Most of those are fixed light source-detector , so it can only monitor the change of blood oxygen metabolizing in a certain depth.
广泛采用的光源与探测器间距固定的装置，只能反映组织特定深度的血氧信息；
In many test applications, the voltage and light output of the diode can be measured simultaneously using a fixed source current value.
在很多测试应用中，二极管的电压和发出的光可以利用大小固定的电流源同时测出来。
In many test applications, the voltage and light output of the diode can be measured simultaneously using a fixed source current value.
在很多测试应用中，二极管的电压和发出的光可以利用大小固定的电流源同时测出来。
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