Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2018 Jul 28;124(8):161. doi: 10.1007/s00340-018-7030-x

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

PMC Copyright notice

Fig. 1 — a Schematic drawing of a typical mid-infrared TDLAS setup employing an ICL, a circular, low-volume MPC, and WMS (with permission from [39]). LDC: laser diode controller, LiA: lock-in amplifier, FGen: function generator, PT: pressure transducer, PD: photodetector. b Real-time, exhalation profiles (breath cycles) of CO and CO₂ measured with an EC-QCL, and a CO₂ profile recorded with NDIR spectroscopy (capnography) (with permission from [36]). The three exhalation phases (dead space/airways, transition region, and alveolar region) are indicated