Fuzzy location device based on infrared light intensity modulation

摘要

Most of the traditional distance measurement using electromagnetic waves or electromagnetic pulse time of flight to obtain distance information. It has been widely used in various fields ranging. Accuracy and high resolution can get by the method. Ranging in many occasions does not need high accuracy and resolution. For example, it can reverse radar, blind obstacle avoidance, etc. This paper presents a new distance measuring device that based on infrared light intensity modulation. Moreover the device combine with the fuzzy control theory, so called fuzzy location device based on infrared light intensity modulation. The device includes the infrared modulation transmission unit, collimating unit, infrared receiver unit, background light sensor unit and data processing unit. If alarm distance is n m, data processing unit set infrared light intensity of infrared modulation transmission unit and the light intensity threshold of infrared receiver unit by look-up table with fuzzy control theory. It is according to the current background light intensity. Once the receiving light intensity exceeds the threshold, the system alerts. The paper expounds the working principle, fuzzy control theory on the domain and fuzzy rules domain, the experimental results of the device and analysis in detail. It shows that the device is small, low cost and suitable for a large number of used when it dose not need high accuracy and resolution measurement