Hangzhou Lohand Biological Co.,Ltd Add: Zhejiang Hangzhou Jianggan 4F,Bldg 7,No.63,Jiuhuan Rd,Jiubao Town,Jianggan Dist Tel: +86-571-85050999 Mob: +8613123950066 E-mail: firstname.lastname@example.org
What is the principle of digital refractometer?
When the light enters another transparent medium from a transparent medium, the phenomenon of refraction occurs. This phenomenon is caused by the different speeds of light in different kinds of medium. The refractive index is the ratio of the speed of light in the air to the speed of propagation in other materials.
When the light enters the prism whose refractive index is N from the measured substance whose refractive index is n, the incident angle is i and the refraction angle is r, then:
Sin i / Sin r = N / n...........（1）
In the refractometer, the incident angle I = 90°, and the person (1) gets:
1 / Sin r = N / n
n = N · Sin r...................（2）
When the refractive index N of the prism is a known value, the refractive index n of the measured substance can be obtained by measuring the refraction angle r.
The ratio of the speed of light in the air to the speed of light in the sample or the ratio of the sine of the angle of incidence of air when the air passes through the specimen to the sine of the angle of refraction at the sodium spectrum D line at 20°C.
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