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Laser spectroscopy is a valuable tool for sensing and chemical analysis. Developments in lasers, detectors and mathematical analytical tools have led to improvements in the sensitivity and selectivity of spectroscopic techniques and extended their fields of application. Laser Spectroscopy for Sensing examines these advances and how laser spectroscopy can be used in a diverse range of industrial, medical, and environmental applications.
Part one reviews basic concepts of atomic and molecular processes and presents the fundamentals of laser technology for controlling the spectral and temporal aspects of laser excitation. In addition, it explains the selectivity, sensitivity, and stability of the measurements, the construction of databases, and the automation of data analysis by machine learning. Part two explores laser spectroscopy techniques, including cavity-based absorption spectroscopy and the use of photo-acoustic spectroscopy to acquire absorption spectra of gases and condensed media. These chapters discuss imaging methods using laser-induced fluorescence and phosphorescence spectroscopies before focusing on light detection and ranging, photothermal spectroscopy and terahertz spectroscopy. Part three covers a variety of applications of these techniques, particularly the detection of chemical, biological, and explosive threats, as well as their use in medicine and forensic science. Finally, the book examines spectroscopic analysis of industrial materials and their applications in nuclear research and industry.
The text provides readers with a broad overview of the techniques and applications of laser spectroscopy for sensing. It is of great interest to laser scientists and engineers, as well as professionals using lasers for medical applications, environmental applications, military applications, and material processing.
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Woodhead Publishing Series in Electronic and Optical Materials
Introduction
Dedication
Part I: Fundamentals of laser spectroscopy for sensing
Abstract:
1.1 Introduction
1.2 Radiative processes and spectral broadening mechanisms
1.3 Atomic spectroscopy
1.4 Molecular spectroscopy
1.5 Conclusion
1.6 Acknowledgments
1.7 References
Abstract:
2.1 Introduction
2.2 Laser basics
2.3 Emission linewidth and emission cross-section
2.4 Cavity conditions
2.5 Spectral and temporal control
2.6 References
Abstract:
3.1 Introduction
3.2 Selectivity requirements for sensing applications
3.3 Approaches to improve sensitivity
3.4 System stability and signal averaging
3.5 Conclusion
3.6 References
Abstract:
4.1 Introduction
4.2 Definition of a database
4.3 Atomic spectroscopy databases on the Internet
4.4 Building your own database
4.5 Putting your database online
4.6 Conclusion
4.7 Disclaimer
4.8 References
Abstract:
5.1 Introduction
5.2 Preliminary notes: terminology and use of data
5.3 Feature extraction and data pre-processing
5.4 Data analysis and algorithm development: extracting information from data
5.5 Performance evaluation
5.6 Conclusion
5.7 Future trends
5.8 Sources of further information and advice
5.9 Acknowledgments
5.10 References
Part II: Laser spectroscopy techniques
Abstract:
6.1 Introduction
6.2 Enhancement of sensitivity in absorption spectroscopy
6.3 Gas-phase cavity-ringdown spectroscopy (CRDS) and related methods
6.4 Other forms of gas-phase CRDS and related cavity-based techniques
6.5 Scope of cavity-based spectroscopy: progress and prospects
6.6 Conclusion
6.7 References
Abstract:
7.1 Introduction
7.2 Fundamental sensitivity limitations
7 3 General considerations for photo-acoustic spectroscopy (PAS) based sensing
7.4 Practical design of photo-acoustic detectors: gas phase
7.5 Impact of energy transfer processes
7.6 Conclusion
7.8 Appendix: abbreviations
Abstract:
8.1 Introduction
8.2 Lasers and coherence
8.3 Spectral resolution
8.4 Temporal resolution
8.5 Laser-induced fluorescence (LIF) imaging and spatial resolution
8.6 LIF sensitivity
8.7 Conclusion and future trends
8.8 Sources of further information and advice
8.9 references
Abstract:
9.1 Introduction
9.2 Thermometry methods using thermographic phosphors (TP)
9.3 Applications of TP
9.4 Conclusion and future trends
9.5 Acknowledgements
9.6 References
Abstract:
10.1 Introduction
10.2 Atmospheric spectroscopy and attenuation properties
10.3 Lidar equation and remote sensing sensitivity
10.4 Different lidar types
10.5 Lidar remote sensing examples
10.6 Conclusion and future trends
10.7 References
Abstract:
11.1 Introduction
11.2 Principles of photothermal spectroscopy
11.3 Methods of photothermal spectroscopy
11.4 Flow photothermal detectors
11.5 Photothermal spectroscopy in applied chemistry
11.6 Photothermal spectroscopy of solids and interfaces
11.7 Biophotothermal spectroscopy
11.8 Conclusion and future trends
11.9 References
Abstract:
12.1 Introduction: the historical 'terahertz gap'
12.2 Terahertz (THz) systems based on ultrafast lasers
12.3 Terahertz sources and detectors
12.4 Applications of terahertz spectroscopy
12.5 Other terahertz applications
12.6 Conclusion and sources of further information
12.7 Acknowledgments
12.8 References
Part III: Applications of laser spectroscopy and sensing
Abstract:
13.1 Introduction
13.2 Laser-induced breakdown spectroscopy (LIBS)
13.3 Fluorescence
13.4 Raman
13.5 Conclusion
13.6 References
Abstract:
14.1 Introduction to spectroscopy
14.2 Energy levels in atoms, molecules and solid-state materials
14.3 Radiation processes
14.4 Absorption and emission spectra
14.5 Interplay between absorption and scattering in turbid media
14.6 Absorption and scattering spectroscopy of tissue
14.7 Fluorescence spectroscopy
14.8 Raman spectroscopy
14.9 Gas in scattering media absorption spectroscopy (GASMAS)
14.10 Conclusion and future trends
14.11 Acknowledgments
12 References
Applications of laser spectroscopy in forensic science
Abstract:
15.1 Introduction
15.2 Research applications of laser techniques: laser-induced fluorescence (LIF)
15.3 Research applications of laser techniques: laser-induced breakdown spectroscopy (LIBS)
15.4 Research applications of laser techniques: Raman
15.5 Conclusion
15.6 References