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In 1996 an InGaAs radiation thermometer was developed for the temperature range from 150degC to 1100degC. The quality was good except for the size of source effect (SSE). NMIJ and Chino jointly developed a technique for reducing the SSE by using a ray trace method in the design of the objective lens of 0.65 mum and 0.9 mum radiation thermometers. We applied this technique to develop new InGaAs radiation...
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