Industrial Applications of Laser Remote Sensing

by

Tetsuo Fukuchi, Tatsuo Shiina

DOI: 10.2174/97816080534071120101
eISBN: 978-1-60805-340-7, 2012
ISBN: 978-1-60805-641-5



Indexed in: Scopus, EBSCO.

This e-book is an essential review of land-based laser sensing methods, such as differential absorption, Raman scattering, laser-indu...[view complete introduction]
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Gas Sensing Using Raman Scattering

- Pp. 60-88 (29)

Hideki Ninomiya

Abstract

The Raman shift is a characteristic property of a molecule, and the intensity of Raman scattering is proportional to the density of the molecule. Therefore, gas sensing using Raman scattering can detect and identify gases. The method is especially useful for detection of hydrogen gas, because the hydrogen molecule does not have absorption bands from the near ultraviolet to near infrared that can be used for optical detection using absorption. On the other hand, the hydrogen molecule exhibits a strong Raman effect, so Raman scattering is a suitable method for hydrogen gas detection. In this chapter, the fundamentals of Raman scattering, detection of hydrogen gas by Raman scattering, development of lidar systems for detection, imaging, and concentration measurement of hydrogen gas, are presented. The concentration of hydrogen gas leaked into the open air can be remotely measured by simultaneous measurement of the Raman scattering signals from the hydrogen gas and atmospheric nitrogen. Hydrogen gas leak detection using Coherent Anti-Stokes Raman Scattering (CARS) is also presented.

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