Human-machine Interface Based On Single-element Ultrasound Transducers

In recent decades,in the area of prosthesis control,researchers have put forward many kinds of human-machine interface(HMI)based on different types of sensors.However,these HMIs have not been so perfect so commercial prostheses are still based on simple on-off control at present.In order to explore new ways of controlling prostheses,this paper introduces a new kind of HMI based on multi-channel single element ultrasound transducers.First of all,this paper takes an overview of mainstream HMIs for prosthesis control and analyzes the characteristics of each kind.Theoretical analyses as well as the concept design of the HMI are planned.Verification experiments using a substitute equipment are carried out and the result proves that the signal acquiring method and processing algorithms are effective for extracting muscle information.Current ultrasound transducers are not suitable to use as the sensors here,so a specially-made single element transducer for prosthesis control is designed in this paper.By discussing the influence of the structure and design parameters for the transducer and carrying out tests with prototypes,the optimized transducers are finally developed.Using the experiment platform set up in this paper,a finger gesture recognition experiment is carried out.The recognition accuracy turns out to be 96.8%±1.8% and proves that the HMI proposed in this paper is capable of recognize dexterous motions.