{'fraction_non_alphanumeric': 0.025466893039049237, 'fraction_numerical': 0.011884550084889643, 'mean_word_length': 4.784313725490196, '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}}
Fiber optic interferometric humidity sensor by using gelatin

A fiber optic interferometric humidity sensor based on hollow core fiber (HCF) and gelatin humidity sensing film was studied. It was formed by fusion splicing a short length of HCF to the end of a single-mode fiber and coating gelatin film at the free end of HCF. Relative humidity was measured by measuring interference spectrum of the so-formed Fabry-Perot interferometer, which changes with humidity level. High sensitivity of 192 pm/%RH is achieved within the range of 20-80%RH, as well as good stability and repeatability.