查询词典 accuracy of measurement

To investigate high-accuracy frequency measurement,the measurement error of the phase detection method is analyzed.

针对高精度的频率测量，分析了相位检测法的测量误差，根据分析结果提出并实现了一种基于FP-GA实现的频率测量方法。

In order to realize quick,nondestructive and automatic measurement of the surface roughness of high accuracy gauge block,a surface roughness measurement system based on interference image processing is studied out.

为实现高精度量块表面粗糙度的快速、无损伤、自动化检测，研制了一套基于干涉图像处理的表面粗糙度检测系统。

But at the present time, there is not the method which is used to measure the concentration of hydrogen nitrate ion in solution with high speed, high measurement precision and high measurement accuracy.

但是目前还没有针对溶液中硝酸根离子浓度的成形的高速度、高精度、高准确度的检测方法和仪器。

aining at high impedance weak signal measurement,the relations among measuring precision,input impedance and input bias current,the guard technology is applied to design a measuring circuit with guard circuit,adding a guard potential to low-impedance nodes of circuit,the effect of leakage current is reduced.using spice simulation and validates that guard circuit can increase the input impedance of the system and lower the input bias current,the results show that the guard circuit provids a valuable solution for high accuracy measurement of the high impedance weak signal.

摘 要：针对高阻抗微弱信号测量问题，对测量精度与系统输入阻抗、输入偏置电流的关系进行分析，应用保护技术设计了带保护电路的测量电路，将电路中的低阻抗节点加上保护电势，减小漏电流的影响。通过pspice仿真分析，验证保护电路能提高测量系统的输入阻抗和降低输入偏置电流，结果表明保护电路技术能实现对高阻抗微弱信号的高精度测量。

The effect on temperature measurement accuracy was analyzed by mechanical modulating disk in the real-time temperature measurement system using lasers InGaAs/I and pyroelectric detector LiYaO-3 based on Kirchhoff law.

分析了一种基于基尔霍夫定律的钽酸锂(LiTaO3)热释电探测器作为接收元件的实时测温系统中，机械式调制盘对测量精度影响，提出了改变机械式调制盘对测量精度的影响的方法；介绍了液晶调制器的结构、对辐射调制的原理以及在使用过程中的优点。

According to the observation experiment at the Jiufeng station where there is smaller environment noise, the conclusions are drawn as follows.In the normal atmosphere, the observed value is about 500×10-5ms-2, which is greater than theoretical value about 30×10-5ms-2, and if in the low vacuum, the observational error about 2.3×10-5ms-2 is generated. The vacuum maintaining system in falling room can not work normally, which will yield 0.1~4.1×10-5ms-2 error to the gravimetric observation. In the case of that the measurement is in the stable geological conditions and the smaller environment noise, the action of vibration isolating spring is not obvious, but it yields greater effects on measurement accuracy.

通过在环境干扰较小的九峰站观测实验，得到如下结论：在正常大气压状态下所观测到的空气阻力影响约500×10-5ms-2，比理论估算值大近30×10-5ms-2，若在低真空状态测量空气阻力也将产生2.3×10-5ms-2观测误差；落体室真空度维持系统工作不正常，空气阻力也将对重力观测造成0.1~4.1×10-5ms-2的观测误差；在地质条件比较稳定，环境震动干扰较小的基墩上测量，隔震弹簧的作用对观测结果影响不明显，但对测量精度影响较大。

This results in a quasi-heterodyne measurement mode, which increases the measurement accuracy of optical path difference.

实验验证了该方法的可行性，并讨论了影响小角度测量精度的误差因素。

The phase of interference signal is modulated in time domain by sinusoidally changing the injection current of a laser diode. This results in a quasi-heterodyne measurement mode, which increases the measurement accuracy of optical path difference.

通过正弦地改变半导体激光器的注入电流在时域内实现对干涉信号的相位调制，形成准外差干涉测量模式，提高了光程差的测量精度。

The results show that the optical system can satisfy the demand of measurement range and measurement accuracy.

结果表明，所设计的光学系统能够较好地满足测量范围和测量精度的要求。

The measurement accuracy of the photoelectric theodolite is decided based on measurement requirement of the ballistic trajectory. Two simple equations were derived mathematically, one expression for positioning error of the ballistic trajectory, angle error of the photoelectric theodolite, ranging error, target slant range and height when one instrument is used, another expression for positioning error of the ballistic trajectory, angel error of the photoelectric theodolite, target slant range and intersection angle when two symmetrical intersection instruments are used.

通过数学解析的方法，推导建立了2个简洁的公式：1）单站定位体制下弹道点位精度和光电经纬仪测角、测距精度以及目标斜距、高角之间的数学表达式；2）对称交会测量体制下弹道点位精度和光电经纬仪测角精度以及目标斜距、交会角之间的数学表达式。

There are prehistoric people, like Aristotle, Augustine, and Thomas Aquinas, also historical people, like Descartes, Gassendi, Hegel, Feuerbach and many contemporary British-American figures in the philosophical circle.

阿奎那，和史中的笛卡尔、伽桑狄，黑格尔、费尔巴哈，以及当代英美哲学界的很多重要人物。

Just as with ordinary polygons, these will be formed from lines but with angles of 45 or 90 degrees between them.

正如普通多边形，它们由线条构成，但线之间的角度为45或90度。