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US08149415B2 Background-free absorption spectroscopy using spectral differentiator 有权
使用光谱微分器的无背景吸收光谱

Background-free absorption spectroscopy using spectral differentiator
Abstract:
An absorption spectrometer provides improved rejection of background radiation signal by employing a frequency-swept laser signal without frequency dithering and performing an effective differentiation of output light from a test cell to eliminate these constant or slowly varying background radiation levels.
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