An imaging apparatus is disclosed for combined temperature and luminescence spatial imaging of an object (1), such as a bio-array for detection of biological molecules. Light (5) is separated into a first (10) and a second (20) optical path, where the first optical path (10) guides infrared (IR), and the second optical path (20) guides luminescence light, preferably fluorescence light, from the object (1). Image intensifying means (30) converts infrared light (10a) in the first optical path into intensified light (10b), preferably visible light. Photo detection means (100) are arranged for spatial imaging of the object (1), the photo detection means being arranged for alternately receiving light from the first (10) and the second (20) optical path. Processing means (200) are capable of combining a temperature image (11) with a luminescence image (21) so as to obtain a combined image (25) of the object with a direct spatial correspondence between the two images. For bio-arrays this provides many advantages in relation to combined imaging of an array, whereupon numerous probe molecules are located.