激光技术
激光技術
격광기술
LASER TECHNOLOGY
2015年
3期
419-422
,共4页
激光光学%激光散斑%功率谱%谱宽%散斑对比度%频域
激光光學%激光散斑%功率譜%譜寬%散斑對比度%頻域
격광광학%격광산반%공솔보%보관%산반대비도%빈역
laser optics%laser speckle%power spectrum%spectral width%speckle contrast%frequency domain
激光散斑在相干光成像、全息术、多模光纤通信、计量等领域具有重要的应用。为了对激光散斑进行评价，提出一种在频域采用散斑图像功率谱谱宽作为激光散斑评价的方法，设计了一种基于光纤振动的功率谱散斑评价实验装置。采用0．5W，532nm激光作为光源，通过电压驱动音圈电机振动光纤对激光散斑进行控制，利用CCD图像采集卡采集图像后，分别采用散斑图像的对比度方法和功率谱方法对不同驱动电压下的散斑图像进行了分析评价。结果表明，功率谱方法具有较高的灵敏度及较宽的评价范围。
激光散斑在相榦光成像、全息術、多模光纖通信、計量等領域具有重要的應用。為瞭對激光散斑進行評價，提齣一種在頻域採用散斑圖像功率譜譜寬作為激光散斑評價的方法，設計瞭一種基于光纖振動的功率譜散斑評價實驗裝置。採用0．5W，532nm激光作為光源，通過電壓驅動音圈電機振動光纖對激光散斑進行控製，利用CCD圖像採集卡採集圖像後，分彆採用散斑圖像的對比度方法和功率譜方法對不同驅動電壓下的散斑圖像進行瞭分析評價。結果錶明，功率譜方法具有較高的靈敏度及較寬的評價範圍。
격광산반재상간광성상、전식술、다모광섬통신、계량등영역구유중요적응용。위료대격광산반진행평개，제출일충재빈역채용산반도상공솔보보관작위격광산반평개적방법，설계료일충기우광섬진동적공솔보산반평개실험장치。채용0．5W，532nm격광작위광원，통과전압구동음권전궤진동광섬대격광산반진행공제，이용CCD도상채집잡채집도상후，분별채용산반도상적대비도방법화공솔보방법대불동구동전압하적산반도상진행료분석평개。결과표명，공솔보방법구유교고적령민도급교관적평개범위。
Laser speckle has important applications in many areas , such as optical coherence tomography , holography , multimode optical fiber communication and metrology .In order to evaluate the laser speckle , the power spectrum width of speckle image in frequency domain was proposed as the evaluation method of laser speckle .The experiment device of power spectrum speckle evaluation was designed based on optical fiber vibration .A 0.5W, 532nm laser was used as light source and a voltage-driven voice coil motor was used to vibrate the fiber and control laser speckle . A CCD image acquisition card was used to collect images .Speckle contrast method and power spectrum method were respectively used to evaluate the speckle images under different driving voltages .The results show that the method of power spectrum has higher sensitivity and wider range of evaluation .
