Embodiments of the present invention provide a system and method for detecting the level of a fluid in a surgical cassette by projecting light from a linear light source into a wall of a cassette. Depending on the amount a light reflected or refracted in the cassette (i.e., due to the cassette material/fluid interface or cassette material/air interface (or other interface)) various portions of a linear sensor array will be more or less illuminated. By examining the illumination of the linear sensor array, the level of fluid in the chamber can be determined.本發明之實施例提供一種經由從一線性光源投射光進入一卡匣之壁內部來檢測於一手術卡匣內部之流體位準之系統及方法。依據卡匣中(亦即由於卡匣材料/流體介面或卡匣材料/空氣介面(或其它介面))之折射光或反射光數量決定,一線性感測器陣列之各個不同部分將被較多或較少照明。經由檢驗該線性感測器陣列的亮度,可測定於腔室內之流體位準。500...卡匣502...主控台504...腔室506...線性光源508...線性感測器陣列510...控制器512...類比至數位(A/D)轉換器514...數位至類比(D/A)轉換器516...處理器518...電腦可讀取記憶體520...指令集521...光束