文档介绍：SHANDONGUNIVERSITY OF TECHNOLOGY
毕业论文
基于PSD浓度检测系统设计与分析
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2011 年 6 月
摘要
在化工制药、轻工食品饮料环保等各部门以及科研国防各个领域,都要求对液体浓度等参数进行检测与控制。目前,工业生产中检测液体浓度的方法比重法、化学分析法、超声波法及光学法等。但这些方法都需要费时和繁琐的人工取采样,滞后性大,无法实现液体浓度的实时在线检测,鉴于以上存在的问题,本文设计了一种基于位置敏感器件(PSD)的新型浓度检测系统。
本系统是利用当入射光线固定,液体的浓度发生变化将导致其折射率也跟着变化这一理论基础,利用位置敏感探测器测量出光线偏移量的大小,进而得出液体的折射率并计算出液体的浓度。所以,基于PSD的浓度检测系统主要由半导体激光器、双隔离窗光学系统、PSD信号处理电路、基于MSP430单片机的A/D采集运算控制电路和显示电路等组成。由激光器发出激光,经过光学系统照射在一维PSD上,PSD信号经处理电路,再由单片机A/D转换模块将模拟量转换为数字量,同时单片机处理数据后,由显示电路显示出待测液体的浓度。
基于PSD的浓度检测系统检测方法的准确性在理论分析和实验仿真中得到了验证,实验表明,该系统具有结构简单、灵敏度高、稳定性好、响应时间快以及自动化程度高等优点,能够方便、准确地实现液体浓度的实时在线检测。
关键词:浓度检测, 位置敏感器件(PSD),半导体激光器,MSP430单片机
ABSTRACT
In the chemical and pharmaceutical, light industry and food and beverage and environmental protection departments and the various fields of scientific research and national defense are to detect and control the parameters of the liquid concentration. At present, the proportion of liquid concentration detected in the industrial production method, chemical analysis, ultrasonic and optical method. However, these methods are time-consuming and tedious manual to take sampling lag, can not achieve real-time online detection of the liquid concentration, in view of the above problems, this paper designs a new type of concentration detection system based on position sensitive detector (PSD). In the chemical and pharmaceutical, light industry and food and beverage and environmental protection departments and the various fields of scientific research and national defense are to detect and control the parameters of the liquid concentration. At present, the proportion of liquid concentration detected in the industrial production method, chemical analysis, ultrasonic and optical method. However, these methods are time-consuming and tedious manual to take sampling lag, can not achieve real-time online detection of the liquid concentration, in view of the above problems, this paper designs a new type of concentration