Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
| Autor: | Zhongshan Li, Rasmus L. Pedersen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Immunology and Microbiology Optical Phenomena Spectrophotometry Infrared Infrared business.industry General Chemical Engineering General Neuroscience Detector Signal Noise (electronics) General Biochemistry Genetics and Molecular Biology Photon upconversion Optical phenomena Optics Gases business Spectroscopy Mixing (physics) |
| Zdroj: | Journal of visualized experiments : JoVE. (145) |
| ISSN: | 1940-087X |
| Popis: | We present a protocol for performing gas spectroscopy using infrared degenerated four-wave mixing (IR-DFWM), for the quantitative detection of gas species in the ppm-to-single-percent range. The main purpose of the method is the spatially resolved detection of low-concentration species, which have no transitions in the visible or near-IR spectral range that could be used for detection. IR-DFWM is a nonintrusive method, which is a great advantage in combustion research, as inserting a probe into a flame can change it drastically. The IR-DFWM is combined with upconversion detection. This detection scheme uses sum-frequency generation to move the IR-DFWM signal from the mid-IR to the near-IR region, to take advantage of the superior noise characteristics of silicon-based detectors. This process also rejects most of the thermal background radiation. The focus of the protocol presented here is on the proper alignment of the IR-DFWM optics and on how to align an intracavity upconversion detection system. |
| Databáze: | OpenAIRE |
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