一种红外制冷剂检漏仪的研究设计

发布时间：2018-03-20 22:16

本文选题：红外光谱吸收　切入点：制冷剂　出处：《合肥工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：在制冷系统中,制冷剂泄漏是一种常见的故障现象。制冷剂的泄漏不仅会造成制冷设备的损坏和经济上的损失,而且还会破坏臭氧层、带来温室效应,给人们正常的生活和生产带来诸多不良的影响。针对制冷剂的泄漏,本文研究并设计了一种制冷剂检漏仪。该检漏仪采用红外光谱吸收技术,适用于R12和R134a两种制冷剂的泄漏检测,且灵敏度可达到6g/year。本文主要研究的内容有：1、建立红外光谱吸收模型。通过对红外光谱吸收理论的研究,采用单光路双波长测量方法建立红外光谱吸收模型,并在此基础上推导出适用于本系统的检漏算法。2、提出了红外气体传感器的总体设计方案。本文对红外传感器的组成部件：红外光源、测量气室、红外探测器进行选型和设计,选择能够分别覆盖R12和R134a的红外特征吸收谱线的红外滤光片,确定红外光源的调制频率,实现红外光谱吸收模型。3、对系统进行需求分析,采用模块化设计理念,设计出检漏系统的硬件及软件实现方案。硬件设计主要包括电源供电模块、红外光源驱动电路、信号调理电路模块以及主控处理模块。其中,主控处理模块采用ADμC842微控处理器作为核心,包含了抽气泵控制、LCD液晶显示、按键检测、声光报警以及串口通信等外围电路。软件方面应用C语言及汇编语言编程,实现系统的初始化模块、数据采集与处理模块、泄漏判定模块以及各外围模块功能。
[Abstract]:Refrigerant leakage is a common fault in refrigeration systems. Refrigerant leaks not only cause damage to refrigeration equipment and economy, but also damage the ozone layer and bring Greenhouse Effect. This paper studies and designs a refrigerant leak detector, which uses infrared absorption technology. It is suitable for leak detection of two refrigerants, R12 and R134a, and the sensitivity can reach 6 g / year. the main contents of this paper are: 1: 1, the infrared absorption model is established, and the absorption theory of infrared spectrum is studied. The infrared absorption model was established by using the method of single optical path and double wavelength measurement. On this basis, the leak detection algorithm. 2, which is suitable for this system, is deduced, and the overall design scheme of infrared gas sensor is put forward. In this paper, the components of infrared sensor: infrared light source, measuring gas chamber, infrared detector are selected and designed. The infrared filter which can cover the infrared characteristic absorption lines of R12 and R134a respectively is selected, the modulation frequency of infrared light source is determined, the infrared absorption model .3 is realized, the demand analysis of the system is carried out, and the modular design idea is adopted. The hardware design includes power supply module, infrared light source driving circuit, signal conditioning circuit and main control processing module. The main control processing module uses AD 渭 C842 microcontrol processor as the core, including peripheral circuits such as liquid crystal display, keystroke detection, acousto-optic alarm, serial communication and so on. The software is programmed with C language and assembly language. System initialization module, data acquisition and processing module, leak detection module and each peripheral module function.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB64;TN219

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