Use of diffuse reflections in tunable diode laser absorption spectroscopy: implications of laser speckle for gas absorption measurements |
| |
Authors: | D. Masiyano J. Hodgkinson R.P. Tatam |
| |
Affiliation: | (1) Engineering Photonics Group, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK |
| |
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. PACS 42.62.Fi; 42.25.Hz; 42.30.Ms |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|