摘要
由于计算机操作系统多任务特性的局限性,无法满足数字干涉图分析技术的处理速度和操作的实时性,根据时-频域分析原理,提出了基于FPGA设计干涉图相位提取IP核,实现加窗傅里叶变换法(WFTM),WFTM-IP核包括数字干涉图的传输/存储模块、二维窗口傅里叶变换(2D-WFT)模块、频谱生成和相位提取等模块,从而完成高速干涉图相位提取。通过计算机仿真、云纹干涉和投影光栅实验测试,二维窗口傅里叶变换方法能够有效的缩短相位提取时间,提高了相位分布的提取速度,验证了WFTM-IP核的有效性和可靠性。
Due to the limitation of multitasking of computer operating system,the processing speed and the real-time operation of digital interferogram analysis cannot be satisfied. Based on the principle of time-frequency domain analysis,a high-speed phase extraction technique of interferograms is proposed by designing a IP core with FPGA( field programmable gate array) to implement the windowed fourier transform method( WFTM). The WFTM-IP core includes the transmission and storage module for digital interferograms,two dimensional windowed Fourier transform( 2 D-WFT) module,spectrum generation module and phase extraction module. Computer simulation and experimental results show that this propose technique can reduce the time and improve the speed of phase extraction,and verify the effectiveness and reliability of the WFTM-IP core.
出处
《电子测量与仪器学报》
CSCD
北大核心
2018年第6期124-130,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(61671008)
广西自然科学基金重点项目(2015GXNSFDA139003)
广西自动检测技术与仪器重点实验室基金(YQ14115、YQ17103)资助项目
