激光技术
激光技術
격광기술
LASER TECHNOLOGY
2014年
2期
177-180
,共4页
王晓琳%贺锋涛%贾琼瑶%刘佳
王曉琳%賀鋒濤%賈瓊瑤%劉佳
왕효림%하봉도%가경요%류가
激光光学%激光散斑%散斑对比度%频率
激光光學%激光散斑%散斑對比度%頻率
격광광학%격광산반%산반대비도%빈솔
laser optics%laser speckle%speckle contrast%frequency
散斑噪声的存在使得图像灰度剧烈变化,降低了图像分辨率,影响成像质量。为了控制散斑噪声,使用波长为405 nm的激光作为显微系统照明光源,利用音圈电机振动光纤,通过对抛光玻璃显微成像,用CCD图像采集卡采集图像后进行了散斑噪声对比度分析。结果表明,在光纤振动幅度不变、振动频率在4Hz~55Hz内逐渐增加时,图像散斑对比度在0.0326~0.1197范围内逐渐变小;当频率大于51Hz时,图像散斑对比度曲线趋于平稳且对比度在0.0326处获得了最小值,图像清晰,达到良好的散斑控制。
散斑譟聲的存在使得圖像灰度劇烈變化,降低瞭圖像分辨率,影響成像質量。為瞭控製散斑譟聲,使用波長為405 nm的激光作為顯微繫統照明光源,利用音圈電機振動光纖,通過對拋光玻璃顯微成像,用CCD圖像採集卡採集圖像後進行瞭散斑譟聲對比度分析。結果錶明,在光纖振動幅度不變、振動頻率在4Hz~55Hz內逐漸增加時,圖像散斑對比度在0.0326~0.1197範圍內逐漸變小;噹頻率大于51Hz時,圖像散斑對比度麯線趨于平穩且對比度在0.0326處穫得瞭最小值,圖像清晰,達到良好的散斑控製。
산반조성적존재사득도상회도극렬변화,강저료도상분변솔,영향성상질량。위료공제산반조성,사용파장위405 nm적격광작위현미계통조명광원,이용음권전궤진동광섬,통과대포광파리현미성상,용CCD도상채집잡채집도상후진행료산반조성대비도분석。결과표명,재광섬진동폭도불변、진동빈솔재4Hz~55Hz내축점증가시,도상산반대비도재0.0326~0.1197범위내축점변소;당빈솔대우51Hz시,도상산반대비도곡선추우평은차대비도재0.0326처획득료최소치,도상청석,체도량호적산반공제。
The image gray can be changed by severely the speckle noise , so the image resolution can be reduced and the image quality was decreased .In order to control the speckle noise , using a laser at 405nm wavelength as light source of the microscopic imaging system and a voice coil motor vibrating the optical fiber , images was obtained by the polished lens and captured with a CCD image acquisition card , the speckle noise contrasts were studied .The results show that when the fiber vibration amplitude is stable and the vibration frequency is increased from 4Hz to 55Hz, the image speckle contrasts change in the range of 0.0326~0.1197 and the overall trend gradually becomes smaller .The image speckle contrast levels off when the frequency is more than 51Hz.When the speckle contrast reaches the minimum at 0.0326, the image is clear and the laser imaging speckle can be controlled satisfactorily .