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A novel wavelength modulation spectroscopy (WMS) laser tuning parameters andconcentration retrieval technique based on the variable-radius-searchartificial bee colony(VRS-ABC) algorithm is proposed. The technique imitatesthe foraging behavior of bees to achieve the retrieval of gas concentration andlaser tuning parameters in a calibration-free WMS system. To address theproblem that the basic artificial bee colony(ABC) algorithm tends to convergeprematurely, we improve the search method of the scout bee. In contrast toprior concentration retrieval methods that utilized the Levenberg-Marquardtalgorithm, the current technique exhibits a reduced dependence on thepre-characterization of laser parameters, leading to heightened precision andreliability in concentration retrieval. We validated the simulation with theVRS-ABC-based technique and the LM-based technique for the target gas C2H2. Thesimulation results show that the VRS-ABC-based technique performs better interms of convergence speed and fitting accuracy, especially in themulti-parameter model without exact characterization.

Laser tuning parameters and concentration retrieval technique for  wavelength modulation spectroscopy based on the variable-radius search  artificial bee colony algorithm