共查询到19条相似文献,搜索用时 234 毫秒
1.
2.
3.
本文根据大量实际资料,肯定了声波测井、伽(亻马)-伽(亻马)测井在检查固井质量方面的应用效果,并对有关问题作了讨论. 应用声波测井和伽(亻马)-伽(亻马)测井的方法来检查固井质量,已得到普遍的应用,取得了良好的效果. 相似文献
4.
5.
6.
7.
8.
9.
目前国内地磁台垂直分量磁变以的灵敏度都普遍偏低,不能适应一些研究工作的需要,必须予以适当的提高,本文在基本不改变仪器固有灵敏度的前提下,采取记录光线二次反射法,以提高仪器的记录灵敏度,利用这种方法既使仪器的灵敏度提高一倍同时又保证了仪器原有的稳定性。 相似文献
10.
流动地震数据采集器 ,除必须具备固定地震观测台站地震记录仪器相同的技术性能 ,如大动态范围、高分辨率外 ,还须具有野外流动观测的特殊性 :1高可靠性 .仪器必须能够在无人值守运行中长期稳定可靠工作 ;2强野外环境适应能力 .野外流动观测可能经常遭遇恶劣的工作环境 ,如潮湿、灰尘、环境温度等 ,仪器必须能够在各种野外恶劣环境下正常工作 ;3良好抗振性能 .仪器必须能够抵抗流动观测中的长途颠簸运输 ;4巨大数据存储能力 .地震观测数据量巨大 ,但野外流动观测数据收集困难 ,如何可靠存储和收集巨大的地震观测数据一直是困扰流动观测技术领… 相似文献
11.
1.前言在地方性微弱地震的观測中,通常总是采用高灵敏度电流計記录地震仪借照相紙感光方法进行記录。但是采用电流計記录方法有它的弱点:首先,仪器的放大特性,在向更高的放大倍数,較寬的頻率特性方向的改善,受到了种种技术条件(如磁鋼強度等)的限制。其次,在高灵敏度电流計記录地震仪中,摆与电流計間的耦合系数口σ2不得不做得很大,因之无論在仪器的理論分析或实际測定它的工作常数,都增加了困难。 相似文献
12.
阐述了熵平均法对地面γ能谱测量局部干扰的消除的基本原理和方法,应用此方法对浅覆盖区地质填图的γ能谱测量剖面数据及应用γ能谱测量确定古城墙位置的平面测量数据进行了处理,处理结果表明该方法对于消除地表植被及局部土壤元素富集随机干扰、突出弱异常具有明显的效果,使地质填图中进行岩性划分界线明显,考古中古城墙表现的弱异常突出,边界清晰.通过对熵平均法应用的讨论,可以看到5点熵平均对于局部干扰压制较多而对异常削弱较少的特点;与多点平滑相比,熵平均对于突跳点具有更好的压制作用.熵平均法对于地面γ能谱测量随机影响的消除起到了较好的效果,使地面γ能谱测量得到了较好的应用. 相似文献
13.
1.前言在地方性微弱地震的观測中,通常总是采用高灵敏度电流計記录地震仪借照相紙感光方法进行記录。但是采用电流計記录方法有它的弱点:首先,仪器的放大特性,在向更高的放大倍数,較寬的頻率特性方向的改善,受到了种种技术条件(如磁鋼強度等)的限制。其次,在高灵敏度电流計記录地震仪中,摆与电流計間的耦合系数口σ2不得不做得很大,因之无論在仪器的理論分析或实际測定它的工作常数,都增加了困难。 相似文献
14.
Torsten Bergmark 《Surveys in Geophysics》1984,6(3-4):381-391
A fluxgate magnetometer has been developed at the Geological Survey of Sweden. It measures the field in three orthogonal directions and has sensor elements forming bridges. The instrument can have direct readout in both digital and analogue form with a resolution of 0.1 nT.An instrument of this type has been adopted for stationary recording of geomagnetic elements in digital form. Special attention has been paid to insure good long term stability and high reliability. Experience from routine recording is described. 相似文献
15.
基线值是考察记录仪运行是否稳定可靠的一个重要指标。本文以记录仪的D分量为例,通过认真仔细地分析与探索,使用数据处理的方法,解决了崇明台FGE磁通门磁力仪基线值不稳定的问题。这对基线值的确定和日常的数据处理都具有一定的指导意义。 相似文献
16.
对六十年代生产的烟熏记录地震仪进行技术改造:保留烟熏记录,保留65摆(或DD—1摆)以ARA积分放大器代替线性放大器,以线性笔头代替积分记录笔,增配电子报警器及交直流自动切换电源,组成新的地震观测仪器系统。技术改造方案在广东地震台网实施、两年来仪器运行正常、效果很好。 相似文献
17.
Summary A new instrument has been designed for recording the horizontal components of tidal variations of the Earth's field of gravity and of tidal and non-tidal tilts of the Earth's crust. After justifying the use of the individual constructional elements, the functional model of the photo-electric compensating tiltmeter, constructing in the Geophysical Institute of the CSAS and installed at the tidal station in the Anna mine, Píbram, is described. Special attention is devoted to the sensitivity and recording azimuth of the tiltmeter and to the practical determination of these quantities. A high and constant sensitivity, the invariance of the recording azimuth and the possibility of simple automation of the whole evaluating procedure are the main advantages of the proposed instrument. In the conclusion some of the experience gained from test operations is discussed. 相似文献
18.
Broadband seismic networks are becoming more intensive, generating a large amount of data in the long-term collection process. When processing the data, the researchers rely almost on instrument response files to understand the information related to the instrument. Aiming at the process of instrument response recording and instrument response correction, we identify several sources of the instrument response phase error, including pole–zero change, the causality difference in instrument correction method, and the problem of filter coefficient recording. The data time offset range from the instrument response phase error is calculated from one sample point to several seconds using the ambient noise data recorded by multiple seismic stations. With different data delays, the time offset of the noise correlation function is estimated to be 74% to 99% of the data delay time. In addition, the influence of instrument response phase error on the measurement of seismic velocity change is analyzed by using ambient noise data with pole–zero change, and the results show that the abnormal wave velocity with exceeding the standard value is exactly in the time period of the instrument response error, which indicates that the instrument response error affects the study of seismology. 相似文献
19.
A contiuous recording instrument with field effect transistors has been developed to study the point discharge currents in the atmosphere. The chief advantages of the present instrument are that it is portable and has a range of measurement from 10–9 A to 10–7 A for positive currents and 10–9 A to 10–5 A for negative currents on a linear scale. 相似文献