数字式智能化锚索预应力传感器的研究与设计   总被引：4，自引：0，他引：4       下载免费PDF全文

胡时友王全成  姜昭群 《探矿工程》2001,(2):30-33

预应力传感器是锚固工程，预应力混凝土工程，预应力桥梁工程等领域进行监测，研究与试验必不可少的测量用传感器，在分析预应力传感器[研究现状的基础上，详细了介绍了数字式智能化锚索预应力传感器的工作原理，结论设计，计量检定结果，主要特点和应用情况。  相似文献   

水文水井抽水试验参数自动监测系统硬件设计   总被引：1，自引：0，他引：1       下载免费PDF全文

龚元明胡郁乐  吴翔王培玉  王建国杨增斌 《探矿工程》2001,(5):16-18

设计了以单片机为核心的抽水试验参数自动监测系统，能自动完成水位、出水量、地下水温和承压水水头高度等主要参数的自动监测，并现场打印数据；能和PC机进行数据通讯，转储数据，通过PC机进行进一步数据处理，输出打印S＝f(t)和Q＝f(t)曲线，建立数据库。  相似文献   

VARIABILITY OF AEROSOL OPTICAL PROPERTIES OVER HEFEI DURING SEPTEMBER 1993 TO SEPTEMBER 1994   总被引：7，自引：0，他引：7       下载免费PDF全文

Zhou Jun  Wang Zhi''en  Han Jiecai  Hu Huanling  Li Guojie 《Acta Meteorologica Sinica》1996,10(1):81-95

An 8-wavelength sun-photometer has been operated at Hefei (31.31°N, 117.17°E) to monitoroptical properties of atmospheric aerosols. Altogether 133 solar spectral extinction data were ob-tained on clear days during the period from September 1993 through September 1994, In this pa-per, the feature of the sun-photometer is briefly described. A relative aureole method is intro-duced. which can be used to monitor temporal evolution of aerosol loading during the sun-pho-tometer calibration period. Temporal variabilities of spectral aerosol optical depths and Angstromturbidity parameters are presented. Relation of these variabilities with synoptic and local meteoro-logical conditions are analyzed and discussed, From measured spectral aerosol optical depths undersome representative atmospheric conditions, columnar aerosol size distributions have been retrievedby a linearly constrained inversion method. These typical columnar aerosol size distributions are al-so presented and discussed.  相似文献   

光学转像变倍微分方程的建立及其应用     

林银森  何平安  余模智  林荔 《武汉大学学报(信息科学版)》1996,(4)

建立了光学转像变倍微分方程，并应用于军械瞄准具无焦系统连续变倍过程的分析，给出两个数字例子的高斯光学设计结果  相似文献   

兰州冬季气溶胶光学特性的参数化   总被引：9，自引：1，他引：9  

田文寿  陈长和 《大气科学》1996,20(2):235-242

兰州冬季气溶胶的谱分布用双谱模式拟合，即Junge谱加Deirmendjian谱；气溶胶的平均折射率为1.549-0.1i；气溶胶浓度随高度的分布根据天气条件取为高斯、均匀、指数分布三种类型。以此为基础，计算出兰州冬季气溶胶光学厚度的平均值。 经实测的气溶胶光学厚度与本文的计算值比较后发现，我们的参数化方案基本上是成功的。  相似文献   

A novel ozone sensor for direct eddy flux measurements     

Hans Güsten  Günther Heinrich  Ralf W. H. Schmidt  Ulrich Schurath 《Journal of Atmospheric Chemistry》1992,14(1-4):73-84

A small, lightweight (1.5 kg) and fast-response ozone sensor for direct eddy flux measurements has been built. The basis for detection is the chemiluminescence of an organic dye adsorbed on dry silica gel in the reaction with ozone. The chemiluminescence is monitored with a cheap and small blue-sensitive photomultiplier. At a flow rate of 100 l min^-1 the ozone sensor has a 90% response time of significantly better than 0.1 s with a detection limit lower than 50 ppt at S/N=3. There are no interferences from other atmospheric trace gases like NO_x, H₂O₂ and PAN. Water vapour and SO₂ enhance the chemiluminescence efficiency of the ozone sensor. Since their response times are 22 seconds and 30 minutes, respectively, no correlation between rapid ozone fluctuations and those of these two trace gases is noticed by the ozone sensor when operating at a frequency of 10 Hz.The ozone sensor was tested for several weeks in continuous measurements of ozone fluxes and deposition velocities over different croplands using the eddy correlation technique. Good agreement was found between ozone dry deposition velocities derived from profile measurements and by eddy correlation.  相似文献   

一个世界最早光象分类体系的探讨——复原先秦“十煇”的研究     

王鹏飞 《南京气象学院学报》1992,(2)

《周礼》十煇为世界最早的光象分类体系。其含义历来众说纷纭。有探讨、重建并评价的必要。本文比照历史上有影响的五家十煇定义,分析其含糊矛盾之处,提出复原十煇原义的三条原则,从而重建了十煇原义表,介绍了古代观测十煇的方法。最后对《周礼》十煇这个光象分类体系进行了评价。  相似文献   

自聚焦光纤中传导模的场分布     

翁兴涛  余模智  何平安 《武汉大学学报(信息科学版)》1995,(4)

从亥姆霍兹方程出发，导出了自聚焦光纤中传导模在圆柱坐标系中的场分布形式，并给出了几个低阶模的分布图。  相似文献   

光轴角近90°时二轴晶光性正负的判别     

徐济银  杲传良 《岩石矿物学杂志》1995,14(4):371-375

二轴晶光率体光性正负有两种判别方法：一种是根据光轴角（２Ｖ）的锐角平分线（Ｂｘａ）与Ｎｇ一致还是与Ｎｐ一致来判别，其临界点是２ｙ＝９０°；另一种是根据三个主拆射率的相对大小来判别．由于二轴晶光率体为三轴椭球体，在其临界点Ｎｇ一Ｎｍ＝Ｎｍ一Ｎｐ时，光轴角并不等于９０°。就是说，两种判别方法的临界点不一致。本文从光率体几何特性研究入手，通过几何及数学方法，着重讨论上述两种判别方法在其临界点时的相对关系，并结合实际例证，认为二轴晶光率体光性正负的临界点不能只确定为一个点，而应限定在一个范围，即２Ｖ＝９０°到Ｎｇ－Ｎｍ＝Ｎｍ－Ｎｐ之间。  相似文献   

Remote structural health monitoring with serially multiplexed fiber optic acoustic emission sensors     

陈仲裕  梁玉进  Farhad Ansari 《地震工程与工程振动(英文版)》2003,2(1):141-146

Development and testing of a serially multiplexed fiber optic sensor system is described. The sensor differs from conventional fiber optic acoustic systems, as it is capable of sensing AE emissions at several points along the length of a single fiber. Multiplexing provides for single channel detection of cracks and their locations in large structural systems. An algorithm was developed for signal recognition and tagging of the AE waveforms for detection of crack locations. Laboratory experiments on plain concrete beams and post-tensioned FRP tendons were performed to evaluate the crack detection capability of the sensor system. The acoustic emission sensor was able to detect initiation, growth and location of the cracks in concrete as well as in the FRP tendons. The AE system is potentially suitable for applications involving health monitoring of structures following an earthquake Supported by: National Science Foundation, Grant number CMS-9900338  相似文献