Japan Spectroscopic Co., Ltd.

Tomoyuki Fukazawa

Yoshiro Fukasawa

Michihiro Kawamura

In a double-beam spectrophotometer intended for spectral analysis in the infrared region, inputs to a light detector are switched to dark, reference light, sample light, and reference light in this order, and those components in an output signal of the detector which have a fundamental frequency corresponding to one cycle of the switching and a frequency twice the fundamental frequency undergo arithmetic operation to determine the ratio of the sample to reference light intensity, which is representative of the transmittance of the sample.

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Tokyo, Japan

Tomoyuki Fukazawa