热电堆传感器D203S红外体温计的设计+电路图
毕业论文关键词：红外；非接触式；热辐射；D203S
The Design of Infrared Thermometer
Abstract: Body temperature is one of the important indicators of human physiology. By measuring the body temperature can get a lot of health information for disease prevention and control. This paper presents the D203S, non-contact infrared thermometer based thermopile sensor. The sensor collects body heat radiation is converted to electrical signals of different strength, thereby completing the non-contact body temperature. D203S was consist of many thermocouples connected in series, and the sensor is coated with an optical bandpass filter coating, so that the sensor can sensitively detect infrared radiation of 5-14μm. Temperature is not the same as the infrared ray , resulting in different electrical signals, and then after a number of thermocouples connected in series and output of the esponding voltage to the corresponding temperature processed. Its operating temperature range is -20 ℃ ~ 100 ℃. The simulation tests show that this design can effectively complete the collection and processing of general temperature environment and so on.
Key Words: Infrared; Non contact; Heat radiation; D203S
目 录
摘要 1
引言 1
1.课题背景及发展 2
1.1 课题背景 2
1.2 红外测温现状及发展趋势 2
2.红外测温原理 2
2.1 普朗克黑体辐射定律 2
2.2 全辐测温法 3
3.系统方案设计 3
3.1 红外体温计整体结构 3
3.2 元器件的选择 4
3.3 系统总电路图 12
4.软件设计 12
4.1 主程序设计 12
4.2 按键扫描程序设计 13
5.系统仿真图 14
6. 结束语 15
参考文献 16
致谢 17
红外体温计的设计
引言
随着科学技术的日新月异以及人民生活水平的不断提高，传统接触式水银温度计已经不能满足社会的需求，而对于非接触式红外体温计的需求越来越大。非接触式红外体温计是一种不需要直接接触被测对象，即可测得温度的温度计。2003年的非典事件也使得对于非接触式红外体温计的研制与开发达到了顶峰。需求量的增大使人们希望能有测温距离较远，测温性能稳定同时价格又相对便宜的非接触式红外测温仪投入市场，以满足社会的需求。
本文首先详细地阐述了红外测温系统的工作原理，即物体的温度与其向外界辐射能量的大小之间有着固定的对应关系，用红外探测器检测出目标的热辐射大小，进而就能经信号处理模块计算目标的表面温度。最后本文设计了一套完整的红外测温系统，能够在大多数场合下通过非接触的方式实现对被测目标的快速测温。
1. 课题背景及发展