Table 3.

LOD of the ATR-FTIR reference setup & monolithic QCLD-sensor

Sensor/value	Avg. time (s)	Std(t) (mV)	LOD (mV)	Slope m [0–25 mg/ml]	LOD $\left(\frac{\mathrm{mg}}{\mathrm{ml}}\right)$, ppm by weight
ATR-FTIR	11	–	–		~9, ~9000
QCLD	11	0.031 ⇒ 0.092		$-0.4\frac{\mathrm{mV}}{\mathrm{mg/ml}}$	0.075, 75

LOD calculated for BSA in D₂O.