Research on Non-Contact Weak Current Detection Technology

With the continuous development of industrial technology, the weak current plays an increasingly important role in all fields of life. In order to facilitate the user to carry, the study of contactless weak current measurement technology is also emerging. This article’s design idea is based on two-dimensional reluctance sensor device built non-contact weak current detection system. The system uses the reluctance sensor HMC1002 to collect the current signal and the temperature sensor DS18B20 to compensate the temperature. The signals collected by the reluctance sensor and the temperature sensor are extremely weak. After being amplified by the amplifying circuit, the signal is conducive to subsequent detection and processing. Filter circuit can filter out interference signals to achieve the goal of improving accuracy. After the corresponding algorithm of the microcontroller will convert the signal voltage, easy to read and store, thus designing a non-contact current measurement capable of detecting weak currents and achieving higher accuracy.

基于碲化镉量子点的滚动轴承内圈测温原理与实现技术

滚动轴承高速运转时,内圈温度对轴承早期故障信息更加敏感,研究内圈温度测量技术能更好监测轴承的运行状态。基于量子点材料的感温感光特性,提出一种滚动轴承旋转组件(内圈、保持架等)温度测试新思路——利用量子点材料激发的荧光光谱特质获取轴承旋转组件的表面温度信息。简述碲化镉量子点材料的非接触测温原理,基于层层自组装方法,将水相制备工艺的碲化镉量子点制备成PDDA聚电解质-Cd Te量子点复合薄膜温度传感器,并对量子点温度传感器特征参数(峰值波长、荧光强度和半峰宽等)进行热特性研究,实现了其峰值波长与所感知环境温度变化的线性关系,并在不同温度循环及旋转条件下进行验证及测试标定。设计试验台,开展角接触球轴承内圈温度的在线试验测试,实现了滚动轴承服役条件下内圈的非接触测温技术,获取了轴承内圈温升历程曲线,并利用传统热电偶测试方法进行了间接验证。

红外测温在半导体器件动态热分析中的应用

介绍了显微红外热像仪连续稳态测温技术的特点,通过试验说明了连续稳态显微红外测温技术在半导体器件动态热分析中的应用。在器件的结温测试中,通过对器件持续的加电,利用连续稳态显微红外测温技术连续地增加偏执电压的测试,研究了器件的不同位置在不同的加电条件下的发热情况。另外,在器件的破坏性试验中,利用显微红外热像仪的连续稳态测温技术,研究了器件的终值温度和破坏情况,为设计者改进设计和控制工艺提供了很好的指导。

Study on body temperature detection of pig based on infrared technology: A review

Body temperature is an important physiological indicator in the whole process of pig breeding.Temperature measurement is also an effective means to assist in disease diagnosis and pig health monitoring.In the conventional method of measuring body temperature,a mercury column is used to obtain the rectal temperature.The operation of thismethod is complicated and requires a large amount of labor.This kind of temperature measurement method is contact and canmake the pig stressed,which is disadvantageous for the healthy growth of pigs.Therefore,rectal temperaturemeasurement no longer meets the needs of the large-scale pig industry in China's welfare agriculture.In recent years,the emerging pig body temperature detection technologies are electronic temperaturemeasurement technology,infrared temperature measurement technology and so on.Infrared temperature measurement technology has been the main means of measuring the temperature of pig body surface with its advantages of non-contact,long distance and real-time.At present,infrared temperature measurement technology and infrared image processing technology used in pig breeding are still in the exploration stage.Nowadays,the infrared temperature measurement equipment based on point-by-point analysis represented by infrared thermometer and temperature measurement equipment based on full-field analysis represented by infrared thermal imager have been applied to pig breeding industry.These types of temperaturemeasurement are more in line with the needs of the pig breeding industry to transform and upgrade to the automation,in line with the development concept of welfare farming and smart agriculture,and its development prospects are very impressive.

智能型红外在线监控系统在无人值守变电站中的应用

介绍了智能型红外在线监控系统的特点、功能、结构及其在智能电网无人值守变电站中的应用,该系统可自动完成设备故障报警、录像、报告生成以及控制智能监控预警等工作,可将与温度有关的设备维护工作从预防性人工检修提升到预知性无损检测,能提高设备故障的处理速度,减轻运行维护人员的工作强度,节约设备维护成本。该技术的应用可提高电网运行的可靠性和智能化水平。