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频率扫描
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  frequency scan
    Two novel depth-domain frequency spectrum analysis methods for logging data have been developed, which are depth-domain frequency scan and moving-window frequency spectrum analysis.
    本文在前人研究的基础上提出了两种基于测井资料的深度域频谱分析方法──深度域频率扫描和滑动窗频谱分析。
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  frequency scanning
    (2)Prototype struclural test was carried out on the large scale shaking table. Natural vibration behavior and damping ratio of the structure were obtained with frequency scanning and parameter identification.
    (2) 在大型振动台上进行原型结构试验,通过频率扫描得到结构的自振特性,同时通过物理参数识别求出结构阻尼比。
短句来源
    Q scan,a qualita- tive analysis method,is analogous to velocity scanning or frequency scanning.
    前者类似于速度扫描或频率扫描,属于一种定性分析方法;
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  frequency scan
The high resolution spectra are measured tuning the length of a CO2 waveguide laser by means of a PZT yielding a frequency scan of 230 MHz around the CO2 laser lines.
      
Our frequency scan data, as well as our data for the time course of resistance and capacitance, show that the fast change is associated with both the under-the-cells and between-the-cells resistance.
      
The high sensitivity of the intracavity arrangement allowed very strong double-resonance and two-photon transition signals to be observed with high microwave-frequency scan-rates (1 GHz/min), and low microwave pumping powers (≦10mW/cm2).
      
In this way an idler frequency scan of 100-150?GHz could be obtained, after which the signal frequency hops ahead over the FSR of the intracavity etalon of the OPO (207?GHz).
      
Low noise, mode-by-mode absorption spectra are recorded at a high acquisition rate (laser frequency scan greater than 400?GHz/s) and covering four orders of magnitude in absorption coefficient.
      
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  frequency scanning
In the second case, the Brewster reflection conditions are not realized, and the variations in the intensity of the reflected light observed upon frequency scanning are smaller.
      
A diplexer of this type can be used for discrete frequency scanning of high-power wave beams in systems for the suppression of the hydrodynamic instabilities of plasma in magnetic traps.
      
Amorphous carbon films were examined by low frequency scanning-probe acoustic microscopy (LF-SPAM).
      
Our results showed that the low frequency scanning-probe acoustic microscopy is a useful method for imaging subsurface defects with high resolution.
      
Frequency scanning of the laser is provided by acoustooptic modulation.
      
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Inverse Q filtering is a technique for compensating the earth atten- uation.It can not only compensate amplitude and frequency but also ameliorate phase characters of seismic data.Many people believe that Futterman model can quite well describe seismic wave attenuation caused by the earth.On the basis of Futterman model,inverse Q filtering oper- ator can be derived using Hilbert transform.On the one hand,inve- rse Q filtering is similar to deconvolution in compensating the attenua- tion;on the other hand,inverse...

Inverse Q filtering is a technique for compensating the earth atten- uation.It can not only compensate amplitude and frequency but also ameliorate phase characters of seismic data.Many people believe that Futterman model can quite well describe seismic wave attenuation caused by the earth.On the basis of Futterman model,inverse Q filtering oper- ator can be derived using Hilbert transform.On the one hand,inve- rse Q filtering is similar to deconvolution in compensating the attenua- tion;on the other hand,inverse Q filtering is different from decon- volution because inverse Q filtering is uniformly time-varying and its algorithm is not influenced by noise.The earth quality factor Q is usually obtained using Q scan and spectrum analysis.Q scan,a qualita- tive analysis method,is analogous to velocity scanning or frequency scanning.The spectrum analysis is a quantitative estimation method, that is to say,using least square method,the spectrum attenuation ten- dency is fitted into a straight line,whose slope,being directly pro- portional to 1/Q,is just the ratio of amplitude attenuation to frequen- cy increment.In order to ensure the accuracy of Q,we neither make deconvolution before stack nor perform gain control and filtering af- ter stack.Of course,Q accuracy is also related to seismic data quality and window length.Experiments show that inverse Q filtering favours the improvement of weak reflections,resolution and lateral continua- tion.

反 Q 滤波是一种补偿大地衰减效应的技术,它不仅可在振幅和频率两方面进行补偿,而且可以改善记录的相位特性。多数人认为 Futterman 模型可以较好地描述大地对地震波的衰减过程,以此为基础,利用希尔伯特变换可以得到反 Q 滤波因子。就补偿衰减作用而言,反 Q 滤波类似于反褶积,但它和反褶积是有区别的,这表现在反 Q 滤波是均匀时变的,算法也不受噪声影响。一般求反 Q 滤波中的大地品质因子 Q 值采用 Q 扫描和谱分析两种方法。前者类似于速度扫描或频率扫描,属于一种定性分析方法;后者是一种定量估算方法,采用最小二乘法对谱的衰减趋势拟合为一直线,振幅衰减的变化量和频率的变化量的比值,恰为所拟直线的斜率,此斜率与 Q 的倒数成正比。为了保证 Q 值估算的精度,在叠前不作反褶积处理,在叠后不作增益和滤波处理。当然,Q 值计算精度和资料品质、时窗长度都有关系。试验表明,反 Q 滤波对提高弱反射能量、提高分辨率和增强连续性都是有利的。

There are various types of sand dunes in Drungar Basin, distributed in a vast area of desert. Especially, in the central part of the basin, many huge sand dunes of closed shape or with North-south orientation form the worst relief in desert areas.

在准噶尔盆地内分布着多种类型的沙漠,它们占据了盆地中大部分的面积。沙漠区的中部、中南部的蜂窝状沙丘及南北向的大沙垄的地形条件最坏,使地震资料的质量受到影响。为了在此困难的地区内改进反射波法地震勘探的效果,在过去几年中进行了很多试验,取得了一定的效果.后来又在以往的测线上,采取了强化野外方法的措施,并用可控震源与炸药震源进行比较,取得了有意义的结果。进一步根据频率波数域振幅谱的分析,研究了干扰波的特征,并采取相应的二维滤波以消除干扰。同时,在频率域对叠加后的剖面进行频率扫描分析,对深层反射的低频特点的认识比以往深入一步,从而提示我们今后要在更低、更宽通频带的记录上研究它们。

Depth-domain frequency spectrum analysis method for logging data means to analyse, on the basis of Fourier transform, not only the frequency spectrum character of logging data but also the relation between it and high frequency sequence so as to ascertain high frequency sequence. Two novel depth-domain frequency spectrum analysis methods for logging data have been developed, which are depth-domain frequency scan and moving-window frequency spectrum analysis. These methods have achieved good effect in sequence...

Depth-domain frequency spectrum analysis method for logging data means to analyse, on the basis of Fourier transform, not only the frequency spectrum character of logging data but also the relation between it and high frequency sequence so as to ascertain high frequency sequence. Two novel depth-domain frequency spectrum analysis methods for logging data have been developed, which are depth-domain frequency scan and moving-window frequency spectrum analysis. These methods have achieved good effect in sequence stratigraphy research in Anan depression.

测井资料的深度域频谱分析方法是指在傅里叶交换基础上研究测井资料的频谱信息特征及其与高频层序的关系,以用于层序地层学研究中的高频层序划分。本文在前人研究的基础上提出了两种基于测井资料的深度域频谱分析方法──深度域频率扫描和滑动窗频谱分析。该项技术已在阿南凹陷层序地层学研究中取得了良好的效果。

 
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