CLS · RESEARCH AREAS
Connecting molecular spectroscopy with gas-sensing instruments for fuel utilization, emissions monitoring and process operation.
Gas composition and temperature link combustion efficiency, pollutant formation and equipment condition. New fuels such as ammonia bring challenges involving unburned-fuel slip, high water-vapor concentrations and coexisting species. We investigate laser–molecule interactions and develop infrared absorption, dispersion and multiwavelength methods to translate spectra into interpretable gas-state parameters. Alongside spectral fundamentals and signal processing, we examine whether sensors can deliver reliable results under specific gas compositions, temperatures and sampling conditions.
Our published work includes calibration-free heterodyne phase-sensitive dispersion spectroscopy, absorption-spectrum recovery, and compact mid-infrared temperature and carbon-monoxide sensing. For ammonia combustion, we have investigated ammonia-slip detection in wet flue gas and simultaneous NO and ammonia measurements. Our work spans spectral analysis, sensor development and gas testing, with facilities supporting laser absorption and integrated detection systems. Published studies of multiwavelength temperature–humidity sensing and transfer learning also provide a basis for algorithm-assisted measurement.
We study the response of gas absorption and dispersion to concentration, temperature and pressure, developing heterodyne phase-sensitive detection and multispectral analysis. Building on calibration-free dispersion and absorption-recovery methods, we examine how line selection, signal models and background disturbances affect inversion and quantitative reliability.
For unburned ammonia, NO and other combustion products, we investigate the effects of water vapor, collisional broadening and spectral overlap on quantitative detection. Our ammonia-slip and simultaneous two-species studies support improved spectral parameters and interference corrections, including the influence of sample transport and temperature changes on practical response.
We integrate laser sources, multipass absorption cells, photodetectors and signal acquisition into instruments for laboratory and field measurements. Building on compact mid-infrared sensors and multispecies detection, we address optical stability, sample handling, response time and long-term operation through system integration and application testing.
Starting from transfer learning for multiwavelength temperature–humidity sensing, we explore spectral-feature extraction, measurement-model transfer and physically constrained inversion. By relating operating conditions to spectral response, we combine data methods with molecular models to develop approaches to multispecies identification, drift compensation and anomaly detection.
Building on combustion diagnostics and flue-gas sensing, future research will expand multispecies measurements for energy equipment, industrial processes and environmental monitoring, pursuing compact, stable and deployable instruments. Algorithms will be introduced around practical needs such as adaptation to operating conditions, quality assessment and anomaly identification, in conjunction with molecular-spectroscopy and instrument-response models. We will also explore links to equipment-state assessment and process control, connecting instrument development, experimental validation and application requirements.
Introduces calibration-free heterodyne phase-sensitive dispersion spectroscopy and absorption-spectrum recovery.
Develops a compact mid-infrared sensor for temperature and carbon monoxide measurements.
Investigates simultaneous NO and ammonia measurements in ammonia-combustion flue gas with very high water-vapor content.
Develops laser absorption sensing of ammonia slip in wet flue gas, connecting spectroscopy with practical fuel monitoring.
Applies transfer learning to multiwavelength temperature–humidity sensing, providing a basis for data-assisted measurement.
