User`s manual

Chapter 1 Before Use
1-12
1
1-4 Measurement of transparent objects
Because the measured value for the closest reflected wave will be output from the
sensor when an HL-G1 series specular reflection-type unit measures a
multi-reflecting reflector such as transparent glass, only surface measurement is
possible.
To accurately measure the surface of a transparent object, it is necessary to separate
the reflected wave from the front surface and the reflected wave from the back
surface.
The following chart summarizes the thicknesses of glass that can be measured.
Model name HL-G103A-R□ HL-G105A-R□ HL-G108A-R□
Measurable glass
thickness (index
of refraction of
1.55)
0.7 mm or more 2.0 mm or more 4.0 mm or more