| 摘要 |
PURPOSE:To achieve a higher property of following hourly changes in the absorbance of a sample, by setting the fetching of signals to a signal processing circuit so that the fetching frequency of sample signals will be higher than those of reference signals and dark signals. CONSTITUTION:A while light from a light source 1 is applied to a beam splitter 3 through a spectroscope 2. One luminous flux separated is transmitted through a sample or made to pass through a storage sample chamber 4A to be incident into a detector 5A while the other luminous flux is made to pass through a reference chamber to be incident into a detector 5B. Signals from the detectors 5A and 5B are fetched alternately into a signal processing circuit 7 through a changeover switch circuit 6. The circuit 6 is controlled in the switching by a synchronous signal P from a sample signal multifrequency fetching synchronous signal generation circuit 10. The signal P activates the circuit 6 to operate to fetch a sample signal S-reference signal R-sample signal S-dark signal D in the order during one cycle. This achieves a higher property of following hourly changes in the absorbance of a sample.
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