D=OUTSIDE DIAMETER	Y=EDGE POSITION	Y(a)=CAM PROFILE
D= MULTIPLE WIRE DIAMETER	GAP MEASUREMENT	Ymax-Ymin=RUNOUT
(Dx+Dy)/2=AVERAGE DIAMETER [Dx+Dy]=OVALITY	Dmax-Dmin=OVALITY	POSITION AND GAP
Y2-Y1= FILM THICKNESS	LARGE DIAMETER D = L0-L1-L2

The separation surfaces between glass and air are opaque and can be detected : the distance between the first and the last edge is the external diameter dimension. A special signal processing software (glass logic) ignores all signal included within these extreme edges. The internal diameter cannot be reliably detected and it is impossible to be measured.

The “Blistbuster” software is an Aeroel exclusive data processing algorithm, installed in the dual axis sensors, that can be very useful to check the diameter smoothness of a continuous product (for instance magnet wire) and to detect a very special type of recurrent flaws, commonly called “Blisters”.

more details

ROUNDNESS
	The roundness or triangular shape error is the max. difference between ideal circle and actual cross section profile. The diameter of the ideal circle is impossible to know by rotating the part without fixing a rotation centre.

THICKNESS
A small misalignment affects the thickness measurement: S' = S cos a + L sin a For small angles the measured value is: S' = S + L sin a . and the error L sin a can be very large.

POSITION OF A FLAT SURFACE
	The position of a flat surface is difficult to be measured with high accuracy, due to complex reflections of the focused laser beam

HOLE OR DIE DIAMETER
The diameter of a hole (die) is very difficult to be measured, because of the tight alignment required and the reflections in the hole.

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