The detection of underwater microorganisms is an important means to detect water quality. The determination of water quality can be completed by detecting the species, quantity and density of microorganisms in water. In order to detect underwater microorganisms, a method of measuring underwater microorganisms by digital holography is presented. Paramecia were measured and their morphology was obtained by digital holographic imaging, so as to detect and identify underwater microorganisms.
On the basis of the conventional Jamin interferometer,the improved measuring method is proposed that using a polarization type reentrant Jamin interferometer measures atmospheric aerosol absorption coefficient under the photothermal effect.The paper studies the relationship between the absorption coefficient of atmospheric aerosol particles and the refractive index change of the atmosphere.In Matlab environment, the variation curves of the output voltage of the interferometer with different concentration aerosol samples under stimulated laser irradiation were plotted.Besides, the paper also studies the relationship between aerosol concentration and the time required for the photothermal effect to reach equilibrium.When using the photothermal interferometry the results show that the time required for the photothermal effect to reach equilibrium is also increasing with the increasing concentration of aerosol particles,the absorption coefficient and time of aerosol in the process of nonequilibrium are exponentially changing.
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