Analysis Of Infrared Sensing Mechanism And Biomimetic Study Of Small Fire-loving Beetle

The fire-loving beetle has a unique ability to perceive forest fires.The infrared radiation and smoke of a forest fire will attract the fire-loving beetle.Some fire-loving beetles can detect large fires dozens of kilometers away.The small ash beetle belongs to the small fire-loving beetle.In this thesis,through the thermal performance analysis of the finite element model of the small ash beetle infrared sensor,the possible functions of the small beetle infrared sensor are preliminary studied.Based on the principle of bionics,the advantages of the fire-loving beetle are applied to the engineering field.This thesis takes the fire-loving beetle as the research object.Mainly studied the unique infrared sensor structure of the ash beetle and applied it to the design of infrared detector.In this thesis,based on the smoke-sensing ability of the fire-loving beetle,the research on olfactory location of the gas source was carried out.The main research contents are as follows:(1)Research on infrared sensing mechanism of the small ash beetle.The disc perceptron is simplified into the finite element model of the infrared focal plane array(FPA).Then the finite element models are named according to the constant thermal load applied to different end faces:model(?),model(?)and model(?).The model(?)is the beetle perceptron model.The maximum temperature rise when a single thermal radiation load and multiple thermal radiation loads are applied to the three models are respectively calculated.Their thermal performance is analyzed,and the thermal imaging performance of the three models is numerically simulated.The results show that the constructed perceptron model has excellent infrared detection performance,and the perceptron model can distinguish the rough outline of the infrared target.(2)Thermal analysis based on substrate-free FPA.Based on the substrate-free FPA model,it is divided into three groups by setting different boundary conditions:FPA model with substrate,small beetle perceptron model,and substrate-free FPA model.Then apply a thermal load at the center of the three sets of FPA models,and the infrared detection performance of the three sets of models is analyzed based on the simulation results,and the total thermal conductivity and thermal response time of the three sets of models are calculated.The results show that the second group of small beetle perceptron models have the best thermal insulation performance,the lowest total thermal conductivity,and the response time is in the millisecond level.(3)Single-end-beam thermopile infrared detector based on bionics.Inspired by the small ash beetle,a small,high-performance single-end-beam thermopile infrared detector was designed to solve the problem that the surface area of traditional four-end-beam thermopile infrared detector cannot be effectively utilized.In this structure,silicon nitride is selected as the material of the absorption layer,and P/N polysilicon is the material of the thermocouple bar.Numerical analysis and finite element simulation are carried out on the single-end-beam and four-end-beam thermopile infrared detectors.The results show that the structural size of the single-end-beam thermopile can be smaller than the traditional four-end beam structure and maintain relatively high performance parameters.(4)Research on olfactory positioning based on bionic mechanism.With inspir-ation from animals such as fire-loving beetles,gas sensors are combined with robots to simulate the location of odor sources.Different gas diffusion models are introduced,Fluent and Matlab are combined to simulate the smoke plume diffusion,and a simulation platform for odor source location is established.Finally,a Gaussian gas diffusion model with different diffusion parameters?_zand?_ywas simulated in Matlab,and a simplified evolutionary gradient algorithm was used to successfully locate the odor source under different concentration distribution environments.