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A polarimeter measures the direction and extent of the polarisation plane rotation. Depending on the type of instrument, the analyser is rotated manually or automatically until the maximum intensity of the light falls on the detector.
Polarimetry is used to analyze chiral substances and determine their concentration in solutions. It is applied in quality control, laboratory analytics, as well as in R&D in the pharmaceutical, cosmetics, chemical, food, and medical industries.
The pH meter is basically a high impedance amplifier that accurately measures the minute electrode voltages and displays the results directly in pH units on either an analog or digital display.
A polarimeter is a scientific instrument used to measure the angle of rotation caused by passing polarized light through an optically active substance. . The amount by which the light is rotated is known as the angle of rotation. The angle of rotation is basically known as observed angle.
The basic operation principle of a polarimeter comprises the following: One generates light with an accurately prepared linear polarization state, usually by passage through a polarizer. That light is sent through the optically active sample, which somewhat rotates the polarization direction.