Cavity Ring Down Spectroscopy (CRDS) can be used to measure the concentration of some light-absorbing substance. Typically, this is a gas. The cavity refers to the space between two mirrors facing each other. A brief pulse of laser light is injected into the cavity, and it bounces back and forth between the mirrors.
Noise-Immune Cavity-Enhanced Optical-Heterodyne Molecular Spectroscopy Laser absorption spectrometry Tunable diode laser absorption spectroscopy Molar absorptivity Analyte Absorption spectroscopy Optical cavity Absorbance Beer-Lambert law Absorption (electromagnetic radiation) Exponential function Refractive index Speed of light
