A new method is reported for determining the concentration of dimethyl methylphosphonate (DMMP) vapor based on the capture of laser speckles from a liquid crystal (LC) sensor. By calculating the change of the correlation coefficients of speckle images, DMMP vapor is selectively detected over a 200 ppb to 5 ppm concentration range, demonstrating the feasibility of the method for determining vapor phase concentrations of Organophosphorus compounds (OPs).
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