FT-IR Step-Scan Photoacoustic Phase Analysis and Depth Profiling of Calcified Tissue

Rapid-scan- and step-scan-based Fourier transform infrared photoacoustic depth profiling results of an extracted but intact human tooth are compared. The effects of various data processing methods are examined. Analysis of the phase dispersion of the photothermal signal along with spectral linearization is used to access the extent of photoacoustic saturation in the photoacoustic spectra. Phase-modulated/phase-resolved depth profiling methods are less prone to photoacoustic saturation and provide superior localization of the surface and subsurface absorbers distributed in the tooth enamel. Mid-infrared depth profiling studies of calcified tissues can aid in the understanding of degenerative bone diseases, bone growth, and modeling, as well as tissue mineralization.

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Depth-Profiling of Composition and Texture in Human Tooth Enamel–A Functionally Graded Material

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 - Ceramic Engineering and Science Proceedings ◽

10.1002/9780470291191.ch77 ◽

2008 ◽

pp. 509-514

Author(s):

I. M. Low

Keyword(s):

Functionally Graded Material ◽

Tooth Enamel ◽

Depth Profiling ◽

Functionally Graded ◽

Human Tooth ◽

Human Tooth Enamel ◽

Graded Material

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Quantitative Depth Profiling of Layered Samples Using Phase-Modulation FT-IR Photoacoustic Spectroscopy

Applied Spectroscopy ◽

10.1366/0003702963905015 ◽

1996 ◽

Vol 50 (10) ◽

pp. 1258-1263 ◽

Cited By ~ 38

Author(s):

Roger W. Jones ◽

John F. McClelland

Keyword(s):

Layer Thickness ◽

Phase Modulation ◽

Surface Film ◽

Depth Profiling ◽

Single Pair ◽

Rapid Scan ◽

Thin Polymer ◽

Ft Ir ◽

Phase Data ◽

Ft Ir Spectroscopy

In phase-modulation FT-IR spectroscopy, all wavelengths in a spectrum are modulated at the same frequency and in phase. This factor makes the use of photoacoustic phase data for depth profiling samples much easier in phase modulation than in rapid scan. A method to quantitatively measure layer thickness by using the phase of a substrate spectrum peak is demonstrated with a series of samples consisting of thin polymer Alms on substrates. Additions to the basic method are demonstrated that extend its application to cases where the substrate peak is overlapped by a spectrum peak of the surface film. A linear relationship between phase angle and layer thickness extending to thicknesses greater than twice the thermal diffusion length is demonstrated. Representations of phase modulation data as a family of angle-specific spectra, as magnitude vs. phase curves, and as a power spectrum and phase spectrum pair, each of which is useful for different aspects of depth profiling, are discussed. Calculating these representations from a single pair of orthogonal interferograms is described.

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Contamination from Possible Solar Light Exposures in ESR Dosimetry Using Human Tooth Enamel.

Journal of Radiation Research ◽

10.1269/jrr.39.185 ◽

1998 ◽

Vol 39 (3) ◽

pp. 185-191 ◽

Cited By ~ 14

Author(s):

NORI NAKAMURA ◽

JANINE F. KATANIC ◽

CHYUZO MIYAZAWA

Keyword(s):

Tooth Enamel ◽

Solar Light ◽

Human Tooth ◽

Human Tooth Enamel

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Hexahedrally Based Crystals in Human Tooth Enamel

Caries Research ◽

10.1159/000261432 ◽

1992 ◽

Vol 26 (2) ◽

pp. 69-76 ◽

Cited By ~ 6

Author(s):

T. Kodaka ◽

K. Debari ◽

M. Abe

Keyword(s):

Tooth Enamel ◽

Human Tooth ◽

Human Tooth Enamel

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Investigation on the microtribological behaviour of human tooth enamel by nanoscratch

Wear ◽

10.1016/j.wear.2010.11.020 ◽

2011 ◽

Vol 271 (9-10) ◽

pp. 2290-2296 ◽

Cited By ~ 20

Author(s):

S.Y. Zheng ◽

J. Zheng ◽

S.S. Gao ◽

B.J. Yu ◽

H.Y. Yu ◽

...

Keyword(s):

Tooth Enamel ◽

Human Tooth ◽

Human Tooth Enamel

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Human tooth enamel as a record of the comparative lead exposure of prehistoric and modern people

The Science of The Total Environment ◽

10.1016/s0048-9697(00)00604-5 ◽

2000 ◽

Vol 263 (1-3) ◽

pp. 1-10 ◽

Cited By ~ 47

Author(s):

P Budd ◽

J Montgomery ◽

J Evans ◽

B Barreiro

Keyword(s):

Lead Exposure ◽

Tooth Enamel ◽

Human Tooth ◽

Human Tooth Enamel

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Photoacoustic FT-IR Spectroscopy of Natural Copper Patina

Applied Spectroscopy ◽

10.1366/0003702953965461 ◽

1995 ◽

Vol 49 (10) ◽

pp. 1516-1524 ◽

Cited By ~ 10

Author(s):

Alex O. Salnick ◽

Werner Faubel

Keyword(s):

Depth Distribution ◽

Depth Profiling ◽

Beam Deflection ◽

City Hall ◽

Spectral Bands ◽

Special Sample Preparation ◽

Ft Ir ◽

Infrared Photoacoustic Spectroscopy ◽

Ft Ir Spectroscopy

Fourier transform infrared photoacoustic spectroscopy (FT-IR/PAS) has proved to be a useful tool for nondestructive testing of copper corrosion layer (patina) formed in the atmosphere. The samples cut from a piece of the roof of the Stockholm City Hall were examined without any additional pretreatment. The components of the patina—brochantite Cu4(OH)6SO4, antlerite Cu3(OH)4SO4, and basic cupric carbonate Cu2CO3(OH)6 · H2O—as well as some other minerals were identified. The photothermal beam deflection (PBD) method was used for independent photoacoustic characterization of the samples. The depth profiling capability of FT-IR/PAS was used to determine the degree of photoacoustic saturation of the spectral bands and to evaluate the depth distribution of the main patina components. The technique thus compares favorably with more common approaches of patina examination which are more expensive and require special sample preparation.

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