26 September 1989 A Radiometer For Precision Coherent Radiation Measurements
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A radiometer had been designed for precision coherent radiation measurements and tested for long-term repeatability at wavelengths of 488 and 633 nm. The radiometer consists of a single high-quality PN silicon photodiode maintained in a nitrogen atmosphere with a quartz window designed to eliminate interference problems. Ratio measurements between the radiometer and an absolute type detector were made over a period of 215 days. At 0.5 mW, the standard deviations were 0.008 and 0.009 % at 488 and 633 nm respectively. The maximum deviations from the mean were 0.016 and 0.015 % at the respective wavelengths. The high precision, simplicity, and portability of the radiometer make it an excellent transfer standard for radiometric measurements.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Douglas B. Thomas, Edward F. Zalewski, "A Radiometer For Precision Coherent Radiation Measurements", Proc. SPIE 1109, Optical Radiation Measurements II, (26 September 1989); doi: 10.1117/12.960710; https://doi.org/10.1117/12.960710

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