Helmet-type electroencephalography cap based on optical crystals

Abstract

The invention discloses a helmet-type electroencephalography cap based on optical crystals. A lot of optical crystals (2) are arranged in a flexible helmet shell (1) are connected through optical fibers (4), flexible dry electrode arrays (3) are arranged on two electrodes of the optical crystals (2), a light source (5) provides input light waves, the input light waves pass a light coupler (6), enter first transmission optical fibers (7) and are connected with input ends of the optical crystals (2), output ends of the optical crystals (2) pass second transmission optical fibers (8), and modulated output light waves are received by a photoelectric detector (9) and finally transmitted to a processor (11) and a storage (12) by a signal processing module (10). Compared with the prior art, the electroencephalography cap effectively solves the problems that an existing electroencephalography detection system is easily interfered by electromagnetism and low in signal to noise ratio, the cap can be directly worn, coating of conductive paste is omitted, a flexible dry electrode has a certain elasticity, the flexible dry electrode can effectively contact with the head skin of a tested patient, discomfort of the tested patient is avoided, and the flexible dry electrode can be compactly arranged on needed head acquisition portion, so that the distribution states of electroencephalography signals are acquired.

Description

technical field [0001] The invention relates to an EEG signal detection device, in particular to a helmet type EEG cap based on the principle of optical crystal linear electro-optic effect. Background technique [0002] EEG is the overall reflection of the electrophysiological activities of brain nerve cells on the surface of the cerebral cortex or scalp. EEG signals contain a large amount of physiological and disease information. In modern clinical medicine, the monitoring of EEG signals is gradually applied in the daily civilian field, which not only provides a diagnosis basis for some brain diseases, but also provides effective treatment methods for some brain diseases. Scalp electrode EEG is generally used in clinical and daily monitoring, that is, the spontaneous electrical activity of the brain is amplified and recorded through electrodes from the scalp. [0003] At present, the general scalp electrode EEG detection method is to fix the metal electrode on the elastic ...

AI Technical Summary

Problems solved by technology

Under strong electromagnetic interference (such as strong electrical stimulation signals), signals detected by electrical methods will inevitably introduce noise artifacts or produce severe distortion, and there may be certain risks to the tester during the test

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