Cerebral tissue oxygen monitoring equipment based on near infrared spectroscopy（NIRS） is originally used to monitor oxygen saturation in surgery or intensive care.Different from traditional blood gas analyzer and finger pulse oximeter

NIRS can quantitatively monitor cerebral blood oxygen parameters in a non-invasive

continuous and real-time manner.In last decade

with the development of photoelectric sensing and measurement technology

functional near infrared brain imaging equipment is widely used in basic cognitive neuroscience research

mental disease diagnosis and other fields.Firstly

basic principle of monitoring blood oxygen parameters of cerebral tissue and functional brain imaging based on NIRS is introduced.Secondly

the latest research progress of brain oxygen monitoring and functional brain imaging is introduced from the aspects of sensor structure

signal separation

extraction and processing methods

and quantitative inversion algorithm of blood oxygen parameters.Finally

its practical application is prospected.