ldv 中文意思是什麼
ldv
解釋
激光測速儀-
Due to existing signal processing technology ’ s shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high - precise signal processing technology : firstly, to get power spectrum with hanning windowed welch modified periodogram, search its peak value frequency ; secondly, to apply zooming analysis via goertzel algorithm ; at last, to get a highly precise doppler frequency with energy centrobaric rectifying algorithm 。 the simulating result indicated that this technology introduced could get accurate doppler frequency 。 depending on above discussed technology, we designed a signal processing scheme, and developed a signal processing system. the running result showed high performance, verified the feasibility and reliability of the highly precise signal processing technology introduced. in a word, the technology improved ldv ’ s performance such as measurement precision, measurement range, dynamic response time 。 and it will have a wide application foreground
針對存在的缺點，本文提出了一種應用於激光多普勒測速的高精度信號處理技術，即首先利用加hanning窗的welch修正周期圖演算法得到信號功率譜，搜索其譜峰值頻率，接著利用goertzel頻譜細化演算法對搜索的譜峰進行細化分析，再引入能量重心頻譜校正演算法對細化后的譜峰進行校正分析，從而將離散頻譜分析演算法、頻譜細化演算法和頻譜校正演算法三者有機結合起來，充分發揮各自的優點:通過加hanning窗的welch修正周期圖演算法快速得到功率譜及峰值頻率，通過goertzel演算法獲得分析頻帶的高解析度頻譜，然後通過能量重心校正演算法對細化后的頻譜進行高精度校正，這樣不僅保證了演算法的高效性，而且大大提高了分析的精度。 -
Ldv laser doppler velocimeter
激光多普勒測計 -
The velocity, turbulent intensity, and reynolds stress of the liquid was measured with ldv, while the hold up, velocity of gas were measured with piv
用ldv測量液相時均速度、湍動速度和雷諾應力，用piv測量含氣率和氣泡運動速度。 -
Ldv laser doppler velocimetry
激光多普勒測速法 -
( 2 ) base on the analysis of the atomizing principles of spray nozzle, mathematical model of combined spin - flow pressure spray drying was set up and the essential parameters such as spraying pressure, liquid quantity, temperature, spraying angle, inject distance, particle diameter and distribution, hollow diameter for several materials in normal conditions by experiment and ldv
（ 2 ）對旋流式組合壓力噴嘴噴射霧化機理加以分析，建立了旋流式噴嘴霧化的數學模型，採用冷態試驗法並藉助激光霧滴測試等實驗裝置對噴嘴的霧化參數（如霧化壓力、噴液量、料液溫度、霧化角、霧距、霧滴直徑和分佈以及噴嘴的空芯半徑等）進行測量和計算。 -
The self - mixing effect is applied to laser - doppler velocimetry ( ldv ) for improving the traditional ldv which has the more complex system
摘要利用激光自混合技術結合多普勒測速方法，來改進傳統多普勒光路的光路復雜等缺陷。 -
Laser doppler velocimeter ( ldv ) is a precise instrument based on the theory of laser doppler effect with no - touch measurement capability, quick responsibility, high precision, wide measurement range, multiple dimension measurement and direction judgement ability. ldv is applied extensively in the field of science research & education and industrial measurement. in this thesis, we researched on the high - precise signal processing in ldv
激光多普勒測速儀（ ldv ）是根據激光多普勒效應研製而成的一種精密測速儀器，具有非接觸測量、動態響應快、分析精度高、測量范圍寬、可測多維速度和判別速度方向等優點，被廣泛應用於科研教育領域和工業測量領域。 -
Abstract : in this paper, the problems of the window set - up, the forward receiving method by mirror and the way of side direction receiving, when ldv is used to measure the velocity of water flow inside a circular tube, are discussed and some practical experience in the measurement is summarized
文摘:使用二維激光多普勒測速儀（ ldv ）對圓管中水流進行測速時，對于窗口的設置、利用反射鏡前向接收的方法和側向接收方式等問題，本文進行了探討，並總結了測量中的一些實際經驗。
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