The high precision time - interval measuring instrument ( hptimi ) is manufactured for the rigorous requirement such as high precision , high stability and multi - channels in detonation experiment and particle acceleration experiment 高分辨率时间间隔测量仪正是应爆轰物理实验中高可靠性、高精度和多通道等测量要求而研制的,其使用有助于使爆轰与粒子加速等物理实验的电子测量技术达到一个新的水平。
The main contributions of this dissertation include : 1 . aiming at the use of the instrument , the application of time - interval measure in detonation experiment is introduced . furthermore , the importance of hptimi in detonation experiment and its foreground are analyzed 本文的主要内容包括: 1 .针对仪器的用途,介绍时间间隔测量在爆轰物理实验中的应用,说明高分辨率时间间隔测量仪在爆轰物理实验中的重要作用和发展前景。
The precise time - interval measuring is widely used in all kinds of scientific experiments , especially in some large - scale physical experiments such as detonation experiment and particle acceleration experiment , in which some important parameters are obtained by time - interval measuring 精密时间间隔测量广泛地应用于各种科学试验中,特别在爆轰与粒子加速等大型物理实验中,有很多重要的物理参数就是通过时间间隔测量而间接获得的。
Technology of time - interval measurement has been applied in many fields . how to improve its precision is an emergent question . on the basis of analyzing electronic counter ' s principle and error , this paper puts emphasis upon introducing high precision time - interval measurements all over the world . all these methods aim at electronic counter ' s principle error , and obtain special effect . lastly , the progress direction and application foreground of high precision time - interval measurement methods are predicted 时间间隔测量技术在众多领域已经获得了应用,如何提高其测量精度是一个迫切需要解决的问题,在分析电子计数法测量原理与误差的基础上,重点介绍了国内外高精度时间间隔测量方法,这些方法都是对电子计数法的原理误差进行测量,并且取得了非常好的效果;最后给出了高精度时间间隔测量方法的发展方向及应用前景。
The characters , advantages , domestic and foreign status and developing direction of virtual instrument , are inroduced briefly . and the design process of control software of hptimi in the environment of labwindows / cvi is also presented . the primary data exchang mechanism among the contol units of hptimi and the corresponding program flow charts and their programmimg approaches are expatiated 论文通过简单分析虚拟仪器的特点及国内外研究现状和发展方向,详细阐述在labwindows / cvi环境下,高分辨率时间间隔测量仪控制软件设计过程,说明其主要的数据交互机制,给出相应的程序流程图和编程方法。
Besides , factors that affect the results of subdivision driving are discussed . furthermore , after analyzing popular methods applied in laser distance measure , waveform analysis is used in the laser scanner . a high - speed a / d card is used to acquire the signal , related software of this part is programmed and the time of waveform analysis is estimated 然后对常用的距离计数法进行了精度分析，确定在三维激光扫描仪中采用波形记录法实现时间间隔测量，根据三维扫描仪的精度要求采用高速采集卡对激光的主、回波波形进行采集、分析与处理，并编写了波形采集、分析程序，同时对波形分析处理所需要的时间进行了估算。
Travel time is the key point of system , its measure quality decides the survey precision of the stress . time to digital convertor ( tdc ) was applied to accomplish the precision time interval measurement . at the same time , one transmitter - two receivers probe arrangement and zero - crossing detecting method were also applied to reduce the errors in measurement 传播声时是整个测量系统中的关键量,其测量水平决定应力的测量精度,对此本文采用时间-数字转换器( timetodigitalconvertor , tdc )完成高精度时间间隔测量,在实现过程中又分别采用“单端发射-双端接收”的探头布局模式和“过零检测”手段来降低系统检测误差。
In signal processing circuit , the key of our study , based on methods of mcu + cpld and a / d converter , a time interval measurement unit is done , in which an isp cpld counter is carried out to judge laser pulse for controlling counting and offering signal of time series and control , and a count quantization error measurement circuit which main ramp circuit and 12 bits a / d conversion circuit guarantees the resolution of system 信号处理部分是本文研究的关键，采用mcu + cpld的设计方法和模数转换技术构成时间间隔测量单元的理论基础，其中用可在系统编程的cpld计数器实现了对循环光脉冲的判断以开关计数，并提供计数量化误差测量电路相应的时序和控制信号，用斜坡电路和12位a / d转换电路完成对计数量化误差的测量，保证了系统的分辨率。
