Recent content by WaltLankor

Thanks for the reply. I shall look into it.

Homework Statement For a Helicopter landing on an undercarriage system modeled as a single spring damper. In principle, is it possible to determine K and C values for a single (constant rate) spring damper system given the mass of the helicopter and 2 independent scenarios of initial...

Apparently Opacity can be defined as 'mass attenuation coefficient', which is the sum of scattered and absorbed light, so opacity can be a function of reflectance in effect. http://en.wikipedia.org/wiki/Opacity_(optics ) Anyway the author of the text in question has clarified the sentence...

Thanks That is my understanding of the situation too.

Indeed that was my understanding and I would have put the reference from the metrology test down to a misprint if I had not found several references quoting definitions for Opaque as being dependent on lack of reflectance. Thanks for the reply.

I'm puzzled. In an authoritative metrology text I read. "Focus detection instruments cannot be used to measure 'opaque' surfaces" as they require a finite level of reflected light to function. Non transmittance being (to my understanding) the key definition of "opaque", I looked up the...