Browsing by Author "Hwang, TSD"

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Design and characterization of high-temperature-resolution thermometer
(2006-02-01)
Shie, JS
;
Hwang, TSD
;
光電工程學系
;
Department of Photonics
Thermochromic liquid crystals (TLCs) can serve as a light valve when it is carefully controlled by temperature. With a photodiode used in light transmissive intensity electric output voltage extraction, there is a progressive increase in output voltage from 19.331 to 35.800 degrees C, and the resolution is 0.0001482 degrees C, which decreases progressively to 0.03086 degrees C. If we design a linear integrated circuit with many very small sections for converting nonlinear extraction voltage to its relative temperature automatically, this system can serve as a thermometer. The whole system can be made portable for radiation temperature measurement.
Fabrication of narrow-band self-filtering GaAs photodetector by epitaxy
(2005-11-01)
Shie, JS
;
Hwang, TSD
;
光電工程學系
;
Department of Photonics
A narrow-band self-filtering (NBSF) GaAs photodiode has been fabricated by the LPE technique, where epilayers of high-low-high N doping were grown on a P-type substrate. By proper control of the thickness and doping concentration of each layer, it can be demonstrated that the fabricated NBSF detector has a spectral bandwidth as narrow as 315 angstrom at 880 nm peak wavelength. This means over 98% of the blue-side light is suppressible, indicating that the NBSF photodetector is a useful device for many applications where the suppression of high background light is necessary. (c) 2005 American Institute of Physics.