Disclosed is an infrared spectrometer accessory, comprising: a sample chamber (20), provided with a sample cavity and a detection light path channel (230) in communication with the sample cavity; and an ultrasonic generator (10), comprising an energy converter (120) and an amplitude-change pole (110) that delivers energy from the energy converter (120) to the sample cavity. With the detection of the infrared spectrum, samples are evenly dispersed by the ultrasonic generator (10) so as to ensure that reactants react with each other uniformly during detection, so that an experimenter can observe more accurately a liquid phase chemical reaction process and a bacterial adhesion state to acquire more accurate experimental data.
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