{'fraction_non_alphanumeric': 0.02012578616352201, 'fraction_numerical': 0.010062893081761006, 'mean_word_length': 5.170542635658915, '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}}
Intrinsic fiber optic ultrasound sensor for oil immersed detection of partial discharges

A fiber-optic ultrasound sensor is presented for acoustic detection of partial discharges in oil immersed set-ups. Its specifications are similar to R15i (optimized sensor for the detection on the walls of transformers) but for internal installation. It consists of an intrinsic fiber-optic sensing probe, an all-fiber interferometer, homodyne demodulation and an optoelectronic specific conditioning for detecting ultrasounds in the range of 100 kHz – 300 kHz. It is characterized in water and tested with real partial discharges in oil. The sensing probe is based on a multilayer coil that is customized to a specific sensitivity. It is a cost-effective solution useful for a multichannel configuration.