其次，针对甲烷在近红外波段吸收弱的特点，把光谱调制技术用于浓度检测。
Secondly, spectral modulation techniques are applied into concentration detection because methane has very weak absorption in near-infrared region.
最后通过对三厘米波段吸收式空腔波长计的测量，验证了上述计算公式的正确性。
The above results are verified by the measurement of a cavity wavemeter of the absorption type working on 3-cm wavelength.
事实上，新装置不吸收可见光波段就使它的效率比不透明的有机电池低。
The fact that the new device does not absorb appreciably at visible wavelengths makes it less efficient than opaque organic cells.
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