| 摘要 |
PURPOSE:To decrease yield of noises due to phase deviation caused by rapid absorption and the like, by detecting a sample light component and a reference light component having different frequencies, and performing specified electric processing. CONSTITUTION:Light emitted from a light source becomes sample luminous flux 13 with a frequency (f) and reference luminous flux with a frequency 2f through plane mirrors 2 and 3, concave mirrors 4 and 5, and choppers 17 and 18. Both luminous fluxes 13 and 14 pass a sample cell 15 and a reference cell 15, respectively, are guided to a monochrometer 11 through plane mirrors 6 and 7, a half mirror 8, a concave mirror 9, and a plane mirror 10, and are inputted to a detector 12. Its output is sent to an amplifier 19, filters 20 and 21, and rectifiers 22 and 23, and rectified by the aid of synchronized wave signal from a synchronized waveform device 24, which is synchronized with the choppers 17 and 18. The sample component output S' is sent to a differential amplifier 26 directly and through a differential circuit 25. A sample signal S, from which noises are removed, is sent to a divider 27. The ratio between the signal S and a reference signal R from the rectifier 22 is obtained and recorded in a recorder 28. Thus the generation of the noises can be decreased.
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