Ametek 1400700, Руководство пользователя

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16 1400700-101 Rev. A
What is refractometry?
(continued)
Comment
In the paragraph above you read that using the auxiliary quantity “makes it easier to handle the
polynom. For the sake of completeness the coefficients for the third-order polynomial with the auxil -
iary quantity“ are listed in the following:
c
1
= 12.093
c
2
= 707.774
c
3
= 1736.434
c
4
= 3301.961
… all others are zero
Accordingly, if you compute with using the refractive index:
c
1
= 11783.327
c
2
= 22849.207
c
3
= 14911.260
c
4
= 3301.961
… all others are zero
Not only that the coefficients are more “unhandy“, bigger numbers are used as well. If you, by way
of example, calculate the two polynoms step by step you will get for the one with the auxiliary quan-
tity r = 0.051149.
Brix = -2.093 + 36.202 - 4.543 + 0.442 = 30.008
And for the one with the according refractive index ri = 1.381149
Brix = -11783.327 + 31558.159 - 28444.310 + 8699.485 = 30.007
Refractometry
(continued)