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Nondispersive IR analyzers

Nondispersive IR analyzer prototypes have been fabricated with sensor head which consists of sample and reference PbSe photoresistors (R=300 KOhms, 300 K) as detecting elements and several LED chips all mounted together on the same plate as shown in Fig. The LED emission (4.3 mm for CO2 and 4.6 mm for CO detection) was focused onto the sample photodetector by a concave mirror. The mirror was isolated from a gas by a ZnS window limiting the sample path length to 5 cm. To utilize LED edge emission microreflector has been mounted together with LEDs.

1 - glass sealed IR LEDs; 2 - microreflector with slit for reference beam; 3 - thermosensor ; 4 - TO - 3 header; 5 - TEC; 6 - reference photodetector; 7 - sample photo-detector; 8 - window; 9 - protection window; 10 - spherical mirror; 11 - gas chamber.

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References

1. J. Malinen , T. Hannula , N.V. Zotova, S.A. Karandashov, I.I. Markov, B.A. Matveev, N.M. Stus', G.N. Talalakin "Nondispersive and multichannel analyzers based on mid-IR LEDs and arrays", SPIE vol.2069, Optical Methods for Chemical Process Control, Boston 7-10 September,1993, pp.95-101

2. M. Aidaraliev, N.V. Zotova, S.A. Karandashov, B.A. Matveev, N.M. Stus', and G.N. Talalakin, "Midwave (3-4 µm) InAsSbP/InGaAsSb infrared diode lasers as a source for gas sensors ", Infrared Physics & Technology, 37 (1996) 83-86

3. B.A. Matveev, G.A. Gavrilov, V.V. Evstropov, N.V. Zotova, S.A. Karandashov, G.Yu. Sotnikova , N.M. Stus', G.N. Talalakin and J. Malinen, "Mid-infrared (3-5 µm) LEDs as sources for gas and liquid sensors", Sensors and Actuators B 38-39 (1997) 339-343

4. B. Matveev, M. Aidaraliev, G. Gavrilov, N. Zotova, S. Karandashov, G. Sotnikova, N. Stus', G. Talalakin, N. Il'inskaya, S. Aleksandrov ”Room temperature InAs photodiode-InGaAs LED pairs for methane detection in the mid-IR”, Sensors & Actuators Vol. 51(1998), No. 1-3, pp. 233-237

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