Radiant energy – Photocells; circuits and apparatus – Temperature control of photocell
Patent
1992-06-26
1993-04-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Temperature control of photocell
356435, H01J 724
Patent
active
052025608
ABSTRACT:
The invention is directed to a method of operating a laser diode in a measuring system for spectroscopically measuring the concentration of a gaseous component in a gas sample. This method is improved in that the mode jumps of the laser diode are easily recognized when adjusting the temperature-current operating point of the laser diode. An optical filter is placed in the beam path for adjusting the temperature-current operating point of the laser diode and, by changing the temperature T and the operating current I of the laser diode while simultaneously receiving the output signal supplied by an evaluation unit, the spectral positions of the mode jumps of the laser diode are determined which are included in the absorption lines of the gas sample. Thereafter, the temperature-current operating point is adjusted so that the distance of this operating point to the positions of the mode jumps is not less than a fixed spacing. The invention is also directed to a measuring system for spectroscopically measuring the concentration of a gaseous component in a gas sample.
REFERENCES:
patent: 4849637 (1989-07-01), Cerft et al.
patent: 5159411 (1992-10-01), Hammerich et al.
Diekmann Wilfried
Hagenah Jens-Uwe
Heim Ulrich
Koch Edmund
Maurer Christoph
Dragerwerk Aktiengesellschaft
Le Que T.
Nelms David C.
Ottesen Walter
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