Linear Acceleration Sensor Based on Otolithic Structure

Abstract

The invention discloses a linear acceleration sensor with an otolith-like structure, which consists of a rigid shell, a flexible elastic body, a plurality of piezoelectric fibers containing metal cores connected in parallel at the bottom of the rigid shell, and bonded to a flexible elastic body. The rigid element at the top of the body connects the rigid element and the elastic element of the external rigid shell, and the symmetrical electrode containing the metal core piezoelectric fiber is drawn out with two wires, and the two wires are respectively connected to the positive and negative poles of the input terminal of the charge amplifier. The whole device is fixed on the exciter. When the exciter vibrates up and down, the elastic element expands and contracts and drives the rigid element. At this time, the flexible elastic will undergo elastic deformation, and the piezoelectric fiber containing the metal core will also undergo elastic deformation, wrapped in the flexible elastic The piezoelectric fiber containing metal core in the body will get an impact signal. Due to the piezoelectric effect, the surface electrodes on the piezoelectric material are charged. Due to the different positions of the electrodes, the charges or voltages generated on the electrodes are different. In this way, we can obtain the acceleration information by collecting the charge signal on the electrode and analyzing the data.

Description

technical field [0001] The invention discloses a linear acceleration sensor with an otolith-like structure, which is a new type of sensor capable of measuring linear acceleration, with a relatively simple structure and high precision. Background technique [0002] As one of the components of the vestibular nervous system, the otolith organ, like the semicircular canal, has receptors, conduction nerve pathways and control centers. Like the semicircular canal, it has vestibular eye movement, vestibular spinal cord, vestibular cerebellum, vestibular autonomic nervous system, vestibular cortical pathway and corresponding reaction. Different from the semicircular canal system, its suitable stimulus is not angular acceleration, but gravity and linear acceleration. The functions of the otolithic system can be divided into three categories: (1) perception of spatial orientation and linear motion; (2) generation of compensatory eye movements for head linear acceleration; (3) partici...

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Problems solved by technology

Due to the limitations of this principle, it is determined that the test environment has high requirements and high cost, and it is difficult to meet the requirements for detecting linear acceleration.

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