You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
5 May 2012Broadband phosphor conversion LED source for stroboscopic white light interferometry
We report on building a broadband LED light source for stroboscopic white light interferometry. We chose phosphor
types, mass ratios, and encapsulant, to tailor the necessary emission spectrum. Based on known emission spectra, we
mixed combinations of blue, cyan, yellow, and red down-conversion phosphors. The phosphor composite was excited
with a modified UV LED (365 nm). UV provides primary excitation of blue phosphor BAM (BaMgAl10O17:Eu). The
emission (≈ 450 nm) of the blue phosphor provides secondary excitation of longer wavelength phosphors (YAG (yttrium
aluminum garnite), strontium-barium silicate, and sulfoselenide). The effective spectrum's FWHM was 244±1.5 nm;
spectral drop was 14%. The pulse width was 2.2 μs when the LED was driven with 14 A. We used the source for static
MEMS measurements in a SWLI system. The obtained SWLI interferogram features 883 nm FWHM and low side lobes.
The alert did not successfully save. Please try again later.
B. Wälchli, V. Heikkinen, T. Paulin, I. Kassamakov, E. Hæggström, "Broadband phosphor conversion LED source for stroboscopic white light interferometry," Proc. SPIE 8430, Optical Micro- and Nanometrology IV, 843019 (5 May 2012); https://doi.org/10.1117/12.922114