length measurement

Research on Focal Depth in the Experiment of Thin Lens' Focal Length Measurement

薄透镜焦距测量实验中焦深问题的研究

The errors of intraocular lens power calculation may be caused by inaccurate axial length measurement or unstable keratometric reading.

造成人工水晶体度数计算之误差的主要因素为不正确眼轴长及角膜曲度之测量。

Conclusions: The formula calculation error and axial length measurement error were the main causes of postoperative refractive error. The axial length measurement error and formula calculation error increased with the axial length.

结论：公式计算误差和眼轴长度测量误差是导致术后眼屈光度误差的主要原因，且随着眼轴越长，眼轴长度测量误差越大，公式计算的误差也越大。

Based on these, a novel method for long focal length measurement is presented, which is achieved by calculating the angle of Moire fringes formed by Talbot image of one Ronchi grating and another Ronchi grating.

在此基础上，本文提出了通过Ronchi光栅的Talbot效应形成Moiré条纹，由Moiré条纹的转角来计算长焦距透镜焦距值的方法。

Through production field test, the length measurement scope is 6 to 15 meter, and length measurement precision is ± 1 mm.

经生产现场检验，该系统测长范围为6～15m，测长精度为±1mm。

The principle error of the TDR cable length measurement has also been analyzed. The influence of measuring numbers, counting pulse frequency and traveling wave velocity on measuring accuracy is analyzed.

分析了时域反射电缆测长的原理误差，研究了测量次数、计数脉冲频率、行波波速对测量精度的影响。

Using the longitudinal length measurement of long bones 、 histological methods 、 ECT and roentgenography, observe the influence of epiphyseal growth.

应用实体骨标本测量、组织学、ECT及X线照片等方法观察本方法对骨骺生长发育的影响。

Focal length measurement of concave mirror by holographic grating

全息光栅法测凹面反射镜焦距

Developing of on-line real-time workpiece length measurement system

在线实时工件测长系统开发

If the system is successfully developed, people can get a new kind of online length measurement equipment with more superior performance to continuous tubes.

该系统研制成功，可望获得一种新的性能更加优越的连续油管长度在线测量装置。

In another day or two, and increases the length measurement.

再功一两天丈量,长量又补充了.

In this paper, to avoid the current-contact measurement of the drawbacks, a laser Doppler Effect based on the non-contact cable length measurement is used.

本文针对现行接触式测量所存在的弊端，采用了一种基于激光多普勒效应的非接触式电缆长度测量方法。

The Analysis of Uncertainty in Thin Convex Lens's Focal Length Measurement

薄凸透镜焦距测量的不确定度分析

A Method of Wave Length Measurement Using the Isochromatic Spectrum

用等色谱测定光波波长

Focal length measurement of spherical lens using joint Fourier transform spectrum interference technique

利用联合付里叶变换谱干涉法测量透镜焦距

The adjusting error analysis of the focal length measurement using Fourier spectrum

用傅里叶频谱测量焦距的调整误差分析

It can be mounted on the Three-coordinate measurement machine or other length measurement machine like Interferometer to take measurement.

测头不仅可以安装在三坐标测量机上，也可以结合其它的测长仪如双频激光干涉仪进行表面形状测量。

Study of Focal Length Measurement of Fourier Lens

傅里叶透镜焦距测量的研究

Study of Focal Length Measurement of Fourier Lens With Spectral Analysis Method

频谱分析法测量傅里叶透镜焦距的研究

Test and Application of Indirect Side Length Measurement Made with the Total Station Instrument

全站仪间接测量边长的试验及应用

Considering a measurement example at PTB ′ s Precision Interferometer, the uncertainty of the individual length measurement is small enough so that the range of unambiguity is about 0.6 mm, i.e. a rough estimate of the length is sufficient for ultra precise length measurements.

PTB精密干涉仪长度测量不确定度很小，其单值性范围约0.6mm，因此其近似的长度估算足以满足超精密长度测量的要求。