances between the doped lines will result in different values in resistance between lines and changes in the slope of the transition part between saturation regions of I-V curves as can be seen in the inset in Figure 8.

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