Research on Online Corrective Method of Gas Analyzer Based on TDLAS Technology
The gas analyzer based on tunable diode laser absorption spectroscopy(TDLAS)technology can cause drift of the temperature control of the laser caused by changes in the ambient temperature or long-term aging of the electronic devices,which can lead to the harmonic signal of the measured gas to be offset.By designing the spectroscopic reference optical circuit,reference receiving circuit and software correction process,the gas online monitoring and real-time online correction are realized by using the reference harmonic signal as the reference signal for correction judgment.The test adopts a signal processing unit to compare the center point of the reference harmonic signal with the preset center point,and judges whether to carry out the corrective action according to the corrective parameters such as the corrective threshold value and corrective range,etc.The test results show that the use of the reference signal to judge correction is more suitable for the application of low concentration gas detection than the measurement signal,and can effectively avoid the non-correction and mis-correction.This method can solve the problem of harmonic signal offset caused by the change of complex environmental factors,and improve the reliability and stability of the application of the gas analyzer based on TDLAS technology.
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