Optical measurement device and optical measurement method

An optical measurement device comprising:

• an orthogonal separation unit configured to orthogonally separate transmitted light in which linearly polarized light has passed through a test object;
• at least two light receiving units configured to receive light which is orthogonally separated in the orthogonal separation unit;
• and
• an optical rotation angle calculation unit including
• a transmitted light amount determination unit configured to determine amount of light of the transmitted light,
• an amplification factor setting unit configured to set a first amplification factor to the amount of light of the transmitted light and set a second amplification factor to a difference between received light levels which are received in the light receiving units, the first amplification factor and the second amplification factor being different from each other,
• an amplification unit configured to amplify the amount of light of the transmitted light with the first amplification factor and the difference between the received light levels with the second amplification factor, and
• a controller configured to calculate an angle of optical rotation after normalizing the difference between the received light levels using the amount of light of the transmitted light.