NEAR-INFRARED SPECTROSCOPY BASED IMAGING METHOD FOR LIQUID DETECTION

摘要

The invention relates to an imaging method by means of near-infrared spectroscopy for liquid detection in an encapsulation sample (2, 10), comprising the following steps: arranging a radiator in a beam path, the radiator being designed as a broadband radiator or as an LED or as a laser radiator, in which case when a broadband radiator is used as the radiator, a first band-pass filter (6) which is transparent only to wavelengths in the range of spectral absorption of the liquid of the sample is disposed in the optical path; Candling or irradiating the sample by means of the radiator (1) with near-infrared radiation and producing a first image acquisition by means of a camera (7); Taking a second image capture without the sample; optionally removing the first bandpass filter (6); in the case where a broadband radiator is used as the radiator, a second band pass filter (8) which is transparent only to wavelengths outside the range of spectral absorption of the liquid of the sample is placed in the optical path; Scanning or irradiating the sample with near-infrared radiation and taking a third image acquisition by means of the camera (7); Creating a fourth image capture without the sample; pixel-wise numerically linking the images by the following relationship: where IM represents an image representation of the qualitative distribution of the liquid contained in the sample.