Patent ID: 8558164

Claim:
An optical measurement system for measuring scattering light using a plurality of light-receiving fibers, each of which outputs, from a base end, light incident from a leading end, the optical measurement system comprising: a probe having the plurality of light-receiving fibers and an irradiation fiber that emits, from a leading end, light supplied from a base end; a calibration member having a fluorescent body that emits fluorescent light using excitation light having a wavelength belonging to a wavelength band different from a scattering light measurement wavelength band, the calibration member being used while the excitation light is in a position to irradiate the fluorescent body; an excitation light source that supplies, to the irradiation fiber, excitation light having a wavelength belonging to a wavelength band different from the scattering light measurement wavelength band; a measurement unit that measures each light output from the plurality of the light-receiving fibers; and a calibration processing unit that calibrates a relation of a received light intensity between the plurality of the light-receiving fibers based on a measurement result obtained in the measurement unit by measuring light output from the plurality of the light-receiving fibers for fluorescent light from the fluorescent body emitted by irradiation with the excitation light.