{'fraction_non_alphanumeric': 0.017077798861480076, 'fraction_numerical': 0.013282732447817837, 'mean_word_length': 5.6, '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}}
Digital Heterodyne Interferometry

Measurements of optical phase differences have been obtained with resolutions of 1/500 wave rms at 100 kHz data rates using frequency shift interferometry. One implementation of this approach, called the digital heterodyne interferometer, uses Bragg cells to generate the frequency shift, and has been applied extensively to real-time, high precision measurements as well as in limited applications to optical testing. We discuss the fundamentals of this approach and review the applications.