{'fraction_non_alphanumeric': 0.017241379310344827, 'fraction_numerical': 0.0049261083743842365, 'mean_word_length': 5.187817258883249, '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}}
An Ambient Background Transfer Standard Radiometer

The need exists for a very stable, portable radiometer which can transfer readings from an absolute measuring cryogenic radiometer operating in a vacuum chamber to other laboratories. This will allow electro-optical instruments operating in either air or vacuum to be calibrated relative to the single absolute measuring cryogenic standard. It will also allow characterization of vacuum chamber windows by comparing measurements made in front of and behind the windows. To perform these functions the transfer standard must have good radiometric sensitivity and long-term repeatability in both air and vacuum. It must be reasonably compact and portable and must operate over a wide range of ambient temperatures. Ideally, the transfer standard is linear over a large dynamic range with direct readout in watts or watts/cm2 or watts/cm2·sr and has a flat spectral response from UV to far-infrared wavelengths. Such a transfer standard radiometer utilizing a dualcavity detector is described. The dynamic range, radiometric accuracy and long-term stability of the transfer standard radiometer is presented. Stability data of better than 0,001% per day in air is shown.