热电堆型总辐射传感器设计
发布时间：2018-11-07 18:53
【摘要】：太阳总辐射是气象探测、太阳能资源利用等领域中的一种重要测量参数。太阳总辐射传感器是一种重要的地面气象观测仪器,也是太阳能资源普查与光伏电站运行监控领域不可缺少的装备。目前国外的太阳总辐射传感器精度高,但价格昂贵。为设计出低成本、高精度的太阳总辐射传感器,本文针对环境温度会影响总辐射测量准确度的问题,提出了一种基于热电效应的总辐射传感器设计。该传感器系统由传感器探头、信号采集电路、温度补偿算法、嵌入式系统及上位机构成。利用计算流体动力学方法对该传感器探头进行了流-固耦合传热分析。硬件方面,本文选用低功耗和高性价比的STM32作为主控芯片,设计了一种高精度AD采集电路,运用热电堆、PT100温度传感器进行测量。为了简化硬件电路,同时保证测量的高精度,利用了 Levenberg-Marquardt算法对热电堆温度特性进行拟合测量温差;为了消除环境温度引起的总辐射测量误差,采用了Back-Propagation (BP)神经网络修正温漂;为了方便观测者使用,本文开发了基于C#的配套上位机软件。本系统中,传感器的温度补偿范围为-20℃～40℃,外场测试结果表明,利用修正算法进行误差修正后,读数精度可达2.79%,满量程精度达1.66%。该传感器在气象探测、光伏电站等领域具有应用潜力。
[Abstract]:Total solar radiation is an important measurement parameter in meteorological survey, solar energy resource utilization and so on. The total solar radiation sensor is an important surface meteorological observation instrument, and is also an indispensable equipment in the field of solar energy resources survey and photovoltaic power station operation monitoring. At present, the precision of the total solar radiation sensor is high, but the price is expensive. In order to design a low cost and high precision total solar radiation sensor, a total radiation sensor based on thermoelectric effect is proposed to solve the problem that ambient temperature will affect the accuracy of total radiation measurement. The sensor system consists of sensor probe, signal acquisition circuit, temperature compensation algorithm, embedded system and upper system. The fluid-solid coupling heat transfer analysis of the sensor probe was carried out by using computational fluid dynamics (CFD) method. In the aspect of hardware, STM32 with low power consumption and high performance-to-price ratio is selected as the main control chip. A high precision AD acquisition circuit is designed, which is measured by thermoelectric stack and PT100 temperature sensor. In order to simplify the hardware circuit and ensure the high accuracy of measurement, the temperature difference of thermoelectric stack is fitted by Levenberg-Marquardt algorithm. In order to eliminate the total radiation measurement error caused by ambient temperature, the Back-Propagation (BP) neural network is used to correct the temperature drift, and in order to facilitate the use of the observer, a computer software based on C # is developed in this paper. In this system, the temperature compensation range of the sensor is -20 鈩，
本文编号：2317276
[Abstract]:Total solar radiation is an important measurement parameter in meteorological survey, solar energy resource utilization and so on. The total solar radiation sensor is an important surface meteorological observation instrument, and is also an indispensable equipment in the field of solar energy resources survey and photovoltaic power station operation monitoring. At present, the precision of the total solar radiation sensor is high, but the price is expensive. In order to design a low cost and high precision total solar radiation sensor, a total radiation sensor based on thermoelectric effect is proposed to solve the problem that ambient temperature will affect the accuracy of total radiation measurement. The sensor system consists of sensor probe, signal acquisition circuit, temperature compensation algorithm, embedded system and upper system. The fluid-solid coupling heat transfer analysis of the sensor probe was carried out by using computational fluid dynamics (CFD) method. In the aspect of hardware, STM32 with low power consumption and high performance-to-price ratio is selected as the main control chip. A high precision AD acquisition circuit is designed, which is measured by thermoelectric stack and PT100 temperature sensor. In order to simplify the hardware circuit and ensure the high accuracy of measurement, the temperature difference of thermoelectric stack is fitted by Levenberg-Marquardt algorithm. In order to eliminate the total radiation measurement error caused by ambient temperature, the Back-Propagation (BP) neural network is used to correct the temperature drift, and in order to facilitate the use of the observer, a computer software based on C # is developed in this paper. In this system, the temperature compensation range of the sensor is -20 鈩，
本文编号：2317276
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