Before grinding or polishing the fixed pitch propeller, we should first measure the morphology after the process of milling, so we can get the grinding allowance. I would like to know which online measurement can get it.
This is a routine industrial task, but the exact choice of metrology will depend on your tolerances, budget and desired throughput. For some examples of techniques, see the links. You may get further responses if you provide more detail of your inspection task.
http://www.npl.co.uk/science-technology/dimensional/services/freeform-surfaces/
http://www.npl.co.uk/publications/fundamental-good-practice-in-dimensional-metrology
Chris Jones pointed you at the UK's National Freeform Centre and that's a good place to start looking at scanning techniques.
Without more details, non-contact surface scanning which, as Chris says is a routine industrial task, could be a solution. You can scan using an area system (camera+projector) or with a line scanner on the end of a CMM arm.
An issue to be checked is the nature of the surface which, if highly polished, might not give a good result with some systems.
Depending on how detailed are your information requirement is, you could use contact probing at selected points with either a CMM arm or a laser tracker. You can even get a fairly detailed surface measurement with manual scanning of a tracker's reflector across the propellor's surface.
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