Near Infrared Brain function measuring instrument and measurement method

摘要

Provided is a multichannel near infrared brain measuring apparatus which is simple in leveling detector noise. The transmittance of all the optical attenuators is set to 1 and the intensity of all the light sources is set to the maximum amount of light that can safely be irradiated, and the effective incident light amount of the light source probe i of each steel, the minimum effective incident light amount thereof, And the transmittance a _i of the optical attenuator i on the side of the light source probe is changed to [the minimum effective incident light amount / the effective incident light amount of the light source probe i] to equalize the effective incident light amount, The effective detection efficiency of the detector probe j and the minimum effective detection efficiency thereof are obtained, and the transmittance a _j of the optical attenuator j on the detector probe side is calculated by multiplying W = [the maximum effective incident light amount / the minimum effective incident light efficiency] [Effective detection efficiency of the minimum detection efficiency / detector probe j] is controlled so that the effective detection efficiency is leveled, A leveling chulgi noise near infrared brain function measuring device.