By Gabor Patonay
Advances in Near-Infrared Measurements, quantity 1 presents an summary of near-infrared spectroscopy. The e-book is produced from six chapters that take on a number of parts of near-infrared size. bankruptcy 1 discusses distant tracking ideas in near-infrared spectroscopy with an emphasis on fiber optics. bankruptcy 2 covers the functions of fibers utilizing Raman concepts, and bankruptcy three tackles the problems linked to near-infrared facts research. the following chapters current examples of the features of near-infrared spectroscopy from quite a few examine teams. The textual content may be of serious use to researchers who desire to make the most of near-infrared measurements of their paintings.
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Extra info for Advances in Near-Infrared Measurements
D. Anal. , 60, 1873 (1988). 24. ΑρρΙ. Phys. , 4 8 , 7 5 7 (1986). M. L. Myrick I. Introduction Π. Remote Sensing Using Raman Spectroscopy A. Fiber-Optic Raman Measurements B. Fiber-Optic SERS Measurements ΙΠ. Near-IR Raman Techniques A. Near-IR SERS Excitation Profiles B. FT Techniques C. Near-IR Techniques Using Diode Lasers D. Mode Hopping IV. Future Areas of SERS Research V. Conclusion Acknowledgments References Advances in Near-Infrared Measurements Volume 1, pages 25-54. Copyright © 1993 by JAI Press Inc.
Plasma emission from the laser 32 S . M . L. M Y R I C K excitation fiber collection fiber G F F G A Figure 3. O F F dual fiber sensor configurations: (A) 180° OFF- c o n f i g u r a t i o n d u a l - f i b e r o p t r o d e ; (B) d u a l - f i b e r S E R S c o n f i g u r a t i o n u s e d for e l e c t r o d e m e a s u r e m e n t s . G = g r a d e d - i n d e x r o d ( G R I N ) l e n s , F = filter, M = microscope objective. source, fiber background emission (Raman and fluorescence), and lens fluorescence are all eliminated by a narrow-band-pass filter placed immediately after the excitation lens (see Figure 3A).
L. M Y R I C K -i 40x10 W α φ •Ρ G H τ 400 600 800 Raman Figure 13. FT Raman spectrum 1 1000 s h i f t 1 1200 1 1400 1 1600 1 1800 (cm-1) of [ R u ( b p y b ] C l 2 using 1064-nm excitation. beam splitter is used in the interferometer and a near-IR detector, commonly liquid-nitrogen cooled InGaAs, is used to measure the Raman signal. The sample is excited by the 1064-nm laser, and the scattered light is collected by a short focal length lens and collimated. The collimated beam passes through one or more narrow-band rejection filters or longwavelength-pass filters to remove as much of the elastic-scattered (Rayleigh) light as possible, leaving mainly the inelastic-scattered (Raman) light.