Fringes are formed when the optical difference (OPD) between a reference wave front and a test wave front based on the interference of light is an integral multiple of the illuminating wavelength.
测试中，当测试波前相对于参考波前的光程差是照明波长的整数倍时形成干涉条纹，由此而形成的二维图就是干涉图像。
A set of wavelength reference is involved in the system as calibration to correct non-ideal performance of the F-P filter.
针对F-P滤波器的非线性特性的影响，分析了设置波长参考的必要性并提出了具体方法。
In standard reference channel, ITU standard reference creates a comb spectrum with fixed wavelength.
在参考通道，ITU标准参考模块的输出是具有固定波长的梳状光谱。
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