Microwave Application In Grain Insecticidal Research And Experiment Device Design

In the process of grain storage, pests not only cause the loss of substantial quantities of food, but also is an important factor to directly affect the food quality. Pest control of the stored grain on the production of human life is of great economic significance. At present, the stored grain pest control methods include chemical method, biological method and physical method. Chemical fumigation is the most effective and most commonly used method at home and abroad. However, the problem of 3R (resistant, pharmaceutical residues, rampant resurgence), food safety issues and environmental pollution will arise, which has also aroused very high concern. While other methods are difficult to promote because of their poor effects, long processing time, poor product quality, and high investment cost.Directing at the questions and weaknesses mentioned above, this paper deduces the expression in the field in the rectangular waveguide based on the theory and features of microwave heating and Maxwell equations, deduces high-order mode and the field structure in the rectangular waveguide in-depth, and further extends to the rectangular cavity, at last a device used to kill grain storage pest is designed with the application of these theories. In the process of design, the size of cavity, the choice of mode, the choice of position of coupler, and the uniformity of the heat should be taken into account. The output power of the entity is evaluated and the ability of insecticide is experimented. It turns out that this design consumes less power, requires less investment and has a better effect in insecticiding. Thus the design is practical. Since it's a new method which is highly effective, safe and friendly to the environment, it can be promoted extensively.At the same time, this text also aims at the difficult reality of measuring temperature of infield by microwave, puts forward an improved method of platinum electric resistance sensor, and applies it to measure (control) the temperature of acid or alkaline solution of the microwave field. Experiment shows that it is effective of this improvement.