Abstract: An inspection tool (100) for inspection of a concrete surface (180), the tool comprising a vision-based sensor (110) arranged to be directed at a section of the concrete surface (180), guiding means (120) for allowing an operator (170) to move the vision-based sensor (110) over the concrete surface (180), a trigger (130) arranged to receive a command from the operator (170), wherein the vision-based sensor (110) is arranged to capture at least one image of the concrete surface in response to the command, a control system arranged to analyze the at least one image of the concrete surface in terms of a surface quality of the section of the concrete surface (180), and a display unit (140) arranged to present a result of the surface quality analysis to the operator (170).

Abstract: A front-illuminated avalanche photodiode (APD) includes an opening (16) for incident light, a number of various semiconductor layers from the opening and downwards including a multiplication layer (7), a field-control layer (8) and an absorption layer (10), where the absorption layer is arranged to absorb photons. Under the absorption layer (10) there is at least one Bragg mirror (14) arranged to reflect photons, that have passed the absorption layer (10) from the opening back to the absorption layer.