Theoretical Foundations - Zuzi 300 Serie Manual De Instrucciones

Automatic Temperature Compensation
(ATC) system:
When using models provided with auto-
matic temperature compensation (ATC), it is
not necessary to look up the attached charts
to correct the measuring according to the
working temperature, since this compensa-
tion is made automatically by the instrument.
This system makes possible to measure the
concentration of a solution without taking
into account the temperature.

4. THEORETICAL FOUNDATIONS

Refractometry
When a light beam reaches the surface of
separation between two different environ-
ments, part of this light is reflected and the
rest of it is refracted (it goes in the second
environment), propagating with a different
angle and speed than in the first environ-
ment. These two magnitudes can be characte-
rized by means of the refractive index, which
is a characteristic value for each substance.
Figure 3
incident
ray
MEDIUM A
MEDIUM B
The refractive index is related to the mass,
the load and the number of particles of the
substance through which the light radiation is
transmitted.
refractometers but most of them are based on
the same principle.
An example that explains clearly the phe-
nomenon of refraction is what happens when
we introduce a pencil into a glass filled with
water: the part of the pencil that is dipped into
the water seems to be bent with regards to the
other part that is out of the water. This is the
phenomenon of light refraction. If we submer-
ge the pencil in hot sugar-saturated water the
point of the pencil seems to be even more bent.
Version 7 Feb 2011
There are different kinds of
Manual 5030XXXX
I= incident angle
r= refractive angle
N= normal
refracted
angle
Page 27