Broadband Phosphor Conversion LED Source for Stroboscopic White Light Interferometry

Ben Wälchli; Ville Heikkinen; Tor Paulin; Ivan Vladislavov Kassamakov; Edward Haeggström

doi:10.1117/12.922114

Broadband Phosphor Conversion LED Source for Stroboscopic White Light Interferometry

Ben Wälchli, Ville Heikkinen, Tor Paulin, Ivan Vladislavov Kassamakov, Edward Haeggström

Research output: Contribution to journal › Conference article › Scientific › peer-review

Abstract

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.

Original language	English
Journal	Proceedings of SPIE, the International Society for Optical Engineering
Volume	8430
Pages (from-to)	843019
ISSN	0277-786X
DOIs	https://doi.org/10.1117/12.922114
Publication status	Published - 2012
MoE publication type	A4 Article in conference proceedings
Event	SPIE Photonics Europe - Brussels, Belgium Duration: 1 Jan 1800 → …

Fields of Science

114 Physical sciences

Access to Document

10.1117/12.922114

Cite this

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title = "Broadband Phosphor Conversion LED Source for Stroboscopic White Light Interferometry",

abstract = "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.",

keywords = "114 Physical sciences",

author = "Ben W{\"a}lchli and Ville Heikkinen and Tor Paulin and Kassamakov, {Ivan Vladislavov} and Edward Haeggstr{\"o}m",

note = " Volume: 8430 Host publication title: Optical Micro- and Nanometrology Proceeding volume: IV; SPIE Photonics Europe ; Conference date: 01-01-1800",

year = "2012",

doi = "10.1117/12.922114",

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TY - JOUR

T1 - Broadband Phosphor Conversion LED Source for Stroboscopic White Light Interferometry

AU - Wälchli, Ben

AU - Heikkinen, Ville

AU - Paulin, Tor

AU - Kassamakov, Ivan Vladislavov

AU - Haeggström, Edward

N1 - Volume: 8430 Host publication title: Optical Micro- and Nanometrology Proceeding volume: IV

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

KW - 114 Physical sciences

U2 - 10.1117/12.922114

DO - 10.1117/12.922114

M3 - Conference article

SN - 0277-786X

VL - 8430

SP - 843019

JO - Proceedings of SPIE, the International Society for Optical Engineering

JF - Proceedings of SPIE, the International Society for Optical Engineering

T2 - SPIE Photonics Europe

Y2 - 1 January 1800

ER -