| Light Emitting Diodes for CO2 sensors Carbon Dioxide has very strong absorption band in the range 4200-4320 nm. Other not so strong absorption bands that can be used are placed around 2700 nm and 2000 nm. | ||
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| For main absorption band we recommend using of our model LED43 as a light source in the measuring channel and LED36 as a reference light source. We have not appropriate photodiode for this range but room temperature PbSe photoresistor PR43 can be used as a detector. | ||
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| Second absorption band near 2700 nm is not convinient for using because there is placed stron absorption of the water. But for some aplication using of the third band around 2000 nm can be preferable. This band is much weaker then main one but optical power of LEDs and detectivity of photodiodes for 2 mm spectral range are much better in comparison with 4 mm spectral range. In this case LED20 and LED17 can be used in measuring and reference channel and PD24 as a detector.
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 | All Light Emitting Diodes and Photodiodes can be mounted in standard package TO-18, in TO-18 with parabolic reflector (PR) or in 9 mm package TO-5 with microcooler (TEC) and termistor inside. For saving you time at the first stage of development of new gas sensor we suggest you to use our LED Drivers and Preamplifiers. | |