| 摘要 |
Apparatus for simultaneously and continuously comparing the absorption in two sample cells at two wavelengths. Two adjacent sample cells are illuminated from adjacent sources radiating at different wavelengths. A first lens positioned near the cells forms images of the two sources. A second lens positioned near the source images forms images of the cells. A plane mirror just behind the second lens displaces radiation from one source so that there are formed two sets of cell images, each at a different wavelength. Photocells at the cell images, and a comparison circuit, allow the absorption in both cells at both wavelengths to be compared.
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