高精度雙加熱濕度傳感器設(shè)計(jì)
發(fā)布時(shí)間：2018-08-23 15:31
【摘要】：濕度是大氣監(jiān)測(cè)和天氣預(yù)報(bào)等相關(guān)研究的基礎(chǔ)信息。在地面氣象站中,為了避免雨雪對(duì)傳感器的影響,濕度傳感器被安裝在防輻射罩內(nèi)。但在降雨過(guò)程中和降雨后,防輻射罩表面沾附的水滴蒸發(fā)會(huì)引起傳感器周圍空氣濕度增加,導(dǎo)致濕度測(cè)量數(shù)據(jù)高于真實(shí)值,引起沾濕誤差。此外,長(zhǎng)期暴露于高濕環(huán)境下,也會(huì)造成傳感器損壞或讀數(shù)偏高。本文提出了雙加熱濕度傳感器系統(tǒng),利用交替加熱防雨帽的方式抑制沾濕誤差。本設(shè)計(jì)制備了防雨帽,并通過(guò)計(jì)算流體動(dòng)力學(xué)方法對(duì)防雨帽進(jìn)行流固耦合傳熱仿真分析,求解防雨帽所需加熱功率的特性參數(shù),從而驗(yàn)證該策略的合理性。利用交替加熱防雨帽的方式,使防雨帽在沾水時(shí)始終保持有一個(gè)傳感器在測(cè)量。利用24位低噪聲模數(shù)轉(zhuǎn)換器和電容-數(shù)字轉(zhuǎn)換器實(shí)現(xiàn)溫度和濕度的低噪聲、高線性度測(cè)量,以O(shè)ptidew Vision冷鏡式露點(diǎn)儀作為標(biāo)定儀器并結(jié)合遺傳算法擬合修正溫漂,并將所采集的數(shù)據(jù)發(fā)送至上位機(jī)界面顯示。實(shí)驗(yàn)結(jié)果表明,使用遺傳算法擬合修正過(guò)后的傳感器,相對(duì)濕度測(cè)量精度可達(dá)±1%RH,采用交替加熱的方式可在6分鐘內(nèi)消除10%以上的的沾濕誤差。與傳統(tǒng)的濕度傳感器相比,該設(shè)計(jì)具有精度高、響應(yīng)速度快的特點(diǎn),亦能夠?qū)崿F(xiàn)相對(duì)濕度的連續(xù)測(cè)量。本設(shè)計(jì)適用于高精度氣象站,并有望在全球氣候觀測(cè)、氣象災(zāi)害預(yù)警和航空氣象保障中發(fā)揮作用。
[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 鹵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.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：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 鹵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.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP212
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 周悅;劉清`，
本文編號(hào)：2199490
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