Tooth caries detection by curve fitting of laser-induced fluorescence emission: A comparative evaluation with reflectance spectroscopy

2005 ◽  
Vol 37 (4) ◽  
pp. 320-328 ◽  
Author(s):  
Narayanan Subhash ◽  
Shiny Sara Thomas ◽  
Rupananda J. Mallia ◽  
Mini Jose
Keyword(s):  
Curve Fitting ◽  
Comparative Evaluation ◽  
Fluorescence Emission ◽  
Reflectance Spectroscopy ◽  
Laser Induced Fluorescence ◽  
Caries Detection

A simple dental caries detection system using full spectrum of laser-induced fluorescence

2015 ◽  
Author(s):  
Renata Maciel Rocha-Cabral ◽  
Fausto Medeiros Mendes ◽  
Edison Puig Maldonado ◽  
Denise Maria Zezell
Keyword(s):  
Dental Caries ◽  
Detection System ◽  
Laser Induced Fluorescence ◽  
Caries Detection ◽  
Full Spectrum

Laser induced fluorescence emission (LIFE)

1971 ◽  
Vol 43 (1) ◽  
pp. 300-304 ◽  
Author(s):  
R. Jankow ◽  
O. Kilham ◽  
W. Renken ◽  
R. Bender
Keyword(s):  
Fluorescence Emission ◽  
Laser Induced Fluorescence

scholarly journals CAFE: a new, improved nonresonant laser-induced fluorescence instrument for airborne in situ measurement of formaldehyde

2019 ◽  
Vol 12 (8) ◽  
pp. 4581-4590 ◽  
Author(s):  
Jason M. St. Clair ◽  
Andrew K. Swanson ◽  
Steven A. Bailey ◽  
Thomas F. Hanisco
Keyword(s):  
Curve Fitting ◽  
High Sensitivity ◽  
Laser Induced Fluorescence ◽  
Time Profile ◽  
In Situ Measurement ◽  
Quality Research ◽  
Research Aircraft ◽  
Operator Interaction ◽  
Nm Range

Abstract. NASA Compact Airborne Formaldehyde Experiment (CAFE) is a nonresonant laser-induced fluorescence instrument for airborne in situ measurement of formaldehyde (HCHO). The instrument is described here with highlighted improvements from the predecessor instrument, COmpact Formaldehyde FluorescencE Experiment (COFFEE). CAFE uses a 480 mW, 80 kHz laser at 355 nm to excite HCHO and detects the resulting fluorescence in the 420–550 nm range. The fluorescence is acquired at 5 ns resolution for 500 ns and the unique time profile of the HCHO fluorescence provides measurement selectivity. CAFE achieves a 1σ precision of 160 pptv (1 s) and 90 pptv (10 s) for [HCHO] = 0 pptv. The accuracy of CAFE, using its curve-fitting data processing, is estimated as ±20 % of [HCHO] + 100 pptv. CAFE has successfully flown on multiple aircraft platforms and is particularly well-suited to high-altitude research aircraft or small air quality research aircraft where high sensitivity is required but operator interaction and instrument payload is limited.

Angular distribution of laser-induced fluorescence emission of active dyes in scattering media

2017 ◽  
Vol 57 (7) ◽  
pp. B32 ◽  
Author(s):  
Ali Bavali ◽  
Parviz Parvin ◽  
Mohammad Tavassoli ◽  
Mohammad Reza Mohebbifar
Keyword(s):  
Angular Distribution ◽  
Fluorescence Emission ◽  
Laser Induced Fluorescence ◽  
Scattering Media

scholarly journals Spectral Behavior of White Pigment Mixtures Using Reflectance, Ultraviolet—Fluorescence Spectroscopy, and Multispectral Imaging

2017 ◽  
Vol 71 (12) ◽  
pp. 2616-2625 ◽  
Author(s):  
Lucilla Pronti ◽  
Anna Candida Felici ◽  
Matthieu Ménager ◽  
Cathy Vieillescazes ◽  
Mario Piacentini
Keyword(s):  
Fluorescence Spectroscopy ◽  
Multispectral Imaging ◽  
Linseed Oil ◽  
Fluorescence Emission ◽  
Reflectance Spectroscopy ◽  
Lead White ◽  
Spectral Behavior ◽  
Uv Fluorescence ◽  
Zinc White ◽  
Titanium White

Reflectance spectroscopy, ultraviolet (UV)—fluorescence spectroscopy, and multispectral imaging have been widely employed for pigment identification on paintings. From ancient times to the present, lead white, zinc white, and titanium white have been the most important white pigments used for paintings and they are used as pigment markers for dating a work of art. The spectral behavior of these pigments is reported in several scientific papers and websites, but those of their mixtures are quite unknown. We present a combined nondestructive approach for identifying mixtures of lead white, zinc white, and titanium white as powder and dispersed in two different binder media (egg yolk and linseed oil) by using reflectance spectroscopy, spectrofluorimetry, multispectral reflectance and UV-fluorescence imaging. We propose a novel approach for mapping the presence of white pigments in paintings by false color images obtained from multispectral reflectance and UV-fluorescence images. We found that the presence of lead white mixed with either zinc white or titanium white is highly detectable. Zinc white mixed with lead white or titanium white can be identified due to its UV-fluorescence emission, whereas titanium white in association with lead white or zinc white is distinguishable by its reflectance spectral features. In most cases, the UV-fluorescence analyses also permit the recognition of the binder media in which the pigments are dispersed.

scholarly journals Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

10.3791/60447 ◽  
2019 ◽  
Author(s):  
Klemens Weisleitner ◽  
Lars Hunger ◽  
Christoph Kohstall ◽  
Albert Frisch ◽  
Michael C. Storrie-Lombardi ◽  
...  
Keyword(s):  
Fluorescence Emission ◽  
Laser Induced Fluorescence ◽  
In Situ Measurements ◽  
Non Invasive

Red/blue spectral shifts of laser-induced fluorescence emission due to different nanoparticle suspensions in various dye solutions

2014 ◽  
Vol 53 (24) ◽  
pp. 5398 ◽  
Author(s):  
A. Bavali ◽  
P. Parvin ◽  
S. Z. Mortazavi ◽  
M. Mohammadian ◽  
M. R. Mousavi Pour
Keyword(s):  
Fluorescence Emission ◽  
Laser Induced Fluorescence ◽  
Spectral Shifts ◽  
Nanoparticle Suspensions ◽  
Dye Solutions
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