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For the purpose of providing a method to estimate the effect of vibration on ultrasonic combustion engine in laser diagnosis, numerical simulation and experimental technology in this report for misalignment of basic optical system under interference vibration are studied. To provide a method to estimate the effect of vibration on the optical performance of a combustion diagnostic optical system, a numerical calculation method for the misaligned optical system under interference vibration was proposed. With the ANSYS finite element analysis software, the physical model of misaligned optical system under interference vibration was developed and the transient dynamic analysis was inspired by vibration displacement got by sensors .Then dynamic response of the mirror was obtained by transient dynamic analysis. On the basis of the matrix optics, geometrical optics theory and the mechanic vibration theory, the vibration misalignment matrix of mirror was analyzed, and the vibration misalignment model was also built. Meanwhile, the method of simulating calculation of misaligned optical system under interference vibration was inferred. Furthermore, an experiment was carried out to validate the method. The results show that the high precision of the simulation and the relative error of simulation calculation and experimental data can reach at 4.1% and 0.8% in the horizontal and vertical direction. The calculation proves to be highly precise. This research can be used in improving the stability and capability for avoiding vibration of laser diagnostics integrated system in intricacy environment. The numerical method can be used in laser diagnostics application.

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