Some key issues in the process of simulating millisecond laser damage to K9 glass based on Multiphysics field simulation are analyzed through several aspects such as the establishment and meshing of the millisecond laser damage K9 glass finite element model, loading of the pulsed laser, setting the initial conditions and boundary conditions. The finite element model of K9 glass damaged by millisecond laser was established, and the temperature and stress distribution of K9 glass irradiated by millisecond laser were numerically analyzed. The calculation results show that the spot radius and pulse frequency have a greater influence on the damage effect, the higher the frequency, the greater the thermal stress generated, and the stronger the damage effect; the larger the laser spot radius, the smaller the thermal stress generated, and the weaker the damage effect. Therefore, the laser damage threshold will be the spot radius, the pulse frequency of the regular change, that is, with the pulse frequency and spot radius increases, the damage threshold decreases.
The optical structure design and simulation of vehicle rainfall sensor are carried out with ZEMAX. Two groups of six infrared LED for star-shaped layout. The design of incident Angle of infrared pulse light is greater than the critical angle of total reflection when there is no rain and each group of infrared LED works at a certain time sequence. The rainwater on the windshield of the car changes the refractive index of the emitting medium of the pulsed infrared ray, which causes the attenuation of the luminous flux of the receiver's infrared ray and the detection circuit will generate impulse signal. Using fast Fourier transform and fuzzy control technology, the output signal of different windshield rainfall is given, and the output signal is communicated with the body control computer by the built-in LIN bus module of the single-chip microcomputer, so as to realize the automatic control of the windshield wiper in the driving rain and accidental muddy water splashing.
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