高精度双加热湿度传感器设计
发布时间：2018-08-23 15:31
【摘要】：湿度是大气监测和天气预报等相关研究的基础信息。在地面气象站中,为了避免雨雪对传感器的影响,湿度传感器被安装在防辐射罩内。但在降雨过程中和降雨后,防辐射罩表面沾附的水滴蒸发会引起传感器周围空气湿度增加,导致湿度测量数据高于真实值,引起沾湿误差。此外,长期暴露于高湿环境下,也会造成传感器损坏或读数偏高。本文提出了双加热湿度传感器系统,利用交替加热防雨帽的方式抑制沾湿误差。本设计制备了防雨帽,并通过计算流体动力学方法对防雨帽进行流固耦合传热仿真分析,求解防雨帽所需加热功率的特性参数,从而验证该策略的合理性。利用交替加热防雨帽的方式,使防雨帽在沾水时始终保持有一个传感器在测量。利用24位低噪声模数转换器和电容-数字转换器实现温度和湿度的低噪声、高线性度测量,以Optidew Vision冷镜式露点仪作为标定仪器并结合遗传算法拟合修正温漂,并将所采集的数据发送至上位机界面显示。实验结果表明,使用遗传算法拟合修正过后的传感器,相对湿度测量精度可达±1%RH,采用交替加热的方式可在6分钟内消除10%以上的的沾湿误差。与传统的湿度传感器相比,该设计具有精度高、响应速度快的特点,亦能够实现相对湿度的连续测量。本设计适用于高精度气象站,并有望在全球气候观测、气象灾害预警和航空气象保障中发挥作用。
[Abstract]:Humidity is the basic information of atmospheric monitoring and weather forecast. In order to avoid the influence of rain and snow on the sensor, the humidity sensor is installed in the radiation shield in the ground weather station. However, during and after the rainfall, the evaporation of water droplets on the surface of the shield will cause the increase of air humidity around the sensor, which leads to the humidity measurement data being higher than the real value and causing the humidity error. In addition, long-term exposure to high humidity will also cause sensor damage or high readings. In this paper, a double heating humidity sensor system is proposed, in which the humidity error is suppressed by alternately heating the rainproof cap. In this paper, the rainproof cap is prepared, and the fluid-solid coupling heat transfer simulation analysis is carried out by the computational fluid dynamics method, and the characteristic parameters of the heating power required for the rainproof cap are calculated, which verifies the rationality of the strategy. By alternately heating the rainproof cap, a sensor is always used to keep the cap in the water. Low noise A / D converter and capacitive digital converter are used to measure temperature and humidity with high linearity. Optidew Vision cold mirror dew point meter is used as calibration instrument and genetic algorithm is used to modify temperature drift. And the collected data to the upper computer interface display. The experimental results show that by using genetic algorithm to fit the modified sensor, the accuracy of relative humidity measurement can reach 卤1 RH, and the humidity error of more than 10% can be eliminated in 6 minutes by alternating heating. Compared with the traditional humidity sensor, the design has the characteristics of high precision and fast response, and can realize the continuous measurement of relative humidity. This design is suitable for high precision weather stations and is expected to play an important role in global climate observation, meteorological disaster warning and aviation meteorological support.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212
[Abstract]:Humidity is the basic information of atmospheric monitoring and weather forecast. In order to avoid the influence of rain and snow on the sensor, the humidity sensor is installed in the radiation shield in the ground weather station. However, during and after the rainfall, the evaporation of water droplets on the surface of the shield will cause the increase of air humidity around the sensor, which leads to the humidity measurement data being higher than the real value and causing the humidity error. In addition, long-term exposure to high humidity will also cause sensor damage or high readings. In this paper, a double heating humidity sensor system is proposed, in which the humidity error is suppressed by alternately heating the rainproof cap. In this paper, the rainproof cap is prepared, and the fluid-solid coupling heat transfer simulation analysis is carried out by the computational fluid dynamics method, and the characteristic parameters of the heating power required for the rainproof cap are calculated, which verifies the rationality of the strategy. By alternately heating the rainproof cap, a sensor is always used to keep the cap in the water. Low noise A / D converter and capacitive digital converter are used to measure temperature and humidity with high linearity. Optidew Vision cold mirror dew point meter is used as calibration instrument and genetic algorithm is used to modify temperature drift. And the collected data to the upper computer interface display. The experimental results show that by using genetic algorithm to fit the modified sensor, the accuracy of relative humidity measurement can reach 卤1 RH, and the humidity error of more than 10% can be eliminated in 6 minutes by alternating heating. Compared with the traditional humidity sensor, the design has the characteristics of high precision and fast response, and can realize the continuous measurement of relative humidity. This design is suitable for high precision weather stations and is expected to play an important role in global climate observation, meteorological disaster warning and aviation meteorological support.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212
【参考文献】
相关期刊论文 前10条
1 周悦;刘清`，
本文编号：2199490
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