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 针对存在的缺点,本文提出了一种应用于激光多普勒测速的高精度信号处理技术,即首先利用加hanning窗的welch修正周期图算法得到信号功率谱,搜索其谱峰值频率,接着利用goertzel频谱细化算法对搜索的谱峰进行细化分析,再引入能量重心频谱校正算法对细化后的谱峰进行校正分析,从而将离散频谱分析算法、频谱细化算法和频谱校正算法三者有机结合起来,充分发挥各自的优点:通过加hanning窗的welch修正周期图算法快速得到功率谱及峰值频率,通过goertzel算法获得分析频带的高分辨率频谱,然后通过能量重心校正算法对细化后的频谱进行高精度校正,这样不仅保证了算法的高效性,而且大大提高了分析的精度。
In this paper , the fundamentals and method of longitudinal displace mentmeasarement utilizing laser doppler effect are introduced . the factors influencing the affecting accuracy are expounded . moreover , the theory analysis and experiment - based methods are offered to improve the accuracy . this study can be applied in analyzing the surface profile and distortion , which is very important in theory and practice for the fields of aviation , mechanical and architecture industries 介绍了激光多普勒纵向位移测量的基本原理和方法,阐述了影响测量精度的要素,并在理论分析和实验的基础上,提出了改进措施.该项研究可应用于分析物体表面轮廓和变形状况,对航空、机械、建筑等工业有重要的理论意义和实用价值
In order to deeply study the characteristics of overflow and seek for the measure to increase the energy dissipation of the stepped spillway at large edt discharge , the method of model test and theory analyze are used to study the stepped spillway oveffiow the typical velocity field of oveffiow is measured using the laser doppler anemometer and the mechbosm of the energy dissipation is analyzed 为了进一步深入研究阶梯溢流坝坝面水力特性，同时探求在大单宽流量下提高阶梯溢流坝消能率的措施，本文主要采用物理模型试验和理论分析相结合的方法对阶梯溢流坝坝面水力特性进行了较为系统的研究。首次采用了激光多普勒测速仪对阶梯溢流坝的典型速度场进行了详细测量，分析了阶梯溢流坝的消能机理。
