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Use of diffuse reflections in tunable diode laser absorption spectroscopy: implications of laser speckle for gas absorption measurements

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Abstract

The use of diffusely scattering materials as a means of eliminating interference fringes has been investigated. Their use introduces laser speckle that can contribute a random, rather than periodic, uncertainty to gas measurements. We have established a method for quantifying the uncertainty due to speckle and investigated ways of reducing it. We characterised the speckle at 823 nm allowing the use of low-cost CCD cameras. We have tested the principle of the model by making gas absorption measurements on the 1650-nm methane absorption line using wavelength-modulation spectroscopy, for which preliminary results are presented.

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Authors and Affiliations

  1. Engineering Photonics Group, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK

    D. Masiyano, J. Hodgkinson & R.P. Tatam

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  1. D. Masiyano
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  2. J. Hodgkinson
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  3. R.P. Tatam
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Correspondence to J. Hodgkinson.

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PACS

42.62.Fi; 42.25.Hz; 42.30.Ms

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Masiyano, D., Hodgkinson, J. & Tatam, R. Use of diffuse reflections in tunable diode laser absorption spectroscopy: implications of laser speckle for gas absorption measurements. Appl. Phys. B 90, 279–288 (2008). https://doi.org/10.1007/s00340-007-2896-z

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  • DOI: https://doi.org/10.1007/s00340-007-2896-z

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