Sensor externally-coupled crosstalk (ECC) calibration.

Top: Scatter plot of residual gated signal, collected during an ambient temperature ramp from 40°C to 4°C, under dark conditions. The residual signal due to the ECC effect is observed to be directly proportional to the raw amplifier voltage, which is in turn linearly proportional to sensor’s dark current. The shutter flag modulates the ECC coupling ratio from the sensor back to itself, by blocking and unblocking the reflective sample cavity. The magnitude of the effect represents approximately 150 RLU of correlated error over the recorded temperature range. Bottom: Residuals from the linear fit to the data, showing no evidence of bias across the range of sampled temperatures.

(TIF)