Skip to main content Accessibility help
×
Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-21T23:09:34.778Z Has data issue: false hasContentIssue false

13 - QCL-based Gas Sensing with Photoacoustic Spectroscopy

from Part III - Applications

Published online by Cambridge University Press:  25 August 2023

Dan Botez
Affiliation:
University of Wisconsin, Madison
Mikhail A. Belkin
Affiliation:
Technische Universität München
Get access

Summary

Optical gas sensing is a promising alternative to analytical, electrochemical and semiconductor sensors that can offer fast responses times, minimal drift, high gas specificity, with zero cross-response to other gases. Quantum cascade lasers represent the optimal choice as mid-IR sources due to their high output power, compactness, narrow spectral linewidth and broad wavelength tunability. Among optical techniques, Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) has been demonstrated to be a leading-edge technology for real-world gas detection applications, thanks to its modularity, ruggedness, portability and real-time operation capability. QEPAS sensors typically achieve gas detection limits of few parts-per billion level. The basic principles of PAS are provided with a discussion on optoacoustic waves generation and detection. Quartz tuning forks physics is presented in detail, covering aspects like flexural modes resonance, including overtone, quality factor and microresonator tubes configuration. Finally, an overview of QCL-based QEPAS gas sensors for real-world applications, like environmental monitoring, breath sensing, leak detection and multi-gas detection is provided.

Type
Chapter
Information
Publisher: Cambridge University Press
Print publication year: 2023

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Save book to Kindle

To save this book to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Available formats
×

Save book to Dropbox

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.

Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

Available formats
×