TRES-Ⅰ型多分量瑞利波勘探仪的研究及应用     

李锦飞 《物探与化探》1998,22(2):129-133

提出多分量瑞利波勘探的技术思想和方法,研制成功专用的防爆型多分量瑞利波勘探仪器,建立了在用极化分析对瑞利波勘探记录的多分量信号分析的基础上,用极化滤波提取有效瑞利波信号的方法。在煤矿井下及地面实际应用表明,多分量瑞利波勘探与单分量法比较,信号的信噪比、勘探深度和可靠性均有一定的提高。  相似文献   

Intercomparison of New Zealand filter ozonometer and Dobson spectrophotometer total ozone measurements     

H. Müller  R. Reiter 《Pure and Applied Geophysics》1980,118(2):847-857

A commercial version of the prototype New Zealand narrowband interference filter instrument has been run at Garmisch-Partenkirchen since autumn 1977. The vicinity of the Dobson stations Hohenpeissenberg and Arosa permitted a check of the filter instrument's utility, reliability and long-term stability in total ozone measurement by (i) station to station-or short-range intercomparisons of daily means and (ii) a several days' direct intercomparison at Arosa in spring 1978.The regression analysis with the Hohenpeissenberg data-covering the five month autumn-winter 1977/78 period with highly variable ozone-shows that the filter instrument's direct-sun modeX _AD total ozone values were systematically too low by a conversion factor of 0.93. The excellent proportionality between the instruments is indicated by the standard deviation of only 1,3%. The (–7.0±1.3%) bias perfectly agrees with the result reported byBasher [1] for a similar, yet direct, intercomparison.During the direct Arosa intercomparison the filter instrument also tracked down short-time variations in a remarkable, though biased, parallelism with the Dobson instruments, and theX _AD daily means fit well into the prognostic relationship derived from the preceding autumn-winter short-range intercomparison.A creeping deterioration of the characteristics of the 305.5 nm double filter then prevented any furtherX _AD total ozone intercomparison. No final decision is possible whether this behaviour after a half year's run is typical or just an unusual exception. The otherwise excellent long-term stability is demonstrated by the comparison of theX _CD daily means with the HohenpeissenbergX _AD data for a 1 1/2 year's period (autumn 1977–spring 1979), resulting in the same bias relationship as for theX _AD total ozone measurements.  相似文献   

关于太阳厘米-分米波段频谱日像仪研究进展   总被引：4，自引：4，他引：0  

颜毅华  张坚  陈志军  姬国枢  王威  刘飞 《天文研究与技术》2006,3(2):91-98

摘要：在无线电波段进行射电观测是研究太阳的一个十分重要的手段，不同波段的无线电波反映出不同的特性和状态，其辐射频率与环境参数密切相关。当探测出某一频率上的无线电辐射后，即可诊断源区的电子密度或磁场。因此，建设厘米-分米波段频谱日像仪将首次在该波段上实现同时以高空间、高时间和高频率分辨率观测太阳活动的动力学性质，探测日冕大气。对于太阳物理研究具有重要作用。本文介绍该项目的科学意义、技术方案及预研进展情况。  相似文献   

Geophysical Model Function for Wind Speed Retrieval from SARAL/AltiKa     

R. M. Gairola  M. T. Bushair  Suchandra Aich Bhowmick 《Marine Geodesy》2015,38(3):409-421

With the launch of SARAL/AltiKa altimeter, efforts have been made to develop wind speed retrieval algorithms. Here we present two algorithms for estimating and validating wind speed from AltiKa. The first method is based on a theoretical Geophysical Model Function (GMF) using forward model simulations for Ka band specifications. The second is the model function developed using the matched database of input and output vectors of Normalized Radar Cross Section (NRCS) from AltiKa and wind speed measurements from concurrent Jason-2 altimeters. Since the NRCS depends on both the surface roughness due to surface wind speed and on mean square slope of the surfaces, the significant wave height is used along with wind speed for model development as an proxy variable. Both the theoretical and empirical GMFs are evaluated for retrieval of wind speed from AltiKa and validated with NDBC buoys data. The empirical model provide wind speed retrieval accuracy of 1.4 m/s. The accuracy of wind retrievals from theoretical model is also in the similar range (1.6 m/s), indicating the sound physical basis applicable for the future altimeters with various incidence angles. The retrieved wind speed is applied for various case studies, bringing out all the regional and global features quite well.  相似文献   

海洋监测设备动力环境实验室信息管理系统的构建     

王花梅  路宽  田强 《海洋技术学报》2015,34(4):15-21

实验室信息管理系统(LIMS)为实验室提供了便捷、准确、及时、规范的技术服务,已经被越来越多的实验室认可与应用。针对海洋监测设备动力环境实验室的实验业务与信息管理,分别从业务流程、用户需求和功能需求进行了分析,并对系统功能进行了详细设计。系统由基础设施层、数据层、支撑功能层、业务系统、标准规范支撑体系与信息安全支撑体系六部分组成,分为对外和对内两个应用部分,根据不同用户的不同权限,对实验室信息、实验数据、设备数据以及新闻等信息分别有不同的权限。该系统能够满足实验人员、管理人员与一般用户的不同需求,实现了对海洋监测设备动力环境实验室信息、实验数据与实验资源的有效管理,提高了仪器设备预约效率,实现了测试仪器装置的最大程度共享,节省了人力、物力和财力,同时,便于仪器设备的维修与维护与用户快速获得实验室各类信息。  相似文献   

虚拟仪器在天气雷达发射机脉冲测试中的应用     

范凯波  高玉春  梁丽 《气象科技》2015,43(5):783-787

随着我国新一代天气雷达（CINRAD）的广泛布网,雷达的维修维护工作显得日益繁重。利用虚拟仪器测试系统对雷达重要参数指标测试是一种便捷有效的方式。本文从发射机射频脉冲包络以及其测量方法的介绍出发,搭建一套基于PXI(PCI eXtensions for Instrumentation)模块化仪器的虚拟仪器系统,采用LabVIEW(Laboratory Virtual Instrument Engineering Workbench)软件编程实现参数测试测量功能,通过实验完成了对脉冲包络的重要参数测试。虚拟仪器测试系统与传统仪器对比测量结果,验证了该测试系统的可靠性。  相似文献   

探测仪器特性曲线异常分析     

敬颖  闵锦忠  刘立辉  吴恒  徐爽 《气象科技》2015,43(4):601-606

探测仪器感应曲线发生变化,造成升速异常、等压面的温度、湿度错误、雷达〖CD*2〗气压高差偏大、时间〖CD*2〗高度线曲变化异常造成的规定高度上的风误差偏大,使部分资料或整份资料失真,影响探测准确性。本文主要从仪器的感应曲线变化后对各气象要素产生的影响进行分析,得出结论：不同的元件变性对气象要素产生的影响不同,气压变化的影响侧重于高差和升速,温度变化则侧重于规定等压面的温度绝对误差和规定等压面高度的偏差。采用绝对误差计算、加密气象要素计算等方法,结合图形、数据对比,可以确定感应曲线变化时间,从而及时、有效的对探测数据做出合适的处理,进一步提高探测数据的精准度。  相似文献   

船舶自动气象站分类标准及仪器布设原则     

张玉洁  安忠亮  高林  涂爱琴  宋传经 《山东气象》2015,35(3):40-43

本文在研究分析各类船舶的基础上,对船舶自动气象站(船舶站)的基本构成和采集要素进行了分类,提出了船舶站构成的分类标准,解决了不同船舶选取安装不同要素自动站选择依据不足的问题,详述了船舶站的构成。以典型船舶站为例,详述了温、压、湿、风、降水、能见度、辐射等观测要素的安装位置选择,为船舶站的设计和安装提供参考依据。  相似文献   

Detection of nitric acid (HNO<Subscript>3</Subscript>) in the atmosphere using the LOPAP technique   总被引：1，自引：0，他引：1  

Jörg Kleffmann  Traian Gavriloaiei  Yasin Elshorbany  Milagros Ródenas  Peter Wiesen 《Journal of Atmospheric Chemistry》2007,58(2):131-149

A new instrument (LOPAP: LOng Path liquid Absorption Photometer) for the sensitive detection of nitric acid (HNO₃) in the atmosphere is described. HNO₃ is sampled in a temperature controlled stripping coil mounted in an external sampling module to minimize sampling artefacts in sampling lines. After conversion into a strongly absorbing dye, HNO₃ is detected in long path absorption in special Teflon® AF 2400 tubes used as liquid core wave guides. For the correction of some interferences, due to for example HONO and particle nitrate, two channels are used in series. The interferences from several potential interfering compounds including particle nitrate were quantified in the laboratory and in a large outdoor simulation chamber. With the exception of the interference caused by N₂O₅, which is quantitatively measured by the instrument, all tested interferences can be corrected under atmospheric conditions. Thus, in the instrument only the sum of N(V) from HNO₃ and N₂O₅ is determined, which is expected to be a common problem of wet chemical HNO₃ instruments. The instrument has a detection limit of 5–30 pptv for a time response of 6–2 min, respectively and was validated against the FTIR technique in a large outdoor simulation chamber. In addition, the applicability of the instrument was demonstrated in a field campaign.  相似文献   

一种程控宽频带多波形信号发生器的研制     

胡仕兵  赵敏智王　波 《成都信息工程学院学报》2014,(1):33-38

针对目前专门的函数信号发生器IC功能简单、精度不高、调节方式不灵活等缺点和DDS芯片外围电路设计复杂、成本较高等问题,设计研制了一种程控宽频带多波形信号发生器。该信号发生器采用单片机STC89C52控制专用函数发生器MAX038实现,通过键盘设置输出波形类型、频率、占空比和幅度等各种参数,采用闭环控制方法对输出频率自动反馈控制以提高频率精度,并由八位LED显示器实时显示状态信息。实际运行结果表明:该系统可以产生频率范围在1Hz~20MHz、幅度在2~10V(VPP)连续可调、占空比在10%~90%变化的三角波、锯齿波、方波、正弦波和PWM波,输出频率精度小于0.01%。该仪器具有电路结构简单、性能优良、成本低廉、功能多样、使用方便等优点,在生产实践和科技研究领域中具有广泛的应用前景。  相似文献