The working principle of infrared concentration analysis is based on the fact that different gases selectively absorb infrared rays of a certain wavelength. The absorption of infrared rays by gas molecules is due to the fact that the molecules can absorb the infrared spectrum radiant energy when the specific frequencies of the molecules themselves are consistent. The infrared gas source light source produced in China uses nickel-chromium wire and supplies a constant current to raise the temperature to 700-900. C, emitting infrared light in the wavelength of 2 ~ 7μm, symmetrical diatomic gas and monoatomic gas (such as O2, H2, Ar) do not absorb infrared radiant energy in the range of 2 ~ 7μm; and CO2, CO, NH3, H2O, etc. There is a strong absorption band in this wavelength range (such as CO24.25μm, CO4.25μm, NH3, 6.15μm, H2O, 2.67μm). The CO2 infrared concentration analyzer works by using a strong absorption band in the CO22~7μm band.
When the infrared light passes through the CO2 gas, the outgoing light intensity and the incident light intensity obey the Lambert-Bell law, and the formula is:
It can be seen from equation (1) that K is constant for a certain component to be tested, and when I0 and L are constant, I is a single-valued function of C. Thus, the intensity of the light after passing through the gaseous medium is detected to detect the concentration. From the formula, I decreases exponentially with the increase of the concentration of the component, which is a nonlinear relationship, which brings certain errors to the scale of the meter. There are two methods for the infrared gas analyzer to perform nonlinear processing. One is to select the length L of the measuring chamber according to the range of the gas concentration to be measured. When the C·L value is small, the transmitted light intensity and the concentration C are between Enter the approximate linear region of Figure 1 to achieve linearity. Another method uses a linear correction network in the circuit portion of the analyzer to linearize the output and concentration.
When the infrared light passes through the CO2 gas, the outgoing light intensity and the incident light intensity obey the Lambert-Bell law, and the formula is:
It can be seen from equation (1) that K is constant for a certain component to be tested, and when I0 and L are constant, I is a single-valued function of C. Thus, the intensity of the light after passing through the gaseous medium is detected to detect the concentration. From the formula, I decreases exponentially with the increase of the concentration of the component, which is a nonlinear relationship, which brings certain errors to the scale of the meter. There are two methods for the infrared gas analyzer to perform nonlinear processing. One is to select the length L of the measuring chamber according to the range of the gas concentration to be measured. When the C·L value is small, the transmitted light intensity and the concentration C are between Enter the approximate linear region of Figure 1 to achieve linearity. Another method uses a linear correction network in the circuit portion of the analyzer to linearize the output and concentration.
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