Optical absorption spectroscopy with multi-ass cell with adjustable optical path length
An optical absorption and adjustable technology, applied in the field of optical absorption spectroscopy, can solve the problems of reading distortion, low concentration reading, inaccuracy, etc.
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[0063] figure 1 The optical structure of the standard White cell 2 is shown. The White cell is composed of three spherical mirrors with the same curvature radius: a front reflector (field mirror) 4 and two rear reflectors (eyepieces) 6 and 8 arranged side by side. The reflector is arranged opposite to the two rear reflectors. Usually, these reflectors are placed in a measurement chamber (not shown), and the measurement chamber has an inlet and an outlet, allowing the sample fluid (gas or liquid) to enter or exit. In an apparatus for analyzing a gas sample, the distance between the front mirror 4 and the rear mirrors 6, 8 is typically about 80 cm (although larger or smaller devices could be used).
[0064] The light source 10 , taking a xenon arc lamp as an example, has a group of light source lens groups 12 placed on the edge of the front reflector 4 . Preferably, the light source 10 has a wide spectrum and can provide ultraviolet (UV) or ultraviolet-visible (UV-V) spectral ...
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