| Popis: |
This design of alcohol detection system uses DSP technology, ADF4350 frequency synthesizer chip developed microwave source controlled by DSP controller, the source excites the microwave resonator cavity, the output signal of the resonator is detected by the detector, then sampled and processed by the DSP processor, and the concentration of alcohol is calculated by perturbation theory and dielectric properties of alcohol. The human-computer interaction of this system is realized by touch screen, so that the display looks easy to operate and very user-friendly. This paper analyzes the feasibility of microwave resonant cavity perturbation method in alcohol materials, and derives the relationship between the concentration of alcohol mixed solution, the dielectric constant and the output frequency of the resonant cavity, and the theoretical basis of this paper is derived. The dielectric properties of different alcohol concentration at different frequencies were studied, and the standard curves of different concentration alcohol dielectric spectra were established by the theoretical model and a large number of experimental data. |
