By R. Grisar, H. Preier, G. Schmidtke, G. Restelli
By now it's been approximately two decades because the pioneering reports on the MIT-Lincoln Laboratories, Lexington, united states, tested the original functions of lead salt tunable diode lasers (TDL) for infrared absorption spectroscopy. The development within the use of TDL instrumentation for a wide selection of medical functions was once defined by way of lots of papers when you consider that, despite the fact that, relatively few conferences have been in particular dedicated to this topic. In 1980 the convention on "High solution Infrared Spectroscopy functions and advancements" on the nationwide Bureau of criteria in Gaithersburg, united states, reviewed the cutting-edge of tunable diode lasers including Fourier remodel Spectroscopy and different laser spectroscopic options. 3 years later in 1983 the SPIE convention in San Diego, united states, devoted one assembly to "Tunable Diode Laser improvement and Spectroscopy" functions. It seemed acceptable after an extra period of 3 years to prepare one other assembly approximately this quick advancing box. In November of 1986 a world Symposium on "Monitoring of Gaseous pollution via Tunable Diode Lasers" was once prepared through and held on the Fraunhofer-Insti tut fuer Physikalische Messtechnik in Freiburg, FRG. the most emphasis of this convention was once wear the purposes of TDL options to the answer of difficulties of environmental relevance : The dimension of atmospheric hint gases and the tracking of exhaust gases from vehicle and gear plant stack emitters. The nation of diode laser improvement and alertness of TDL tools to clinical molecular spectroscopy weren't at once topics of the meeting.
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Additional resources for Monitoring of Gaseous Pollutants by Tunable Diode Lasers: Proceedings of the International Symposium held in Freiburg, F.R.G., 13–14 November 1986
F. (1981). The temporal and spatial distribution of tropospheric nitrous oxide, J. Geophys. Res. 86, C 8, 7185. 736cm- 1 17 m bar 296K 96 m Modu l. amp!. 707cm- 1 T DL CURRE NT - WAVENUMBER Fig. 9 a NH . 2 ppbv as derived from spectrum (A) and the calibratLon procedure described. CO 2 mixing ratio (340 ppmv) and other parameters as for the experimental spectrum. > Z v J~ v o ::£ a: '" :t: o 13 mbar 296K ~Om V o Modul. 9o<",o, N,O : 300ppbv If) H,~ : Z hl lppbv WAVENUMBER Fig. 2 - Computer generated second harmonic spectrum.
The system has been developed under contract of the Gennan Federal Environmental lIgency, with the objective to detect mean concentrations of this pollutant on a routine basis /1/. The system can be used for day arrl night operatirn. i::M detection limits caribined with high response time can be aChieved. After rrodifications the system can also be used for the detection of other pollutants with sufficient strong absorption lines like ID, ID2' NH3 etc. \S)" using a lead salt laser diode as light source /2/.
The list oontains many hydrocarbons like ethylene (C2HIt) which is one of the major oonstituents of car exhaust gases, but also species involved in the photochemical smog formation like PAN. 12C1602 _ LaSer 12C160 - Laser Nitric oxide Nitrogen dioxide Peroxiacetylnitrate (PAN) Formaldehyde Ethylene Propylene 1,3-Butadiene Benzene Ammonia Hydrogen nitrate ID ID2 CH30)3ID2 H200 C2HIt C3H6 Clt H6 C6 H6 NH3 HID3 -46- Ethylene Propylene 1,3-Butadiene Benzene Toluene Trichloroethylene Perchloroethylene Ozone Ammonia Phosgene C2HIt C3 H6 Clt H6 C6H6 C7Ha C2HCl 3 C2Cl it 03 NH3 Cl2CO 2.