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The Principle of the Analysis

 

Development of portable gas sensors for the detection of natural and industrial gases such as methane, ammonia, acetylene, acetone, carbon dioxide, oxides of nitrogen and sulfur, and others, is an important task due to the high demand for these sensors in industrial processes , for the protection of the environment, for medical diagnosis, for quality control and other applications.

The strong absorption lines of many important chemical compounds such as CO2, N2O, NO2, NH3, water vapor and others) lie in the Mid-Infrared spectral range (1.5 - 5.0 µm). The characteristic absorption lines of a number of chemical compounds are presented below:


CH4
1.65 µm; 2.30 µm;
3.2 - 3.45 µm;
CO2
2.00 µm; 2.65 µm;
4.2 - 4.3 µm;
H2O
2.6 - 2.85 µm;
1.86 - 1.94 µm;
N2
4.0 - 4.54 µm;
C2H2
2.99 - 3.09 µm;
HOCl
2.6 - 2.9 µm;
HCl
3.33 - 3.7 µm;
NH3
2.27 µm; 2.94 µm;
C2H4
3.1 - 3.4 µm;
HBr
3.7 - 4.0 µm;
OH
2.38 - 2.63 µm;
NO+
4.08 - 4.44 µm;
C2H6
3.3 µm;
HI
2.27 - 2.3 µm;
H2CO
3.38 - 3.7 µm;
HNO3
5.74 - 5.98 µm;
CH3Cl
3.22 - 3.38 µm;
H2S
3.7 - 4.4 µm;
2.5 - 2.8 µm
CO
2.24 µm;
4.4 - 4.8 µm;
NO2
3.4 µm;
OCS
3.45; 4.87 µm;
HCN
2.94 - 3.1 µm;
HO
2.73 - 3.1 µm;2
SO2
4.0 µm;
C6H6
2.44 -2.47 µm
3.17 - 3.33 µm
CHBr3
2.39 µm
3.29 µm
C2H4Cl2
3.23 - 3.51 µm
C2H2Cl2
2.50 - 2.86 µm
C2HCl3
3.22 - 3.25 µm
4.20 - 4.35 µm
H2O2
3.70 - 3.85 µm
4.17 - 4.35 µm
HF
2.33 - 2.78 µm
4.17 - 4.43 µm
C3H8
3.28 - 3.57 µm


The principle of optical IR spectroscopy analysis is based on the ability the substances to absorb infrared radiation selectively. The degree of absorption of IR radiation depends on the concentration of the substance in the test medium.

The figure shows a schematic diagram of an optical IR analyzer consisting of an optically coupled system - the light source and the photodetector.

Schematic diagram of an optical IR analyzer

IBSG Company, Ltd. offers sets of the devices for start analysis of gases and liquids. The sets consist of such IBSG products as IR LEDs and photodiodes, LED drivers and PD amplifiers.

In forming the sets of gases and liquids there is a choice of different modifications of the devices for the specific customer tasks. IBSG company suggests an individual approach to the needs of each customer.

One of the main advantages of the sets is the following: a customer can choose marched system of optoelectronic devices that gives the successful solution of problems in the area of analysis of many chemical compounds.

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