Mid-Infrared Laser Absorption Diagnostics for Combustion and Propulsion Applications
Abstract
The objective of the present research program was to develop mid-infrared (mid-IR) laser absorption sensors based on quantum cascade laser (QCL) technology for combustion and propulsion applications. To demonstrate the potential of mid-IR QCL absorption sensors for sensitive and selective measurements of temperature and species concentrations, a carbon monoxide (CO) and thermometry sensor was developed which probes several CO transitions around a wavelength of 4.59 microns. The sensor was demonstrated in a static gas cell, in shockheated gases, and in a flat flame at conditions ranging from room temperature to 3500 K, subatmospheric to five atmospheres of total pressure, and for mixtures containing 10s of ppms to 10% CO. Sensor thermometry and CO concentration determinations are shown to typically deviate by 1-2% with expected values. At room temperature and one atmosphere of pressure, CO detection limits are 30-400 ppb per meter of absorption path length for a detection bandwidth of 1 kHz.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2010
- Accession Number
- ADA534629
Entities
People
- Matthew A. Oehlschlaeger
Organizations
- Rensselaer Polytechnic Institute