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频率扫描
相关语句
  frequency sweeping
    Nondestructive Testing System of Alternative Magnetic Leakage Flux based on the Magnetic Field Measurement and the Frequency Sweeping Method
    基于场量测量和频率扫描技术的交变漏磁无损检测系统
短句来源
    The fast flaw-recognition model based on the magnetic field measurement and the depth-detection model based on the frequency sweeping method were built. Experimental results proved their accuracy.
    在对交变漏磁检测理论进行分析的基础上,提出了基于场量测量和频率扫描技术的快速识别和深度定量检测模型,并通过试验证明了该模型能实现表面缺陷的快速检测和缺陷深度的定量检测。
短句来源
  sweeping frequency
    Research on the Electromagnetic Non-destructive Testing Based on the Field Measurement and Sweeping Frequency Technique
    基于场量测量和频率扫描技术的电磁无损检测技术研究
短句来源
  “频率扫描”译为未确定词的双语例句
    Reserch of Crack Depth Measurement Based on Frequecy Scan Methods
    基于频率扫描技术的缺陷深度测量方法研究
短句来源
    Based on that penetration depth of eddy current is theoretically different for different operationalfrequency, the flaw depth quantitive measurement method based on the characteristicalfrequency was expounded.
    在利用频率扫描技术的基础上,提出了基于拐点频率的涡流检测缺陷深度测量方法,对影响测量的多种因素进行了分析和实验研究,得到了最佳的测试位置和测试方法,建立了拐点频率和缺陷深度的定量关系,为深度的测量提供了新的途径。 在国内首次对交变漏磁检测技术进行了研究。
短句来源
    This paper explains the principle of AOTF infrared spectral detecting system and completes the whole instrumentation. My thesis is described as three parts: ① Single chip microprocessor (SCM) controlled frequency auto-scanning, including keyboard, LCD display, SCM-PC communication, DDS-SCM interface circuit, control software for SCM.
    本文分析了AOTF红外光谱检测系统的原理并完成了对检测系统的仪器化,所完成的AOTF红外光谱检测系统的仪器化工作包括三个方面:①单片机控制下的基于直接数字频率合成技术(DDS)完成的自动频率扫描系统,包括键盘、液晶显示、单片机与PC机的串口通信、DDS与单片机接口电路、以及单片机控制软件;
短句来源
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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.
      
更多          
  frequency sweeping
Microwave pulses with different frequencies are obtained by frequency sweeping.
      
Frequency sweeping of emission from heterojunction quantum lasers with pump current modulation
      
Major features of frequency sweeping of emission from heterojunction quantum lasers
      
Laser frequency sweeping does not occur for low current modulation frequencies, corresponding to realization of the quasisteady-state lasing regime.
      
At large amplitudes, nonlinear interactions overwhelm the dissipation causing frequency sweeping and new modes to be excited.
      
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  sweeping frequency
We investigate, both experimentally and numerically, the local dynamics of the up- and down-switching process versus the sweeping frequency of the control parameter.
      
At high sweeping frequency, we show the appearance of another asymptotic scaling low in .
      
The performance of the bats depended on the temporal pattern of frequency change of the continuously sweeping frequency modulated (FM) component of the signals.
      
To establish rapid and sensitive on-line FFP analysis and to obtain reliable phase (i.e., latency) information we employed lock-in technique in recording frequency following responses on continuous, sweeping frequency stimulation (100-600 Hz).
      
By sweeping frequency around the resonance frequency of the transducer, in-phase and quadrature responses of the resonance were obtained from the output of the lock-in amplifier.
      
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A method of frequency spectrum analysis is introduced, which be realized by collect the virtual value of appoint frequency vibration through scanning frequency. It has been proved that this kind of frequency spectrum analytic approach has more merits and little expenses of memory and the circuit of hardware is simple, realization is convenient.

介绍了一种用频率扫描抽取指定频率振动分量有效值的方法实现硬件频谱分析的工作原理。实践证明这种频谱分析法具有占用内存小 ,硬件电路简单 ,实现方便的优点。

On the basis of some kind of methods to identify crack depth,the frequency scan method was applied in the alternative field measurement to give the information of depth of flaw.It was realized by use of the ratio which shows the percentage of the magnetic intensity to be character.This method was expounded and some results was explained for the other factors which effect the measurement of the crack depth.

在介绍多种无损检测方法对裂纹深度测量的基础上,提出了将频率扫描技术应用到交变磁场测量中,利用垂直工件表面的磁场强度在该点磁场强度中的比值作为特征量,实现对缺陷深度的测量的方法。对该测量方法进行了详尽的阐述,实验结果证明该方法可以实现对裂纹深度的测量。文中还对影响测量的多种因素进行了分析。

To detect and control the nanometer distance between the sample and the fiber tip is part of the key technology of NSOM system. Here a pizeo sensor with DDS is discussed. One of the sensor′s electrodes is separated into two like parts, one is for exciting the pizeo to shake and the other is for detecting the shake. The fiber tip is fixed on the pizeo and the pizeo is driven by a DDS. When the fiber tip is far from the sample surface, an exact resonant frequency of the fiber tip is obtained with the error of...

To detect and control the nanometer distance between the sample and the fiber tip is part of the key technology of NSOM system. Here a pizeo sensor with DDS is discussed. One of the sensor′s electrodes is separated into two like parts, one is for exciting the pizeo to shake and the other is for detecting the shake. The fiber tip is fixed on the pizeo and the pizeo is driven by a DDS. When the fiber tip is far from the sample surface, an exact resonant frequency of the fiber tip is obtained with the error of 0.006 Hz after frequency scanning, and when the tip is within the near-field of the sample, the resonant frequency of the fiber tip departures the resonant frequency in far-field, and the amplitude of the fiber tip obviously decreases because of the shear force between the fiber tip and the sample, and in this way the near-field distance is detected. The combination of high precision frequency source DDS and the pizeo sensor provides a higher sensitivity and stability of near-field detection.

近场扫描光学显微术中,近场距离的检测和控制是需要解决的核心技术之一 本文研究了基于DDS驱动的压电传感器,在一个压电陶瓷片上,电极被分成相同的两部分,分别用于振动驱动和振幅检测 近场扫描的光纤探针固定于此压电陶瓷片上 振动驱动信号采用DDS,在样品的远场时,可以通过频率扫描得到误差在0. 006Hz以内的压电陶瓷片谐振频率驱动信号,而当光纤探针处于样品的近场距离之内时,压电陶瓷片的谐振频率偏离驱动信号频率,振幅明显减小,从而检测出近场距离 高精度振动驱动源DDS和高灵敏度压电传感器的采用提高了检测灵敏度和工作稳定性。

 
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