Tony Li explains that not all phenomena are suited to being displayed in a linear format like electrical resistance and pulse rates. The marvelous thing about sensors is that they can detect a great variety of physical and chemical changes and convert them into signals in the form of electical voltage or resistance, that can then be conveniently measured, analyzed and transmitted.
李棟樑解釋，比起電阻、心跳等慣常以線性呈現、目標單純的量測標的，「感測」的奧妙就在企圖感知千變萬化的物理或化學變化量，然後轉化成為電壓、電阻等電的訊號，以方便量測、分析及傳輸。