Limb joint angle measuring device and method based on optical fiber optical grating

Abstract

The invention discloses a limb joint angle measuring device and method based on an optical fiber optical grating, and aims at solving the problems of complicated joint angle acquisition device and high cost. The device and method have the advantage that limb joint angles can be obtained through the wavelength variation of the optical fiber optical grating. The device is characterized by comprisinga detachable wearing component which can be worn on the body, an optical fiber optical grating strain sensing unit which is arranged on the wearing component, an optical fiber optical grating demodulation instrument which is used for collecting wavelength of the optical grating in the optical fiber optical grating strain sensing unit and a controller which is connected with the optical fiber optical grating demodulation instrument, wherein the collected wavelength data is transmitted to the controller by the optical fiber optical grating demodulation instrument, and the limb joint angles areobtained by the controller according to the wavelength data.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a device and method for measuring limb joint angles based on fiber gratings. Background technique [0002] Limb joint angle measurement is widely used in the field of medical devices, and as an important feature of behavior recognition, it is of great significance to the realization of human body behavior recognition. The existing joint measurement mainly includes video method, inertial sensor method and piezoelectric sensor method. [0003] The video method uses image processing technology to analyze various postures of the human body. The image collection can be taken by multiple cameras, or by a single camera at different angles relative to the human body. Reconstruction is used to analyze the motion state and position information, and the joint angle of a certain limb can be determined through the position information. This method has high requirements on the accuracy of the ...

AI Technical Summary

Problems solved by technology

In the prior art, a three-axis accelerometer, a three-axis magnetometer, and a three-axis gyroscope are used to integrate the three together to form a real-time measurement system for wearable joints. structure, it is cumbersome to wear, and it is not suitable for excessive exercise, and the computational complexity of the wearable processing chip is high

There is also a comprehensive collection of piezoelectric information of the elbow joint control group during human movement, and analysis and extraction of various parameters of the elbow joint control group during the process, so as to obtain the approximate range of the angle. This method is not accurate and difficult to implement. Larger, difficult to industrialize

[0004] In addition to the above-mentioned traditional joint angle measurement methods, there is also a basic framework for human motion analysis and modeling based on human kinematics, dynamics, and physiology (myoelectricity) multi-information fusion in the prior art, using high-speed camera systems, force sensors The system and wired electromyography instrument build a platform for obtaining comprehensive human body information. This systematic method pays attention to the comprehensive overall human body posture, and the joint angle is deduced from the human body posture, which is prone to multiple error elements; Encapsulate, add electrodes, tie to the joints of the lower limbs, and obtain the joint movement angle according to the resistance change of the eutectic gallium indium during the joint movement. This method is expensive, the main material is not common, and the preparation process is complicated.

[0005] In general, the inventors found that the measurement of limb angles in the prior art has the problems of low measurement accuracy, complicated preparation process, and difficult industrialization

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