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Hydrogen Visualization Using Multi-photon Ionization

Article of Honda R&D Technical Review Vol.21 No.1

Summary

Research has been conducted on a hydrogen visualization technology in order to provide support to the process of research and development on fuel cell vehicles by “making invisible hydrogen visible.” The project eschewed conventional approaches such as indirect measurement of hydrogen using chemical sensors or substitute gases. Instead, it attempted to directly detect hydrogen, and to enable visualization of the state of diffusion of hydrogen in space.
The use of a laser was selected from among a variety of hydrogen detection methods, as its use is considered to be effective in detection at low concentrations. The project focused on a principle by means of which, contrary to conventional fluorescence analysis, fluorescence would occur even if the laser light for excitation did not match the absorption wavelength, and proposed a theory for hydrogen detection.
Results confirmed that the use of the principle of multi-photon ionization enabled direct fluorescence and detection of hydrogen. In addition, results suggested that the technology has the potential to be employed to visualize the changes in the state of diffusion of hydrogen in space as the flow rate changes, enabling analysis and measurement of the state of hydrogen diffusion.

Reference

(1) WO 2006/006628 A1
(2) Seller, R. G., Wang, D.: Assessment of Remote Sensing Technologies for Location of Hydrogen and Helium Leaks, NASA, NAG10-0290 (2000)
(3) LuVan, M., Mainfray, G., Manus, C., Tugov, I.: Multiphoton Ionization of Atomic and Molecular Hydrogen at 0.53μ, Physical Review. A, Vol. 7, Issue 1, p. 91-98 (1973)
(4) Weyl, G. M.: Physics of Laser-Induced Breakdown: An Update, Laser-Induced Plasmas and Applications, Marcel Dekker, p. 1-59 (1989)
(5) Hori, M.: Proof of Principle Experiment, University of Tokyo, 11p. (2003-2005)

Author (organization or company)

Masahiro FUKUTA(Automobile R&D Center)、Ryugo HAYANO(東京大学)、Masaki HORI(東京大学)、Hideo NOBUSUE(Automobile R&D Center)、Takatsugu KOYAMA(Automobile R&D Center)、Jun TANAKA(Automobile R&D Center)

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