Structure of Photoacoustic Spectroscopy (PAS) Cells and Lock-in Amplifiers for PAS Gas Sensors: A Review-PART I
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In this study, photoacoustic spectroscopy (PAS) cells and lock-in amplifiers (LIAs) were surveyed to develop PAS gas sensors. PASgas sensors are based on the physical principle of detection; therefore, the enhancement of their performance is affected by the relatedfundamental properties of target gas concentrations, absorption coefficients, cell setup constants, and power of the infrared light source. Among these, the optical path length, cell volume, and source power are the major factors that enhance the sensitivity of PAS gas sensors. In terms of LIAs, the vector analysis method is much simpler and more cost-effective than the phase-voltage conversion method. Furthermore, active analog–digital LIAs are promising circuitry for PAS gas sensors.
Abstract
In this study, photoacoustic spectroscopy (PAS) cells and lock-in amplifiers (LIAs) were surveyed to develop PAS gas sensors. PASgas sensors are based on the physical principle of detection; therefore, the enhancement of their performance is affected by the relatedfundamental properties of target gas concentrations, absorption coefficients, cell setup constants, and power of the infrared light source. Among these, the optical path length, cell volume, and source power are the major factors that enhance the sensitivity of PAS gas sensors. In terms of LIAs, the vector analysis method is much simpler and more cost-effective than the phase-voltage conversion method. Furthermore, active analog–digital LIAs are promising circuitry for PAS gas sensors.