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本文讨论了数字水准仪分辨率及测试的相关概念及方法，提出了利用光学测微器进行分辨率测试的新方案，给出了初步测试结果并设计出测试数字水准仪分辨率的测微器。 相似文献
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本文给出了一种同时适用于光学水准仪和数字水准仪的编码方法。利用该编码方法,只需要在数字水准仪上加载一与标准码宽度相匹配的光学测微器,即可实现光学水准仪和数字水准仪的一体化。数字光学一体化水准仪不仅原理新颖,而且同时具有光学水准仪和数字水准仪的优点,给使用者带来极大方便。作者提出用内插法计算视距。 相似文献
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平行平面玻璃测微器是精密水准仪的重要组成部件。水准仪是外业仪器，因此测微器结构也必需简单轻巧。采用的结构必然是误差结构，从而必然带有非线性误差。这种误差在远程线水准中将产生重大影响。按照数理统计的观点，仪器的系统误差与偶然误差的比值不得大于1/20。计算器得到普遍使用的条件下使得设计工作变的简单。本文将叙述新设计工作的步骤。 相似文献
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煤炭开采引起的地面沉降区沉降周期长、范围大,造成的环境危害也日益显著,如何高效、准确地为矿区环境治理提供基础资料成为工作人员的当务之急。本文利用DiNi03电子水准仪对马莲台煤矿采矿区地面进行沉降监测,详细介绍了电子水准仪在沉降监测中的工作优点和技术方法,并且对测量数据进行了分析,提出了一些方法和建议,为因煤炭资源开发造成的地面沉降等灾害的基础资料获取提供技术参考。 相似文献
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当前电子水准仪采用传统的串口有线通信方式,在外业测量中存在磨损大、操作不便、工作效率低等问题,将对电子水准仪数据传输效果和项目的顺利实施造成较大影响。利用蓝牙技术实现了电子水准仪与掌上电脑之间数据的无线传输通信,以无线代替有线数据采集方式,使得电子水准仪能在野外可移动地、方便灵活地采集数据,具有一定的实用价值。 相似文献
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本文主要论述常用的水准仪在室内的无标准平行光管的校准方法,主要是利用水准仪的水平自然标准进行校正,可以多台同时进行,方法简单易行,精度较高,完全可以满足实际需要。 相似文献
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大地测量是一门古老的科学。从十九世纪中叶到二十世纪五十年代以前,大地测量的理论和方法没有什么重大的发展,只有在各种观测仪器方面有了一些改进。例如发展了光学经纬仪、光学测距装置、和平行玻璃板测微器的精密水准仪,应用殷钢基线尺代替杆状基线尺测量基线,应用光干涉法检定基线尺,制成了重力仪代替摆仪测定重力加速度等等。 相似文献
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利用天宝Di Ni03数字水准仪和徕卡NA2精密光学水准仪进行精密水准测量对比试验,比较分析两种不同观测模式下的测量成果及其精度状况,探究数字水准仪Di Ni03水准测量系统数据处理方法及内置平差软件性能的优劣,为实际工作中水准测量仪器和数据处理方法的选择提供参考。 相似文献
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《测量评论》2013,45(55):26-27
AbstractEvery student of Close and Winterbotham's “Text Book of Topographical Surveying” learns that rewebbing diaphragms is a simple job. Unfortunately, when circumstances compel a surveyor to reweb a micrometer diaphragm in the field, he is liable to find, after some years in the tropics, that fever (and one thing and another) have played havoc with the steadiness of hand and eye. Under present conditions young surveyors who have been trained on optical micrometers may find themselves using 5″ micrometer theodolites with over a dozen webs, anyone of which is liable to sag, break or develop whiskers, while even a “Tavi” may conceivably remind the user that it has one web. 相似文献
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《测量评论》2013,45(37):429-436
AbstractGauss's method of collimation is usually given scant attention in survey text-books. The following notes are based on experiments carried out at Accra in making a collimation base, the collimator being a Watts 2I-inch self-adjusting level fitted with a parallelplate micrometer. 相似文献
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地面雷达是一种基于微波干涉测量的变形监测设备,具有高精度、高分辨率的监测优势,本文讨论了地面雷达的技术原理和数据处理流程,介绍了微变形监测系统,并进行了位移监测的对比试验,将微变形监测系统与TCA 2003、千分表的位移监测数据进行对比.试验数据分析结果证明:地面雷达具有高精度的位移监测能力. 相似文献
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《测量评论》2013,45(27):269-272
AbstractThe last issue (No. 26) of the Review contained an article on “Observing with the Zeiss and Wild Theodolites”, making reference among other matters to the errors of the parallel-plate micrometer. The statement was made that the error was due to the difference in travel between the two plates. This is not strictly correct but could not be better expressed without additional explanation, out of place in an already overlong article. 相似文献
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Abstract Azimuth.—The method was that of star altitudes in the prime vertical, except at X. 34 where hour angles on the P.V. were observed. At B.P. 79 and 99, NE. Terminal, and X. 12 and 34, the measures were made by Major Godfrey-Faussett or Capt. Taylor with the 8-inch C.T. & S. micrometer theodolite; and at all other stations by Capt. Taylor with the Tavistock theodolite Y. 2304. 相似文献
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N. K. Patel T. P. Singh R. R. Navalgund Baldev Sahai 《Journal of the Indian Society of Remote Sensing》1982,10(1):27-34
One of the important parameters affecting crop yield is the availability of soil moisture to the crop. Lack of it may bring about moisture stress in plants which manifests itself in terms of changes in the spectral reflectance and emittance properties of plants. An experiment involving radiometric measurements over six wheat plots subjected to different irrigation schedules was conducted to test this hypothesis. Vegetation index defined in terms of crop reflectances in 0.6 to 0.7 and 0.8 to 1,1 micrometer bands was found to be a sensitive parameter to distinguish normal plants from moisture-stressed plants. The optimum period for the discrimination of such plants through remote sensing techniques has been indicated to be 45–80 days after sowing. The experiment also demonstrates that yield per unit area is linearly related to the maximum leaf-area index of the crop thus providing a possible method of crop yield prediction. 相似文献
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W. W. Carson 《The Photogrammetric Record》1985,11(65):525-541
This paper discusses an inexpensive, analytical system designed for a forestry application of photogrammetry. It is presented in two parts. Part I describes an image space plotter that was built in New Zealand and is operating there. The system uses a digitising table to collect left-hand photograph co-ordinates. an encoded micrometer bar to measure × parallax and a mirror stereoscope for viewing photographs. The mathematical, formulation is based on simplifications first suggested by E. H. Thompson. Good accuracy in ground heights can be achieved by the system, but only poor accuracy in planimetric co-ordinates. The cause of poor planimetric accuracy is investigated in Part II. Two error sources are apparent: the simplified analytical theory and systematic errors from the digitising table. Part II also investigates the relationship between random errors in image co-ordinate measurements and system accuracy. 相似文献
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多通道辐射计在0·4—2.5μm设置了6个通道,可以以TM,MSS或其它通道工作。仪器的视场和工作通道均可在测量现场迅速更换。机内微处理机自动记录、处理、打印(传送)测量数据。整个系统由电池供电,适于在直升机、车辆、三角架等平台上操作,也可以手持式操作。 仪器具有操作、维修简单,维护费用低,测量速度快,具有较丰富的数据处理和交换功能等特点。 文中还介绍了仪器的一些应用情况和部分结果。 相似文献