| 摘要 |
An optimal combination is made, in a leaktight casing, near the measurement points, of at least one high-excitance radiation source, mirror optical members, advantageously conical and with immersion, guiding the radiation through the fluid and concentrating it homogeneously at the input diaphragm (pupil) of a refringent conductor, preferably with a high numerical aperture, which conveys this radiation to the spectrophotometric measurement apparatus situated at the desired distance. <IMAGE>
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