signal composed of the stray light entering the discrimination pinhole, sensed by the detector when no sample is present, and the internal signal produced by the detector itself, signaal, mis koosneb eristamisnõelavasse sisenevast hajuvvalgusest, mida detektor tuvastab, kui proovi/mõõteobjekti pole, ja detektori enda tekitatud sisemisest signaalist