The spectrum of 1 O 2 was measured by the InGaAs photodiode for an optical communication system with charge integration amplifier (InGaAs-CIA). The photo-excited current is charged in photodiode junction capacitance itself. The current is changed to the voltage about 10 12 times without feedback resistance. The minimum detectable power of InGaAs CIA system with liquid nitrogen was achieved 0.1 fW of 10 sec integration time at the wavelength of 1.28 μm. The optical band pass filter-based system for ultra-low-level light detection was succeeded in spectrum measurement of 1 O 2 by 13-LOOH with cytochrome c. The 8 channel InGaAs-CIA array system enables to achieve optical multichannel detection for ultra-low level light at 10 −13 W from 10 −15 W level in the near-infrared region. The optical resolution was about 200 nm by 1 channel. The spectrum of 1 O 2 by mixing NaOCl and H 2 O 2 was demonstrated. The shape of spectrum by 1 O 2 was matched to that of measured by the spectrometer. The system was succeeded in instantaneous 1 O 2 spectrum measurement without moving the wavelength dispersion device. The generation of 1 O 2 by photo-excited Rose Bengal was fabricated to develop food antioxidant chemistry or source reagent of cosmetic product. The system uses super luminosity LED for excitation light source and InGaAs CIA. The 1 O 2 generation will be controlled by the InGaAs-CIA monitoring system. The system will be used in the chemical plant of primary material production.
A weather measurement system was constructed using near-infrared light-emitting diodes and indium gallium arsenide photodiodes for the 1-2 µm near-infrared region. The difference in the absorbance of water for near-infrared light at wavelengths of 945 and 1450 nm was used to distinguish between three different precipitation types: snow, sleet and rain. From the ratio of the number of generated light absorption events at the two wavelengths, a distinction between snow, sleet and rain events was demonstrated. The judgement results by this system were consistent with those obtained from the meteorological observatory weather database.
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