Sumitomo Electric Industries, Limited

Doryokuro Kakunenryo Kaihatsu Jigyodan

Yoshiaki Ichige

Minoru Watanabe

Yoichi Ishiguro

Haruhiko Aikawa

Fumitoshi Okamoto

A spectroanalyzer accurately spectroanalyzes in spite of the deterioration of transmissibility of an optical fiber (5) by radiation, by using a light from a sample cell (1) as a measurement light which passes through the optical fiber (5). The spectroanalyzer comprises a white light source (15) for directing a monitoring light to a one end (5b) of the optical fiber (5), and a half-mirror (3) arranged in front of the other end (5a) of the optical fiber (5) for reflecting the monitoring light, which is modulated to permit the discrimination thereof from the measurement light. Accordingly, a degree of deterioration of the optical fiber (5) can be determined from the monitoring light, and the affect of the deterioration of the transmissibility can be corrected by dividing a measurement light power by a monitoring light power so that the accurate measurement of the sample cell 1 is attained in spite of the deterioration of the transmissibility of the optical fiber (5).

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Naka, Japan

Yoshiaki Ichige