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Based on the interferences between core modes and cladding modes in photonic crystal fiber (PCF),a novel temperature sensor is presented and experimentally demonstrated.The peak wavelength of the interference spectrum linearly increased with an increase in temperature.A measurement sensitivity of 10.38 pm/℃ was experimentally achieved for temperatures ranging from 30℃ to 100℃.Experimental results also indicate that the curvature and transverse load do not have a distinguishable influence on the transmission spectrum of the proposed fiber sensor,which ensures its applicability for practical applications.