A photothermal examination method of a part, the method comprising a first sequence having the following steps: - step 11: scanning a first zone of a surface of the part with a first heat input element, the scanning being done along a plurality of lines substantially parallel to a first direction; - step 12: acquiring an image of the infrared radiation emitted by said first zone using a first photosensitive surface element; the method further comprises the following steps: - step 13: scanning a second zone of the surface of the part with a second heat input element, the scanning being done along a plurality of lines substantially parallel to a second direction; - step 14: acquiring an image of the infrared radiation emitted by said second zone using a second photosensitive surface element; the method further comprising at least one second sequence having the following steps: - step 21: scanning the second zone of the surface of the part with the first heat input element, the scanning being done along a plurality of lines substantially parallel to the first direction; - step 22: acquiring an image of the infrared radiation emitted by said second zone using the first photosensitive surface element; - step 23: scanning a third zone of the surface of the part with the second heat input element, the scanning being done along a plurality of lines substantially parallel to the second direction; - step 24: acquiring an image of the infrared radiation emitted by said third zone using the second photosensitive surface element; each zone of the surface of the part is scanned during a sequence with the first heat input element along a plurality of lines parallel to the first direction, and during another sequence with the second heat input element along a plurality of lines parallel to the second direction, images of the infrared radiation emitted by said zone being acquired by the first photosensitive surface element during said sequence and by the second photosensitive surface element during said other sequence; the second direction forms a first non-zero angle (α) with the first direction, said first angle (α) preferably being larger than 30°; the first and second heat input elements (54, 60) are generated by a laser with a defined geometric shape; the first and second zones (50, 58) are scanned simultaneously; the second and third zones being scanned simultaneously; the first and second photosensitive surfaces (56, 62) being separate from one another. - step 11: scanning a first zone of a surface of the part with a first heat input element, the scanning being done along a plurality of lines substantially parallel to a first direction; - step 12: acquiring an image of the infrared radiation emitted by said first zone using a first photosensitive surface element; - step 13: scanning a second zone of the surface of the part with a second heat input element, the scanning being done along a plurality of lines substantially parallel to a second direction; - step 14: acquiring an image of the infrared radiation emitted by said second zone using a second photosensitive surface element; - step 21: scanning the second zone of the surface of the part with the first heat input element, the scanning being done along a plurality of lines substantially parallel to the first direction; - step 22: acquiring an image of the infrared radiation emitted by said second zone using the first photosensitive surface element; - step 23: scanning a third zone of the surface of the part with the second heat input element, the scanning being done along a plurality of lines substantially parallel to the second direction; - step 24: acquiring an image of the infrared radiation emitted by said third zone using the second photosensitive surface element; each zone of the surface of the part is scanned during a sequence with the first heat input element along a plurality of lines parallel to the first direction, and during another sequence with the second heat input element along a plurality of lines parallel to the second direction, images of the infrared radiation emitted by said zone being acquired by the first photosensitive surface element during said sequence and by the second photosensitive surface element during said other sequence; the second direction forms a first non-zero angle (α) with the first direction, said first angle (α) preferably being larger than 30°; the first and second heat input elements (54, 60) are generated by a laser with a defined geometric shape; the first and second zones (50, 58) are scanned simultaneously; the second and third zones being scanned simultaneously; the first and second photosensitive surfaces (56, 62) being separate from one another. each zone of the surface of the part is scanned during a sequence with the first heat input element along a plurality of lines parallel to the first direction, and during another sequence with the second heat input element along a plurality of lines parallel to the second direction, images of the infrared radiation emitted by said zone being acquired by the first photosensitive surface element during said sequence and by the second photosensitive surface element during said other sequence; the second direction forms a first non-zero angle (α) with the first direction, said first angle (α) preferably being larger than 30°; the first and second heat input elements (54, 60) are generated by a laser with a defined geometric shape; the first and second zones (50, 58) are scanned simultaneously; the second and third zones being scanned simultaneously; the first and second photosensitive surfaces (56, 62) being separate from one another.