共查询到19条相似文献,搜索用时 156 毫秒
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通过分析影响热敏电阻和双金属片测温精度的主要原因,并采用均方差,离散率对实时探测资料进行对比分析,说明测温元件的稳定性和可靠性。 相似文献
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针对AOD红外副枪测温法中多种不确定背景辐射导致的发射率波动问题,提出了基于双色测温原理和黑体等温空腔理论的底枪测温法,稳定了铁水的发射率.应用基于最小二乘法的曲线回归实现红外测温设备的现场校准,完成温度补偿.通过在样炉上的精炼实验证明底枪测温系统具有较高的精度和可重复性,可以满足实际生产的要求. 相似文献
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本文介绍一种测温用的热敏电阻频率转换电路的工作原理。该电路十分简单,精度高,成本低,提高热敏电阻测温的分辩率,与任何型号微计算机连接的接口简单且无附加误差。通过实测的温度一频率数据分析,两者具有很高的相关性。 相似文献
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介绍WP3103型区域自动气象站测量温度的原理,以及该仪器维修的基本方法和要求,阐述自动气象站测温故障的判断,列举了一些温度故障实例。 相似文献
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利用时域中的卷积积分法求解测温传感器响应方程,对其响应特性尤其是自动平均能力进行了数学描述,发现每个时刻测温传感器输出值,是此时刻之前一段时间内外界温度输入值的不等权平均值,其权重随着与输出时刻的接近呈指数增加。进一步应用这个结论讨论了不同来源温度资料的同化问题,对资料同化技术的提高有一定的指导意义。 相似文献
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基于1981—2021年北京地区6个气象站的逐日最大冻土深度、平均气温、平均地表温度及5、10、15、20、40、80 cm地温等资料,分析了近40年北京地区最大冻土深度的时空分布特征及其与气温和地温的关系。结果表明:北京地区最大冻土深度总体呈变浅趋势,气候倾向率为-2.3 cm/10 a,各站点最大冻土深度变浅趋势从西到东呈逐渐减弱趋势。北京地区最大冻土深度与40、80 cm地温相关性最好,与地表温度相关性较差。选取2021至2022年北京地区冻土对比试验数据,评估测温式冻土自动观测仪观测精度,发现仪器安装至少一个冻融周期后与冻土人工观测吻合度更好,测温式冻土自动观测仪的观测精度与仪器安装位置的地下岩层、土质分布密切相关,需要在仪器稳定运行后根据当地实际优化算法和冻融阈值。 相似文献
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针对气象观测现有的Pt100铂电阻地温传感器存在线缆复杂,维护和更换不便的问题,设计了1种无线地温测温系统。该系统以恒流源对4线制Pt100铂电阻进行测温,并对测温信号进行滤波和放大,以内部集成A/D转换功能的STC12C5A60S2单片机为控制芯片,以nRF905芯片作为无线收发模块。该测温系统通过无线传输数据的方式,有效的减少了现有自动气象站的地温观测的线缆长度和复杂度,使地温传感器的维护、更换和现场检定工作更加便利。该系统为传感器配置使用了LCD1602液晶显示屏进行温度显示,使测温系统能够进行无线传输的同时,发射端也可作为独立的温度计使用。 相似文献
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论Eppley PIR精密红外辐射仪的测量精度 总被引:1,自引:0,他引:1
本文依据红外辐射表(PIR)的结构、性能和工作原理讨论了测量精度及有关影响因素,比较了粗测和精测两种方法的特点,在此基础上提出了各测量方法的适用范围和精度范围以及提高测量精度的措施,同时也给出了一些特定场合下的测量实例及提高测量精度的具体方法。分析表明:精测方法具有很好的测量精度以及很强的环境适应性。粗测在限定的温度范围内具有测量简单、换算方便、易于实现自动化等优点,精度尚能满足一般要求,但在限定的温度范围以外,测量精度急剧恶化。在影响测量精度的各因素中以温度响应中表体热辐射测量的影响最大,在粗测方法中表内电池的性能与测量精度关系重大。强烈日射对测量精度有一定影响,经订正后可基本消除。 相似文献
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针对天气雷达固定测试平台存在无法完成雷达系统、分系统关键参数测试;便携式移动测试平台不具备对雷达自动控制功能,无法实现一键自动化测试功能;以及雷达故障诊断不具备智能诊断等缺点,设计了一种基于天气雷达移动测试保障平台的自动智能化测试系统,该系统由软件系统、嵌入式计算机系统、测量仪器功能组件以及测试适配接口四大部分组成。该系统基于标准总线与合成仪器的架构,采用高集成度的射频收发硬件平台和具有二次开发能力的开放式可扩展软件平台相结合进行设计。通过仪表和雷达自动化控制、测试数据自动采集和处理、测试报表自动生成、基于逻辑判断的故障智能定位等技术,实现了雷达参数自动化一键测试和定标,以及雷达故障智能定位等功能。结果表明,该系统能提高雷达现场测试、定标和故障诊断效率。 相似文献
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张莉萍 朱健 朱永生 霍丽 木明江·吾守尔 ZHANG Li-ping ZHU Jian ZHU Yong-sheng HUO Li Muminjian· WUXUR 《沙漠与绿洲气象(新疆气象)》2007,1(1):36-38
在悬移质输沙率与流量异步施测法基本原理分析的基础上,根据河流特性建立了多年综合及相邻流量测次累积面积百分数与累积流量百分数相关曲线法不同的部分流量权重系数借用方案。经实测资料检验输沙率与流量异步施测法的计算误差符合《河流悬移质泥沙测验规范》精度要求,能满足悬移质泥沙测验的生产需求。 相似文献
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利用敦煌、安西、金塔三地气象和病虫害资料,应用农业气象中的统计方法,分析了棉花病虫繁殖危害与气象条件的关系。结论是:影响棉花产量及品质的主要虫害是棉蚜、棉铃虫、棉红蜘蛛;影响虫害繁殖的主要气象因子是温度、湿度、降水等。可以通过采取生态措施和工程措施改善病虫害对棉花的威胁程度。 相似文献
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In climate research, the intensity of a storm track is often measured by the band pass filtered eddy kinetic energy, geopotential variance or related variables. The interpretation of such fields disregards the influence the advection speed might have on these measures. In this paper the need for a Doppler corrected storm track measure is discussed. A Doppler corrected measure is defined and applied to 10 years of ECMWF reanalysis data, correcting the storm track measure for spatial and temporal variability of the advection speed. The storm track intensity is also calculated correcting only for the temporal variability of the advection speed. It is also related to fluctuations of the NAO teleconnection pattern. The Doppler correction suggests that (1) maximum and minimum baroclinic activity is found somewhat downstream of the locations indicated by non-corrected measures, (2) the storm track activity estimated by conventional measures is much too low in the areas of the eastern ends of the storm tracks, (3) the monthly mean time series of the strength of a storm track, as estimated by conventional measures, is strongly influenced by the variability of the advection speed at times, (4) the strength of the storm track seems to be less strongly connected with teleconnection patterns such as NAO or with the background mean flow speed than usually thought on the basis of conventional Eulerian statistics. 相似文献
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Summary Multivariate randomized block permutation procedures (MRBP) can be used effectively to verify numerical models. Compared to other statistical methods, MRBP shows several distinct advantages. First of all, MRBP operates in the same Euclidean analysis space as its input data. The root mean square error (RMSE) is discussed, since it is a natural choice as a distance measure between two data sets and is closely related to the distance measure on which MRBP is based. The RMSE by itself provides no basis for inferential comparisons, whereas MRBP is well suited for such deductions. Since MRBP is computationally economical and requires only a few case studies for meaningful comparisons, it is also useful for model development.With 3 Figures 相似文献
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Avoiding dangerous climate change will require a rapid transition away from fossil fuels. By some estimates, global consumption and production of fossil fuels—particularly coal and oil—will need to end almost entirely within 50 years. Given the scale of such a transition, nations may need to consider policies that constrain growth in fossil fuel supplies in addition to those that reduce demand. Here, we examine the emissions implications of a supply-constraining measure that was rapidly gaining momentum in the United States (US) under the Obama administration: ceasing the issuance of new leases for fossil fuel extraction on federal lands and waters. Such a measure could reduce global carbon dioxide emissions by an estimated 280 million tons annually by 2030, comparable to that of other major climate policies adopted or considered by the Obama administration. Our findings suggest that measures to constrain fossil fuel supply—though not currently viable in a US Trump administration—deserve further consideration at subnational levels in the US or by other countries now, and by future US administrations. 相似文献