Research And Development Of Non-invasive Real-time Detection System For Skin Tissue Viscoelasticity

With the development of economic level and consumption concept,people are paying more and more attention to health condition of skin.Fitness and beauty is taking more and more attention in daily lives.People can even do more from the real-time selfbased parameters to evaluate their skin condition,they can record the digitized state of skin,trace the changing point when heath problems occur,prevent further problems from happening.Based on the forced vibration principle of one degree of freedom and its KelvinVoigt model,a noninvasive method for skin viscoelasticity detection was established.The optimum frequency,the optimum amplitude,the optimum depth and the effective mode of the printing and stamping system are explored,provides a theoretical basis for the development of portable skin viscoelasticity detection device and the real-time measurement of skin viscoelasticity.A portable skin viscoelasticity detection device was designed and developed.The detection device applies the periodic displacement of the system to the skin tissue through a press head,detects the displacement signal and pressure signal.A performance test of portable skin viscoelasticity testing device was carried out with pigskin tissue as the experimental material and wdw-200 e electronic universal testing machine as the comparative experimental device.The experimental results show that the experimental results of this device are in good agreement with those of the electronic universal testing machine.A portable skin viscoelasticity detector was used to test 40 subjects of different ages and genders in vivo.The relationship between skin viscoelasticity and sex,age,arm load,and exercise degree was discussed with the skin at the position of 10 mm from the inner axis of the arm.The results showed that the skin viscosity and elasticity of the male experimenter's arm at the same age were greater than that of the female experimenter's arm,which meant that the skin viscoelasticity of the male was generally greater than that of the female at the same age.The experimental results showed that the skin viscoelastic characteristics were high in the age group before 30 years old,and there were some individual differences.However,after the age of about 30 years old,with the growth of age,the viscoelasticity coefficient of skin tissue shows a stable linear downward trend,and the decrease of the viscoelasticity coefficient is greater than that of the viscosity coefficient.In addition,daily arm and weight-bearing stretching exercises are helpful to increase skin viscoelasticity,but the weight should be moderate.This study initially explored the relationship between human skin viscoelasticity and gender,age,arm load,exercise degree and other factors,and drew a useful conclusion.But overall,the number of experimenters was small.In the future,the number of experimenters will be expanded to minimize the impact of individual differences on experimental results.