{'fraction_non_alphanumeric': 0.04518430439952437, 'fraction_numerical': 0.016646848989298454, 'mean_word_length': 5.101449275362318, '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}}
All-interferometric six-degrees-of-freedom sensor based on laser self-mixing

We report on the development of an all-interferometric sensor based on the laser-self-mixing for the simultaneous detection of multi-degrees-of-freedom displacement of a remote target. The prototype system consists only of a laser head, equipped with 6 diode lasers and a properly designed reflective target. Information on a single degree-of-freedom motion is extracted by the differential measurement of two linear displacements by means of two nominally identical self-mixing interferometers. The sensor has been experimentally tested to measure yaw, pitch, roll, straightness and flatness corrections over a continuous linear range of 1 m, with resolutions of 0.7 μm (longitudinal), 20 μm (straightness and flatness), 0.001° (yaw and pitch) and 0.015 °(roll).