{'fraction_non_alphanumeric': 0.019810508182601206, 'fraction_numerical': 0.0034453057708871662, 'mean_word_length': 5.180851063829787, '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}}
Radio accessible SAW sensors for non-contact measurement of torque and temperature

Surface acoustic wave (SAW) based sensors can easily be interrogated by low power radio signals. They therefore are ideally suited for non-contact measurement of torque and temperature on rotating shafts. It is advantageous to use lithium niobate as a substrate material because of its linear temperature response and its high electro-mechanical coupling efficiency. With this material, however, the sensitivities of temperature and torque measurement are strongly different: a small change in temperature of only a few Kelvin will cause a sensor signal of the same amount as the nominal torque of a typical shaft. It is experimentally demonstrated that, despite the strong temperature sensitivity of the sensors, exact measurements of both torque and temperature can be accomplished over a wide temperature range from 0/spl deg/C to more than 70/spl deg/C, while the resolution of torque measurement is well below 1%. Deviations from linearity are small, so that a third order polynomial in temperature and torque is sufficient to describe the sensor response characteristics.