基于半导体制冷技术的温度控制系统研究

发布时间：2018-01-03 11:10

  本文关键词：基于半导体制冷技术的温度控制系统研究　出处：《中国民航大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 半导体制冷 温度控制 惯导系统 LabVIEW 最小二乘法

【摘要】：惯性导航系统能够自主定位并提供载体姿态和加速度信息的特性,使其在航空航天领域有着不可替代的作用。由于陀螺仪和加速度计作为惯性导航系统的核心器件对温度的敏感性,温度漂移已成为主要的误差源。为降低温度对惯导测量精度的影响,创造一个小空间的恒温环境对陀螺和加表进行测试和温度补偿将是一个有益的尝试。本文所设计的基于半导体制冷技术的温度控制系统,包括TEC温度控制硬件系统和LabVIEW温度监控人机交互系统。下位机实时采集三路DS18B20温度传感器的数据并送入LCD显示,根据实际温度与目标温度的差值通过分段PID温度控制算法输出对应数字控制量,经两路DAC模块转换,输出可控电流驱动两组半导体制冷模块协同控制温箱使其达到目标温度。上位机通过RS232串口与下位机通讯,实现温度的同步采集、显示、绘图、报警和数据保存等功能。系统温控性能与惯导温度补偿测试实验时,首先采用最小二乘法对温度传感器进行标定,DS18B20最大平均误差由0.465℃降至0.075℃,测量精度明显提高;然后经过可靠性和稳定性实验,系统连续运行40小时无任何故障;接着对系统进行了测温精度和控温效果实验,实验结果表明,系统测量误差在0.1℃以内,温控精度基本达到设计的±0.5℃的目标;最后进行了实际的惯导温度补偿测试实验,系统用于某型MEMS惯导模块实际温度补偿测试,整体效果较理想。
[Abstract]:The inertial navigation system can independently locate and provide the characteristics of carrier attitude and acceleration information. Because gyroscopes and accelerometers are the core devices of inertial navigation system, they are sensitive to temperature. Temperature drift has become the main error source. It will be a beneficial attempt to create a small space constant temperature environment to test and compensate the gyroscope and meter. A temperature control system based on semiconductor refrigeration technology is designed in this paper. It includes TEC temperature control hardware system and LabVIEW temperature monitoring man-machine interactive system. The lower computer collects the data of three DS18B20 temperature sensors in real time and sends them to LCD display. According to the difference between the actual temperature and the target temperature, the corresponding digital control quantity is output through the subsection PID temperature control algorithm, which is converted by two DAC modules. The output controllable current drives the two groups of semiconductor refrigeration modules to control the temperature box to achieve the target temperature. The upper computer communicates with the lower computer through RS232 serial port to realize the synchronous acquisition display and drawing of temperature. System temperature control performance and inertial navigation temperature compensation test experiment, the least square method is first used to calibrate the temperature sensor. The maximum average error of DS18B20 is reduced from 0.465 鈩，

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