论文部分内容阅读
采用多个滚筒组合电极对皮肤表面低阻抗点进行探测,可以获得一种压力张弛效应。它在一定程度上克服了普通单滚筒电极在测量时出现的随作用在电极上的压力不同所产生的接触面积的变化。理论和实验表明,恒流皮肤低电阻点的测量与恒压测量相比可以降低热效应所产生的偏差。并且能获得更稳定的测量值。皮肤电阻探测时,在皮肤表面上角质层直流电阻大。因而大部分的功率都消耗在它上面。在恒定直流电流源测量时,当皮肤电阻随着热效应下降时,其耗散功率也随之下降。这样由热效应引起的皮肤电阻下降就会迅遗停止。而在恒定直流电压源测量时,皮肤电阻的下降反而导致其耗散功率的上升,从而造成皮肤电阻的继续下降。实验结果表明,恒流测量时,所测得的皮肤电阻值随
Using multiple roller combination electrodes to detect low impedance points on the surface of the skin, a pressure relaxation effect can be obtained. To a certain extent, it overcomes the change of the contact area caused by the pressure difference on the electrode which occurs in the measurement of an ordinary single-roller electrode. Theoretical and experimental results show that the measurement of low resistance point of constant current skin can reduce the deviation of thermal effect compared with constant voltage measurement. And can get more stable measurements. Skin resistance detection, the skin surface of the stratum corneum DC resistance. So most of the power is consumed on it. When measured at a constant DC current source, as the skin resistance decreases with thermal effects, the dissipated power also decreases. This decline in skin resistance caused by the thermal effect will quickly stop. In the measurement of a constant DC voltage source, however, the decrease of the skin resistance leads to the increase of the dissipated power, which leads to the continuous decrease of the skin resistance. The experimental results show that the measured skin resistance value with constant current measurement