High-g value acceleration sensor based on flexoelectric effects and measurement method

Abstract

The invention discloses a high-g value acceleration sensor based on flexoelectric effects and a measurement method. The sensor comprises a substrate and an insulated rigid cylindrical shell fixedly connected, wherein two flexoelectric material truncated cones are oppositely arranged in the insulated rigid cylindrical shell; a certain pre-tightening force is provided through the upper cover of the insulated rigid cylindrical shell; electrodes are applied to the upper surface and the lower surface of each flexoelectric material truncated cone; the electrode is connected with the input end of a charge amplifier; and the output end of the charge amplifier is connected with a signal processing, display and storage module. When the high-g value acceleration is measured, the high-g value acceleration exists in the substrate, the high-g value acceleration is transferred to the flexoelectric material truncated cones via the insulated rigid cylindrical shell, the flexoelectric material truncated cones are deformed under an inertia force to generate strain gradient, polarized charges are generated and then transferred to the charge amplifier via the electrodes, and the substrate movement high-g value acceleration change conditions are displayed in real time through processing. No power needs to be provided for the flexoelectric material truncated cones, and the high-g value acceleration sensor based on flexoelectric effects has the advantages that no external mass block exists, the range is wide, the applied frequency band is wide, the real-time performance is good, measurement is direct, and the structure is simple.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a flexoelectric effect-based high-g acceleration sensor and a measurement method. Background technique [0002] Among the existing acceleration measurement technologies, piezoelectric, piezoresistive, capacitive, and servo types are mostly used. The real-time monitoring of acceleration has important applications in military affairs and daily life, such as judging whether to open the airbag according to the measured acceleration value in the car, simulation of the hypergravity environment, seismic wave detection, and attitude adjustment of satellite celestial bodies. [0003] Existing piezoelectric acceleration sensors based on piezoelectric materials have been widely used in devices for measuring acceleration. However, the piezoelectric acceleration sensor needs to place a mass on the piezoelectric crystal, and in order to isolate any strain of the test piece from being transmit...

AI Technical Summary

Problems solved by technology

However, the piezoelectric acceleration sensor needs to place a mass on the piezoelectric crystal, and in order to isolate any strain of the test piece from being transmitted to the piezoelectric element, it is generally necessary to thicken the base or use a material with higher rigidity to make it. The weight of the body and the base accounts for almost half of the weight of the sensor, and the actual effective parts account for less weight, and the piezoelectric material is a heavy metal material, and its material itself is a potential threat to the environment, and the piezoelectric acceleration sensor cannot Measure a signal at zero frequency

The sensitive core of the piezoresistive acceleration sensor is a semiconductor material, which is greatly affected by temperature; the capacitive acceleration sensor has a large impact on the cable capacitance and has a limited range.

Images