13 February 2016 Detection of hydrogen peroxide based on long-path absorption spectroscopy using a CW EC-QCL
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Abstract
A sensor system based on a CW EC-QCL (mode-hop-free range 1225-1285 cm-1) coupled with long-path absorption spectroscopy was developed for the monitoring of gas-phase hydrogen peroxide (H2O2) using an interference-free absorption line located at 1234.055 cm-1. Wavelength modulation spectroscopy (WMS) with second harmonic detection was implemented for data processing. Optimum levels of pressure and modulation amplitude of the sensor system led to a minimum detection limit (MDL) of 25 ppb using an integration time of 280 sec. The selected absorption line for H2O2, which exhibits no interference from H2O, makes this sensor system suitable for sensitive and selective monitoring of H2O2 levels in decontamination and sterilization processes based on Vapor Phase Hydrogen Peroxide (VPHP) units, in which a mixture of H2O and H2O2 is generated. Furthermore, continuous realtime monitoring of H2O2 concentrations in industrial facilities employing this species can be achieved with this sensing system in order to evaluate average permissible exposure levels (PELs) and potential exceedances of guidelines established by the US Occupational Safety and Health Administration for H2O2.
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N. P. Sanchez, Y. Yu, L. Dong, R. Griffin, F. K. Tittel, "Detection of hydrogen peroxide based on long-path absorption spectroscopy using a CW EC-QCL", Proc. SPIE 9755, Quantum Sensing and Nano Electronics and Photonics XIII, 975508 (13 February 2016); doi: 10.1117/12.2212964; https://doi.org/10.1117/12.2212964
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