| CO | Carbon Monoxide |
| NO | Nitrous Oxide |
| QCL | Quantum Cascade Laser |
| CRDS | Cavity Ring Down Spectroscopy |
| CEAS | Cavity-Enhanced Absorption Spectroscopy |
| ICOS | Integrated Cavity Output Spectroscopy |
| WMS | Wavelength Modulation Spectroscopy |
| dTDLS | Direct Tunable Diode Laser Spectroscopy |
| FWHM | Full Width at Half Maximum |
| FSR | Free Spectral Range |
| FPGA | Field Programmable Gate Array |
| PZT | piezoelectric transducer |
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