基于FPGA的红外热成像闪光灯激励电源
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摘要
红外热成像技术是一种快速有效的无损检测技术,广泛应用于航空航天、轨道交通、核工业等领域。激励电源是红外热成像检测系统中的关键设备,其性能将影响缺陷的检测结果。采用线性放大产生激励的方式存在增益带宽积的限制,较难满足红外热成像技术对激励频率范围和输出功率的要求。本文采用数字的方式将电压进行调制,实现了较大功率的输出,提高了对缺陷的检测效率。为满足红外热成像技术对输出功率、参数调整、以及多种工作模式的要求,本文设计了一款基于FPGA的数字化闪光灯激励电源。该电源主要包括低频正弦产生电路、全桥斩波电路和FPGA控制系统三部分,其中控制系统为核心部分。试验证明,该电源实现脉冲和锁相两种激励模式,参数调整方便,能够满足红外热成像技术对激励电源提出的要求。
Infrared thermography is a fast and effective non-destructive testing(NDT) method which has been widely used in the fields of aerospace,rail transit,nuclear and etc.The excitation source is a crucial device for the optical thermography system whose performance has an impact on the test results.There is a limitation of gain bandwidth product by using linear amplification to generate excitation,and it is difficult to meet the requirements of frequency range and high power.In this paper,the voltage is modulated in a digital way to achieve a higher power output and improve the efficiency of defect detection.In order to meet the requirements of power,frequency and multi-mode,an excitation source for the infrared thermography based on FPGA is designed.The excitation source includes the low-frequency sinusoidal generating circuit,full-bridge chopper circuit and FPGA control system,of which the control part is the focus.Experiments′ results show that the excitation source can realize two modes of excitation(pulse mode and lock-in mode),and be easy to adjust,and meet the requirements of infrared thermography on the excitation source.
Infrared thermography is a fast and effective non-destructive testing(NDT) method which has been widely used in the fields of aerospace,rail transit,nuclear and etc.The excitation source is a crucial device for the optical thermography system whose performance has an impact on the test results.There is a limitation of gain bandwidth product by using linear amplification to generate excitation,and it is difficult to meet the requirements of frequency range and high power.In this paper,the voltage is modulated in a digital way to achieve a higher power output and improve the efficiency of defect detection.In order to meet the requirements of power,frequency and multi-mode,an excitation source for the infrared thermography based on FPGA is designed.The excitation source includes the low-frequency sinusoidal generating circuit,full-bridge chopper circuit and FPGA control system,of which the control part is the focus.Experiments′ results show that the excitation source can realize two modes of excitation(pulse mode and lock-in mode),and be easy to adjust,and meet the requirements of infrared thermography on the excitation source.
引文
[1] ZHENG Kai,JIANG Haijun,CHEN Li.Infrared thermography NDT and its development[J].Infrared Technology.2018,40(5):401-411.(in Chinese)郑凯,江海军,陈力.红外热波无损检测技术的研究现状与进展[J].红外技术,2018,40(5):401-411.
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[6] CHEN Fei,JIANG Haijun,CHEN Li.Lock-in thermography base on optical chopper[J].Nondestructive Testing,2018,40(5):68-71,75.(in Chinese)陈飞,江海军,陈力.基于光学斩波的锁相热波成像技术[J].无损检测,2018,40(5):68-71,75.
[7] FENG Lichun,TAO Ning,XU Chuan.Lock-in thermography and its application in nondestructive evaluation[J].Infrared and Laser Engineering,2010,39(6):1120-1123.(in Chinese)冯立春,陶宁,徐川.锁相热像技术及其在无损检测中的应用[J].红外与激光工程,2010,39(6):1120-1123.
[8] LI Jianren.Research progress of digital control for switching power supply[J].Microelectronics,2016,46(4):562-566.(in Chinese)李建仁.开关电源数字控制技术进展[J].微电子学,2016,46(4):562-566.
[9] HE Weiting,CHENG Qijian.Analysis and realization of algorithms for SPWM waves[J].Electronic Design Engineering,2016,24(23):85-88.(in Chinese)贺为婷,程启建.SPWM波形生成算法的研究与仿真[J].电子设计工程,2016,24(23):85-88.
[10] XU Sheng,ZHAO Jianfeng.Analysis of the harmonic characteristics of the CPS-SPWM output voltage of cascaded H-Bridge converters based on irregular sampling[J].Transactions of China Electrotechnical Society,2011,26(6):121-128.(in Chinese)许胜,赵剑锋.基于不对称规则采样法的级联H桥型变流器CPS-SPWM输出电压谐波特性分析[J].电工技术学报,2011,26(6):121-128.
[11] LIU Suzhen,LI Wenjie,JIN Liang,et al.Power source of electromagnetically induced acoustic emission based on DDS[J].Transactions of China Electrotechnical Society,2012,27(6):6-11.(in Chinese)刘素贞,李文杰,金亮,等.基于DDS技术的电磁声发射涡流加载电源[J].电工技术学报,2012,27(6):6-11.
[2] CHEN Dapeng,MAO Hongxia,XIAO Zhihe.Infrared thermography NDT and its development[J].Computer Measurement & Control,2016,24(4):1-6,9.(in Chinese)陈大鹏,毛宏霞,肖志河.红外热成像无损检测技术现状及发展[J].计算机测量与控制,2016,24(4):1-6,9.
[3] Vavilov V P.Dynamic thermal tomography:recent improvements and applications[J].NDT & E International,2015,71:23-32.
[4] Yang R,He Y.Optically and non-optically excited thermography for composites:a review[J].Infrared Physics & Technology,2016,75:26-50.
[5] ZHAO Yanguang,GUO Xinlin,REN Mingfa.Lock-in infrared thermography for the non-destructive testing of fatigue specimen with defects[J].Acta Optica Sinica,2011,28(1):199-205.(in Chinese)赵延广,郭杏林,任明法.基于锁相红外热成像理论的复合材料网格加筋结构的无损检测[J].复合材料学报,2011,28(1):199-205.
[6] CHEN Fei,JIANG Haijun,CHEN Li.Lock-in thermography base on optical chopper[J].Nondestructive Testing,2018,40(5):68-71,75.(in Chinese)陈飞,江海军,陈力.基于光学斩波的锁相热波成像技术[J].无损检测,2018,40(5):68-71,75.
[7] FENG Lichun,TAO Ning,XU Chuan.Lock-in thermography and its application in nondestructive evaluation[J].Infrared and Laser Engineering,2010,39(6):1120-1123.(in Chinese)冯立春,陶宁,徐川.锁相热像技术及其在无损检测中的应用[J].红外与激光工程,2010,39(6):1120-1123.
[8] LI Jianren.Research progress of digital control for switching power supply[J].Microelectronics,2016,46(4):562-566.(in Chinese)李建仁.开关电源数字控制技术进展[J].微电子学,2016,46(4):562-566.
[9] HE Weiting,CHENG Qijian.Analysis and realization of algorithms for SPWM waves[J].Electronic Design Engineering,2016,24(23):85-88.(in Chinese)贺为婷,程启建.SPWM波形生成算法的研究与仿真[J].电子设计工程,2016,24(23):85-88.
[10] XU Sheng,ZHAO Jianfeng.Analysis of the harmonic characteristics of the CPS-SPWM output voltage of cascaded H-Bridge converters based on irregular sampling[J].Transactions of China Electrotechnical Society,2011,26(6):121-128.(in Chinese)许胜,赵剑锋.基于不对称规则采样法的级联H桥型变流器CPS-SPWM输出电压谐波特性分析[J].电工技术学报,2011,26(6):121-128.
[11] LIU Suzhen,LI Wenjie,JIN Liang,et al.Power source of electromagnetically induced acoustic emission based on DDS[J].Transactions of China Electrotechnical Society,2012,27(6):6-11.(in Chinese)刘素贞,李文杰,金亮,等.基于DDS技术的电磁声发射涡流加载电源[J].电工技术学报,2012,27(6):6-11.