Multiplexed Diode-Laser Gas Sensor System for In Situ Multispecies Emissions Measurements

EPA Grant Number: R823933
Title: Multiplexed Diode-Laser Gas Sensor System for In Situ Multispecies Emissions Measurements
Investigators: Hanson, Ronald K. , Baer, D. S.
Institution: Stanford University
EPA Project Officer: Hahn, Intaek
Project Period: October 1, 1995 through September 30, 1996 (Extended to December 31, 1997)
Project Amount: $194,870
RFA: Exploratory Research - Engineering (1995) Recipients Lists
Research Category: Engineering and Environmental Chemistry , Land and Waste Management


The purpose of this project is to develop a multiplexed diode-laser gas sensor system capable of sensitive path-integrated emissions measurements for use in compliance monitoring and process control. The sensor system combines fiber-optic and diode-laser technology, absorption spectroscopy, and second-harmonic generation techniques to probe electronic and vibration-rotation transitions of selected species and thus enable in situ measurements of multiple species, simultaneously, at several locations. These advanced optical sensors are species-specific, insensitive to interferences, and offer prospects for remote, non-intrusive, continuous measurements of species concentration and temperature in high-temperature environments including waste incinerators, natural gas combustors, heaters, and internal combustion engines. The target species to be monitored with the first generation of the proposed sensor system include: NO2, a critical pollutant; CO, a combustion product; and CO2, a combustion product and greenhouse gas. Extension of the technique to monitor other species (e.g., NO, N2O, NH3, CH4, HF, H2O, O2 and various hydrocarbons) in combustion effluents is possible.

Publications and Presentations:

Publications have been submitted on this project: View all 6 publications for this project

Journal Articles:

Journal Articles have been submitted on this project: View all 1 journal articles for this project

Supplemental Keywords:

air, air pollution, emissions measurements, compliance monitoring, sensor system, process control., RFA, Scientific Discipline, Toxics, Air, Waste, Chemistry, HAPS, mobile sources, Environmental Monitoring, tropospheric ozone, Incineration/Combustion, Environmental Engineering, Environmental Law, hydrocarbon, compliance monitoring, VOCs, emissions measurement, air pollution, chemical contaminants, process control, laser gas sensor system, waste incineration, hydrocarbons, complex combustion effluents, incineration, measurement methods , combustion contaminants

Progress and Final Reports:

  • 1996
  • 1997
  • Final Report