Optical measurement apparatus and endoscope system

An endoscope system comprising:

• an endoscope which includes an insertion tube configured to be inserted into an inside of a subject and which is configured to capture an image of the inside of the subject by an imaging unit provided in the insertion tube and generate an image signal;
• an optical measurement apparatus including a measurement probe configured to be inserted into the inside of the subject through the insertion tube;
• an endoscope light source configured to switch between observation light of a plurality of wavelengths and output the observation light to observe a target object via the insertion tube;
• a probe light source configured to output measurement light to measure characteristics of the target object via the measurement probe;
• a spectroscope configured to receive and disperse return light via the measurement probe, the return light being caused by at least one of reflection and scattering of the measurement light from the target object;
• and
• an optical controller configured to compute the characteristics of the target object based on results of dispersion by the spectroscope;
• and
• a central processing unit (CPU) configured to control the optical controller to remove, from the return light, a component of the wavelength band of the observation light outputted by the endoscope light source to compute the characteristics of the target object.