Mid-infrared laser-based detection of benzene

Mohammad Khaled Shakfa; Ali Elkhazraji; Marco Marangoni; Aamir Farooq

doi:10.1117/12.2595041

18 April 2021 Mid-infrared laser-based detection of benzene

Mohammad Khaled Shakfa, Ali Elkhazraji, Marco Marangoni, Aamir Farooq

Proceedings Volume 11772, Optical Sensors 2021; 1177217 (2021) https://doi.org/10.1117/12.2595041
Event: SPIE Optics + Optoelectronics, 2021, Online Only

Abstract

Benzene (C₆H₆) is one of the major public health concerns. It is emitted from various natural and anthropogenic sources, like fires and volcanic emissions, petrol service stations, transportation, and the plastics industry. Here, we present our work on developing a new benzene sensor using a widely tunable difference-frequency-generation (DFG) laser emitting between 11.56 and 15 µm (667–865 cm^–1). The DFG process was realized between an external-cavity quantum-cascade-laser (EC-QCL) and a CO₂ gas laser in a nonlinear, orientation-patterned GaAs crystal. We obtained the absorption cross-sections of the Q-branch of the ν4 vibrational band of benzene by tuning the wavelength of the DFG laser between 14.79 and 14.93 μm (670–676 cm^–1). Benzene sensing measurements were performed near 14.84 μm (673.97 cm^–1) with a direct laser absorption spectroscopy scheme. The benzene concentration was varied between ppb and ppm levels. Even with a relatively short optical path-length of 23 cm, our sensor achieved a benzene detection limit of about 10 ppb.

Conference Presentation

Citation Download Citation

Mohammad Khaled Shakfa, Ali Elkhazraji, Marco Marangoni, and Aamir Farooq "Mid-infrared laser-based detection of benzene", Proc. SPIE 11772, Optical Sensors 2021, 1177217 (18 April 2021); https://doi.org/10.1117/12.2595041

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available