Chromatic confocal sensor and measurement method

A chromatic confocal sensor, comprising:

• a first light source that emits measurement light including a plurality of light beams having different wavelengths;
• a second light source that emits a visible light beam having a predetermined wavelength;
• an optical head that causes incident light to be converged at a focal position corresponding to a wavelength of the incident light and outputs reflection light reflected by an object to be measured at the focal position;
• a processor;
• and
• a memory including a set of executable instructions that, when executed by the processor causes the processor to perform operations including:
• calculating a position of the object to be measured on the basis of the reflection light output by the optical head;
• and
• selectively switching between a first operation in which only the measurement light enters the optical head and a second operation in which at least the visible light beam enters the optical head,
• generating, when the second operation is selected, a correction value used for calculating the position, on the basis of the reflection light obtained by the visible light beam being reflected by an object to be measured for correction at the focal position.