查询词典 accuracy of measurement

Acoustic Doppler Current Profilers is a new kind of flow measuring device widely used in hydrometry. It uses the principle of Acoustic Doppler instruments to measure flow velocity profile. A short time flow measurement, high resolution, good accuracy, integrity data and great information are the characters of ADCP.

多普勒测流仪是当前在水文行业推广的一种新型测流仪器，该仪器利用声学多普勒原理，测量水流速度剖面，具有测验时间短、分辨率高、精度好、资料完整、信息量大等优点。

According to the method of checkout and identification complying with laboratory quality control rules, we made the calibration tests on CEMS smokemeter. After the linear regression analysis of test results, we verified the correlation coefficient was more than 0.99 between FW56-1 smokemeter, which was made by ABB, Germany, and TH-880IV smokemeter, so the high measurement accuracy was confirmed. Moreover, with less than 90% stained space of lens, this instrument can still work accurately, so the probe has big pollution tolerance. It can totally meet the request of pollution online monitoring.

实验采取了符合实验室质量控制技术路线的校验、鉴定方法，对CEMS烟尘测量仪进行了标对实验，通过对实验结果进行线性回归分析，验证了德国ABB公司生产的FW56-1型烟尘测量仪与TH－880Ⅳ烟尘仪测量数据的相关系数均大于0.99，具有很高的测量精度，并且探头对污染的容忍能力特别强，在透镜污染小于90％的情况下对仪器的准确性没有影响，完全能满足污染源在线监测监控系统建设的要求。

The instrument simultaneously sample for three phase voltage and current. Rotary photoelectric coding switch and LCD are used for human-computer interaction. it makes the interface compact and efficient. Utilizing the function of positive and negative edge trigger of the programmable counter array unit in MPU, signal zero-cross is captured for the phase detected based on double way. The software synchronism sampling method based on real-time parameter self-optimizing minishes period truncation error, and the measurement accuracy is improved. The digitization power measure imports traditional two-unit and three-unit methods and expands application range of the instrument. The capacity is discriminated by soft ware table-look-up on the load loss. The value of a quantity is converted to the value when reference temperature (75 ℃) from test temperature.

该仪器具有以下特点：仪器对三相电压电流同时采样；基于旋转式光电编码器和液晶显示屏的人机交互界面简洁而高效；可编程计数器阵列PCA"捕获"信号的过零点用于双向过零平均鉴相，得到准确的相位差和周期；基于实时参数自寻优的软件同步采样，有效地减小了周期截断误差，提高了测量准确度；数字化功率测量引入了传统的二表法和三表法，扩展了仪器的使用范围；实际容量根据负载损耗用软件查表的方法来判别；测量值已从试验温度折算到了参考温度(75℃)时的值。

The vibrating wire sensors is excited by single-coil structure and the vibration signal will be feedback through the phototube and MCU.This structure not only simplify the hardware circuit,but also solve the problem of electromagnetic interference which generated by the course of frequency's excitation and pick-up,improve the measurement accuracy and stability of frequency.The application of sweeping frequency makes the vibration wire start-up more stable and reliable.

振弦传感器采用单线圈电磁激振方式，应用光电管结合MCU进行振动信号反馈，不但简化了硬件电路，而且解除了激振和拾振中电磁干扰问题，提高了测量的精度和稳定性；激振中采用的扫频技术也使振弦的起振更加稳定可靠。

Based on the principle of PEC, surface cracks mainly affect the high frequency components and subsurface crack mainly affect the low frequency components, so the PEC signals can be analyzed in frequency domain, which can eliminate the influence of noises during measurement. A method of frequency spectrum separating point is proposed for flaw classification, which enhances the accuracy in classification of defects. The agreement between theory and experiment shows that the present method is valid and applicable.

通过对脉冲涡流的理论分析发现，表面裂纹主要影响脉冲频谱中的高频成分，而表面下裂纹主要影响脉冲频谱中的低频成分，因此可以将时域中易受噪声影响的脉冲涡流信号变换到频域分析，提出了"频谱分离点"的方法来对裂纹进行分类识别，提高了缺陷分类识别的正确率，理论分析和实验结果相一致，证明了该方法的正确性和有效性。

In the experiment, it proved that the repetitiveness、 reproducibility、 comparability of the 2.0%(NH_4)_ 2CO_3 was better than the original method through repeated experiments. The result of it was equal to the sum of water soluble sodium and the exchangeable sodium and it had better precision and accuracy. The 2.0%(NH_4)_2CO_3 could be chosen as the probational measurement of total alkality.

在本试验中，通过多批次的重复试验证明，2.0%(NH_4)_2CO_3法的重复性、再现性、可比性良好，测定结果稳定可靠，在数值上等于水溶性钠与交换性钠的总和，而且有较好的精密度和准确度，可以作为测定总碱度的试用方法。

This instrument used the parallel p late capacitor to measure relative dielectric constant of film, which equaled to the ratio of the capacity value full of film and the capacity value full of air. It app lied the equipotential ring technology to reduce the error caused by edge effect in the two p late edges, and greatly increased the measurement p recision and accuracy.

该仪器采用将平行板电容器充满薄膜的电容值与充满空气的电容值相比的方法得出薄膜的相对介电常数，并采用等位环技术，减小了两极板在边缘处产生边缘效应所带来的误差，大大提高了测量的精度和准确性。

Metal tube rotameter is a flux measuring device based on the principle of floater ascending or descending in the vertical cone-shaped tube with the flux changing. The subject does research on the problems of the current flowmeters measurement accuracy, intelligence and communication. The paper introduces a design of network metal tube rotameter.

金属管浮子流量计，是基于浮子在垂直锥形管中随流量变化而升降的原理来进行测量的装置，本课题对目前浮子流量计的测量精度、智能化和通信等方面存在的问题进行了研究，论文介绍了网络化金属管浮子流量计的设计。

Comparing the unsteady flow fields obtained by CFD with the measurement results with SPIV, it can be found that the CFD results can capture the main characteristics of the flow fields observed in the experiment results, however, the precision of the CFD needs to be further improved, and to predict the detail flow structures, such as the tip leakage vortex in the compressor rotor, by CFD still has some difficulties, thus, some work should be done to improve the turbulence model for more accuracy prediction of the flow fields by CFD for the complex flow in turbomachinery.

定常计算结果和非定常计算结果都不能很好地反映出转子叶尖泄漏流，转子尾迹和泄漏流在静子通道中的演化，及其与静子的相互作用等复杂流动情况。开展叶轮机适用的湍流模型研究，对于提高叶轮机内部复杂流动数值模拟的准确性具有非常重要的价值。

By means of declinate optical triangulation measuring instrument structure which is firstly proposed, the measured area and resolution of this measuring system are greatly increased, and the high accuracy non－contact measurement of the planeness of a large area plane is realized.

提出的虚拟精密基准的建模与误差补偿技术，解决了在非精密基准上实现精密测量的问题，研制的系统利用现有平台可实现对太阳帆板平面度的高精度测量。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。