由于仪器函数的自身线宽及其周期性的加宽作用结果，导致透射函数的半峰值线宽受到加宽，可见度下降。
The full width of transmission function at half maximum is broadened and the visibility is reduced because of the instrumental linewidth and the periodicity of transmission function.
结果表明该滤波器的透射光谱是余弦函数调制后的光纤光栅反射光谱。
It was found that the transmission spectrum of the filter is the cosine function modulated reflection spectrum of the fiber grating.
在测量范围内可以产生单色辐射光学系统的分光光度计也可以使用。通常光谱是透光度（透射光强度与入射光强度之商）的函数。
Normally the spectrum is given as a function of transmittance, the quotient of the intensity of the transmitted radiation and the incident radiation.
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