一种校表仪的设计与研制

发布时间：2019-03-11 14:56

【摘要】：钟表行业中必不可少部分就是钟表检测仪器，它的主要作用之一就是确保钟表的产品质量，所以钟表检验仪器通常用来检验组成钟表的各种零部件以及成品钟表是否达到规定的质量指标。钟表检测仪器的类型有很多，其中用的最多的是校表仪，而本文开展的研究也主要是基于校表仪的。本文设计的校表仪能够对表音信号进行采集处理得到机械手表的瞬时日差。系统采用基于DSP的设计方案，DSP作为系统的核心负责数据的采集、计算和对外围电路的控制，包括可控增益放大电路、滤波电路、外部模数转换电路和液晶显示模块。论文重点介绍系统的硬件和软件设计。硬件设计包括器件的性能特点，电路结构和实现的功能。软件部分介绍了瞬时日差的算法，包括计数和互相关算法的实现原理，计数算法，即计算采样点数，由采样点数和采样率得出信号间隔，进而计算瞬时日差。互相关算法有一个重要特性，即如果同种类型的信号x (t)和y (t)相互之间有时延，那么两个信号间时延的大小就可以采用互相关函数准确地计算出来，这种特性使得互相关函数被广泛应用于工程测量技术中。分别用Matlab对两种算法进行了仿真，对比两种算法对同一个信号的计算结果，看到互相关算法的计算精度明显提高。此外还给出了DSP计算和控制外围电路的程序实现方案。本文最后对系统的各部分功能进行了测量，归纳总结了测试结果，提出了改进方法。本系统具有便携，，体积小，重量轻、功耗低的优点。
[Abstract]:The essential part of the clock industry is the clock detection instrument. One of its main functions is to ensure the product quality of the clock, so the watch-and-watch test instrument is usually used to check whether the various components and the finished products of the timepiece have reached the specified quality index. The type of the clock detection instrument is many, among which the most important is the meter, and the research in this paper is mainly based on the school meter. The calibration instrument designed in this paper can acquire the instantaneous day of the mechanical watch with the acquisition and processing of the sound signal. The system adopts the design scheme based on DSP, and the DSP is the core of the system to collect, calculate and control the peripheral circuits, including the controllable gain amplifying circuit, the filter circuit, the external analog-to-digital conversion circuit and the liquid crystal display module. The paper focuses on the hardware and software of the system. The hardware design includes the performance characteristics of the device, the circuit structure and the work achieved. The software part introduces the algorithm of instantaneous daily difference, including the implementation principle of counting and cross-correlation algorithm, counting algorithm, which is to calculate the sampling points, to obtain the signal interval from the sampling points and the sampling rate, and then to calculate the instantaneous day. the cross-correlation algorithm has an important characteristic, that is, if the same type of signals x (t) and y (t) are sometimes extended from each other, the magnitude of the time delay between the two signals can be accurately calculated using the cross-correlation function, this property enables cross-correlation functions to be widely used in engineering measurement techniques, In this paper, the two algorithms are simulated by using Matlab, and the calculation results of the same signal are compared by using the two algorithms, and the calculation accuracy of the cross-correlation algorithm is obviously improved. In addition, the program for calculating and controlling the peripheral circuit is also given. In this paper, the function of each part of the system is measured, the result of the test is summarized and the reform is put forward. The system has the advantages of being portable, small in size, light in weight, low in power consumption,
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH89;TP368.1

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