Method for controlling optical property measurement system

A method for controlling an optical property measurement system wherein optical properties of a liquid sample accommodated in a sample cell are measured by projecting a first light to the liquid sample to analyze light transmitted through the liquid sample, the method comprising the steps of:

• projecting a second light to a path or a periphery of the path of the first light to detect a presence or absence of at least one of bubbles and particles in the sample which may interfere with transmission of the first light projected to the sample, based on an intensity of the second light, and
• removing the at least one of bubbles and particles in the sample from the path of the first light projected to the sample upon detection of the presence of at least one of bubbles and particles,
• wherein the first light and the second light overlap while being projected to the liquid sample, and
• wherein the second light has a greater diameter than a diameter of the first light such that the second light covers the first light.