激光二极管微振动传感器在肌肉震颤检测中的应用

Laser Diode Microvibration Sensor and Applications in Muscle Vibration Measurement

为了实现肌肉震颤的光学探测 ,本文设计并研制了一套基于光反馈效应的直接频率调制激光二极管微振动传感器。微弱机械振动信号的探测结果表明 ,该系统能实现无接触测量。在此基础上 ,对人体前臂内侧屈肌群紧张收缩时的肌肉震颤进行了非接触测量 ,研究了肌肉震颤的特性 ,研究结果提示 :最大自发收缩量是肌肉收缩的固有能力 ,而肌肉震颤的峰值频率是肌肉的固有属性 ,这两者是从相互独立的不同的侧面反映肌肉的特征 ;肌肉震颤的幅度是肌肉在施力情况下的一种反应 ,在一定的限度内这种反应与肌肉的能力之间没有明显关系。

A microvibration sensor based on the optical feedback effect in a direct frequency modulated laser diode is developed for optical detection of muscle vibration.The low frequency,weak mechanical vibration experiments show that detection system can realize the non-contact measurement.Then human muscle vibrations of the forearm inner flexor cluster during tension contract measured by the detection system are presented.The statistical results show that the maximum voluntary contraction(MVC) of the muscle is its intrinsic ability,and peak frequency of muscle vibration is its intrinsic property.Both MVC and peak frequency reveal the muscle characteristics from different sides.The amplitude of vibration is a response of muscle during application of force.There is no relation between the response and muscle ability in some extent.