Abstract
A method of integrating sphere effective optical path length (EOPL) evaluation using tunable diode laser absorption spectroscopy for gas detection was demonstrated. Oxygen was used as a sample gas for an 8.38 cm diameter integrating sphere calibration; 393.7 ± 1.3 cm EOPL was obtained from the wavelength modulation spectroscopy with second harmonic calibration by measuring oxygen P11 line at 764 nm, which is in agreement with that of 393 cm by using direct absorption spectroscopy calibration. The EOPL calibration accuracy of this method can reach 0.33 %. It has been justified that the EOPL of an integrating sphere is independent of the incident light intensity.
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This work was supported by the state science and technology support program (grant 2011BAK06B04).
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Gao, Q., Zhang, Y., Yu, J. et al. Integrating sphere effective optical path length calibration by gas absorption spectroscopy. Appl. Phys. B 114, 341–346 (2014). https://doi.org/10.1007/s00340-013-5521-3
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DOI: https://doi.org/10.1007/s00340-013-5521-3