DLC (diamond-like carbon) films have excellent optical properties, especially in the mid-infrared band (8-14 micron). Because of the adjustable refractive index in a certain range, it can be matched with more infrared materials, which is a hot research topic in infrared optics. In this paper, the effects of technological parameters and mixed gases (H2 and Ar) on the structure and properties of DLC films were studied. The results show that the process parameters can change the structure of the film, so that some properties of the film can be changed accordingly, but DLC films with high thermal stability and low internal stress can not be obtained simultaneously. When other gases are mixed in the reaction source gas, the structure and properties of the film will change, which is mainly due to the different role of the introduced gas in the film deposition process.
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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