费格斯在一本塞在某个角落的光学器材目录里发现了一种能阻隔可见光的滤光片。
Tucked away in the corner of an optics catalog, Fergus found a special filter that blocks visible light, but not IR or UV.
获取该图像时使用了四个窄带滤光片，它们都被调谐到可见氢、电离氦、硫和氧。
The image was captured using four narrow-band filters that have been tuned to see hydrogen as well as ionized helium, sulfur and oxygen.
通过采用光学掩膜的方法成功制备了符合设计尺寸要求的可见光滤光片，并利用光纤光谱仪测试了滤光片的光谱特性。
The precise size filter is deposited with the mask method successfully, the spectrum characteristic is tested through utilizing the optical fibre spectrometer.
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