1. Biometric sensor apparatus comprising: a translucent platen having a first side against which a body member to be analyzed by the apparatus is placed, in use of the apparatus, and a second side; at least one IR light source located on the first side of the platen for transmitting light through the body member and the platen to the second side of the platen; an optical image sensor located on the second side of the platen for detecting light transmitted through the body member and the platen.