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用激光全息术对文物在进行无损探伤时,实验证明不大的温度变化,就能从它们的二次曝光全息干涉图上显示出隐蔽的裂纹或修补处,因而对文物是安全的。对文物振动状态的研究,需通过拍摄它的时间平均全息干涉图。以《春秋兽面蟠蛇纹钟》为例,从正视方向的振动引起的光程变化,容易产生相应的干涉图象;所以《编钟》的振型图需从90°夹角,它的两个面的全息干涉图来综合考虑。从四幅全息干涉图上,发现《编钟》的基音的振型因打击部位不同而会有两种不同的振型,产生两种不同频率的音调。若从它的钟口的剖面来分析,由于受《编钟》形体的影响,击点部位改变,振型
Laser holography on artifacts in the non-destructive testing, the experiment proved little temperature change, they can reveal from the secondary exposure of holographic interferograms of hidden cracks or repairs, and therefore is safe for cultural relics. Research on the vibration state of cultural relics needs to take time-averaged holographic interferograms by photographing it. Taking the spring and autumn beast snake bell as an example, it is easy to produce the corresponding interference image due to the optical path change caused by the vibration in the frontal direction. Therefore, the shape of the “chime” A holographic interference map to consider. From the four holographic interferograms, it was found that the pitches of the “chime” have two different modes due to different strike positions, resulting in two different frequencies. If it is from the mouth of the mouth to analyze the profile, due to the “chime” shape of the body, hitting the site change, mode