Laser dispersion spectroscopy for non-intrusive combustion diagnostics

US10718706B2 · kind B2 · utility

Assignee

• The Chinese University of Hong Kong · CN

Inventors

• Wei Ren · Tangxia, CN
• Liuhao Ma · Hong Kong, CN
• Zhen Wang · Shanghai, CN
• Kin Pang Cheong · Hong Kong, CN

Key dates

• Filing date: May 4, 2018
• Grant date: Jul 21, 2020
• Expiry date: Dec 15, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/1293
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Systems and methods of laser dispersion spectroscopy for in situ, quantitative and non-intrusive measurements of combustion parameters, such as temperature and gas concentrations are provided. The system includes a laser source configured to sweep across the spectral features of molecules, an RF generator configured to modulate a laser to generate a three-tone laser beam, a photodetector configured to detect the transmitted three-tone laser beam to generate a heterodyne beat note signal, and a lock-in amplifier configured to further process the beat note signal in order to measure a phase of the heterodyne beat note signal.