Low-frequency/ultralow-frequency acceleration transducer with polyvinylidene fluoride piezoelectric films

Abstract

The invention discloses a low-frequency / ultralow-frequency acceleration transducer with polyvinylidene fluoride piezoelectric films. The low-frequency / ultralow-frequency acceleration transducer comprises a supporting cylinder used as the main body of the low-frequency / ultralow-frequency acceleration transducer with the polyvinylidene fluoride piezoelectric films, two ends of the supporting cylinder are fixedly provided with two elastic film structures, small holes are formed in the centers of the two elastic film structures, and a central shaft of the transducer is fixed on an upper cover of the transducer and the center of two ends of the base of the transducer by passing through the small holes; and a hollow slidable mass block arranged in the center of the elastic film structures is sleeved on the central shaft and is fixed with the upper and the lower elastic film structures, and the polyvinylidene fluoride films as piezoelectric materials are pasted on upper and lower elastic films. According the invention, the low-frequency / ultralow-frequency acceleration transducer with the polyvinylidene fluoride piezoelectric films has the advantages of enhanced measuring sensitivity, decreased disturbances between shafts, reduced size, improved process, enhanced resistance to low-frequency-band disturbances, and improved unidirectional property and stability.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride piezoelectric film low-frequency and ultra-low frequency acceleration sensor, in particular to a low-frequency and ultra-low frequency acceleration sensor of a novel piezoelectric material and a novel structure. Background technique [0002] Low-frequency and ultra-low-frequency vibrations are common physical phenomena, such as derricks, transmission towers, high-rise buildings, railway road bridges, dam vibrations, and seismic waves. The main modes of this type of vibration are concentrated in the low frequency band, and the vibration frequency is very low. The frequency components below 1Hz are complex, the amplitude is large, the destructive power is strong, and the detection is difficult. However, the actual use frequency of most inertial sensors is above 2Hz. , or even higher, in such a low frequency band, the output signal of this type of sensor is often submerged in the noise signal, making it d...

AI Technical Summary

Problems solved by technology

The main modes of this type of vibration are concentrated in the low frequency band, and the vibration frequency is very low. The frequency components below 1Hz are complex, the amplitude is large, the destructive power is strong, and the detection is difficult. However, the actual use frequency of most inertial sensors is above 2Hz. , or even higher, in such a low frequency band, the output signal of this type of sensor is often submerged in the noise signal, making it difficult to achieve accurate measurement and analysis

At present, both at home and abroad are paying more attention to the measurement and research of low frequency and ultra-low frequency. Scientists and scholars from all over the world are trying to use new methods to achieve the measurement purpose, but the breakthrough is not obvious.

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