{'fraction_non_alphanumeric': 0.020095693779904306, 'fraction_numerical': 0.016267942583732056, 'mean_word_length': 5.011494252873563, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Prelaunch calibration systems for the short wavelength infrared radiometer of the earth resources satellite-1

A new radiometric calibration system is developed for the prelaunch calibration 'of the Short Wavelength Infrared Radiometer (SWIR) of the Optical Sensors of the Japanese Earth Resources Satellite-I (ERS-I) to be launched in 1992. The primary standard of the calibration system is fixed-point blackbodies of zinc, lead and tin whose spectral radiances are about the same as the maximum radiances to be calibrated. The secondary standard is a small internally illuminated integrating sphere of 250 mm inner diameter with an aperture of 50 mm in diameter. The spectral radiances are transferred to a large internally illuminated integrating sphere with an inner diameter of 1 m and an aperture of 300 mm in diameter. The SWIR is calibrated against the large integrating sphere. Uncertainty of the spectral radiances of the small Integrating sphere is preliminary estimated to be ±1.6% and that of the large integrating sphere to be ±3%.