| 摘要 |
A continuous-wavelength absorption detector adapted for continuous-flow detection is provided. The detector includes an electronics section, a bifurcated optical guide and a detector-cell. Each branch of the optical guide has a plurality of fibers, and at one end the branches are separated and connected to different portions of the electronics section. One of the branches is terminated next to a source for producing illumination to irradiate sample material and the other branch is terminated next to a detector for producing an absorption spectrum signal. At the opposite end of the optical guide the fibers of the two branches are combined to form a common end which is connected to the detector-cell. The detector-cell includes an approximately vertically aligned continuous-flow sample cell which is connected to a sample line and also includes a concave mirror. Within the detector-cell, the common end's fiber ends are held at a fixed location on one side of the sample cell with the concave mirror being located on the opposite side. Illumination is guided from the electronics section through its respective branch of the optical guide to the common end where the light is transmitted from the fixed location across the sample cell to irradiate the sample material. The sampling material absorbs optical energy of certain wavelengths to a greater extent than other wavelengths to provide an absorption spectrum. Portions of the illuminations are reflected back across the sample cell by the concave mirror to the fiber ends at the fixed location. Reflected light which strikes the branch fiber ends associated with the detector for producing the absorption spectrum signal is then guided to the electronics section. There, an absorption spectrum signal is produced which is proportional to the illumination intensity of the wavelengths striking the fiber ends.
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