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Recent advance in tunable diode-laser spectroscopy with background RAM nulling for industrial applications

Ruxton, Keith C. and Chakraborty, Arup Lal and McGettrick, A.J. and Duffin, K. and Johnstone, W. and Stewart, G. (2009) Recent advance in tunable diode-laser spectroscopy with background RAM nulling for industrial applications. Proceedings of SPIE: The International Society for Optical Engineering, 7503 (750313).

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Abstract

A limiting factor of tuneable diode laser spectroscopy (TDLS) with wavelength modulation spectroscopy (WMS) is the presence of background residual amplitude modulation (RAM) on the recovered 1st harmonic signal. The presence of this background term is due to direct modulation of the source laser power. This work presents a novel method to optically remove the unwanted background, with the major benefit being that measurement sensitivity can be increased. The recently developed phasor decomposition method1 (PDM), is a near IR (NIR) TDLS analysis technique that is used with the addition of the new RAM nulling method to recover gas absorption line-shapes. The PDM is a calibration free approach, which recovers the gas absorption line-shape and the isolated 1st derivative of the line-shape from the 1st harmonic signal. The work presented illustrates and validates the new RAM nulling procedure with measurements examining the 1650.96nm absorption line of methane (CH4) with comparisons to theory.

Item type: Article
ID code: 27792
Keywords: fiber optics, tunable spectroscopy, diode-laser spectroscopy, RAM nulling, Electrical engineering. Electronics Nuclear engineering, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Electrical and Electronic Engineering, Applied Mathematics, Computer Science Applications
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Related URLs:
    Depositing user: Miss Rachel Foster
    Date Deposited: 16 May 2011 15:28
    Last modified: 08 Jul 2014 05:02
    URI: http://strathprints.strath.ac.uk/id/eprint/27792

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