If the Refractive Index of air under atmospheric pressure is 1, then when
light enters medium χ, the ratio of the sine of the incident angle α
measured against the phase boundary to the sine of the refracting angle
β is called the Refractive Index of the medium χ.
The Refractive Index varies with the wavelength of light and
temperature and is represented as follows:
For example:
Refractive Index of water at 20
℃
under the D-line is:
= 1.33299: , (Generally expressed as
nD = 1.33299.)
n
:
Represents the Refractive Index
t
:
Temperature (
℃
)
D
:
D-line of natrium (589nm)
ZHYQ Sensor&Control Page 3 of 15
Working Principle
In-line Refractometer
Model : GND15
(
high temperature Application
)