Gas phase photoacoustic spectroscopy in the long-wave IR using quartz tuning forks and amplitude modulated quantum cascade lasers

Michael D. Wojcik; Mark C. Phillips; Bret D. Cannon

doi:10.1117/12.687044

13 October 2006 Gas phase photoacoustic spectroscopy in the long-wave IR using quartz tuning forks and amplitude modulated quantum cascade lasers

Michael D. Wojcik, Mark C. Phillips, Bret D. Cannon

Author Affiliations +

Proceedings Volume 6398, Optically Based Biological and Chemical Detection for Defence III; 63980S (2006) https://doi.org/10.1117/12.687044
Event: Optics/Photonics in Security and Defence, 2006, Stockholm, Sweden

Abstract

We demonstrate the performance of a novel long-wave infrared photoacoustic laser absorbance spectrometer for gas-phase species using an amplitude modulated (AM) quantum cascade (QC) laser and a quartz tuning fork microphone. Photoacoustic signal was generated by focusing the output of a Fabry-Perot QC laser operating at 8.41 μm between the legs of a quartz tuning fork which served as a transducer for the transient acoustic pressure wave. The QC laser was modulated at the resonant frequency of the tuning fork (32.8 kHz). This sensor was calibrated using the infrared absorber Freon-134a by performing a simultaneous absorption measurement using a 35 cm absorption cell. The NEAS of this instrument was determined to be (see equation in manuscript), and the fundamental sensitivity of this technique is limited by the noise floor of the tuning fork itself.

Citation Download Citation

Michael D. Wojcik, Mark C. Phillips, and Bret D. Cannon "Gas phase photoacoustic spectroscopy in the long-wave IR using quartz tuning forks and amplitude modulated quantum cascade lasers", Proc. SPIE 6398, Optically Based Biological and Chemical Detection for Defence III, 63980S (13 October 2006); https://doi.org/10.1117/12.687044

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