NOVELTY - Laminating objects to be encapsulated, preferably solar cells (15), comprises: (a) embedding the objects in cross-linkable polymeric material; (b) compressing the embedded cross-linkable polymer material objects; (c) heating the cross-linkable polymeric material; (d) illuminating the cross-linkable polymeric material with the light; (e) detecting fluorescence light having a wavelength in an absorption region; and (f) deriving information about a state of crosslinking of the cross-linkable polymeric material based on the detected fluorescent light.    USE - The method is useful for laminating objects to be encapsulated, preferably solar cells.    ADVANTAGE - The method: is simple; and allows protection of the solar cells and their electrical connections against moisture, thus it prevents corrosion and enables easy handling and attachment of solar cells.    DETAILED DESCRIPTION - Laminating objects to be encapsulated, preferably solar cells (15), comprises: (a) embedding the objects in cross-linkable polymeric material; (b) compressing the embedded cross-linkable polymer material objects; (c) heating the cross-linkable polymeric material to more than 120 degrees C; (d) illuminating the cross-linkable polymeric material with the light having a wavelength in an emission range of 320-400 nm; (e) detecting fluorescence light having a wavelength in an absorption region of 400-600 nm from the illuminated cross-linkable polymer material; and (f) deriving information about a state of crosslinking of the cross-linkable polymeric material based on the detected fluorescent light. The steps (d)-(f) are carried out during or after heating of the cross-linkable polymeric material to more than 120 degrees C. INDEPENDENT CLAIMS are also included for:    (1) a device (1) for laminating the objects to be encapsulated, preferably solar cells, comprising a lamination device (2) which comprises a pressing device to compress the objects and a heater for heating the embedded objects, a monitoring which comprises an illumination device to illuminate the objects surrounding cross-linkable polymer material with light, a detection means having a wavelength in an absorption region of 400-600 nm to detect the fluorescence light from the illuminated cross-linkable polymer material, and an evaluation device to determine information about a state of crosslinking of the cross-linkable polymeric material based on the detected fluorescent light; and    (2) an apparatus for determining an information on a state of cross-linking of the cross-linkable polymeric material, comprising a first illuminating device to illuminate the objects surrounding cross-linkable polymer material with a first light having a first emission wavelength of 320-400 nm, a second illuminating device to illuminate the objects surrounding cross-linkable polymer material with a second light having a second emission wavelength of 400 nm, detection device for detecting reflected light, effected with a wavelength of 400 nm on each of the illuminated cross-linkable polymer material, effected by the first light and fluorescent light by the second light, and an evaluation device to determine information about a state of cross-linking of the cross-linkable polymeric material based on detected fluorescent light and based on detected reflected light.    DESCRIPTION OF DRAWING(S) - The figure shows a device for laminating solar cells to be encapsulated.    Device (1)    Lamination device (2)    Solar modules (3)    Housing (5)    Solar cells (15)