Abstract: We devise an optical fiber grating based temperature sensor for such issues as traditional electronic sensor failing to work in microwave field in bone tumor microwave hyperthermia, a probe apt to fracture when stuck into periosteum and to short life time. It includes a temperature sensing probe and a fiber grating multipoint temperature detector. Its special integration structure design and packaging technology and 0.5 mm wall thick probe improve its mechanical strength, especially for its probe. This guarantees its whole sealing performance.Stainless steel material extends its life time.Experimental results show that it has detection accuracy of±0.3 ℃ and temperature response time of 5 s.Clinical application demonstrates that it has high resolution of 0.01 ℃,high accuracy and reliability and strong electromagnetic interference suppression capability.

Key words: medical multipoint temperature detector, hyperthermia treatment, fiber Bragg grating, bone tumor