Hydrogel-based optical fiber temperature sensor and preparation method thereof

The invention relates to a hydrogel-based optical fiber temperature sensor and a preparation method thereof. The preparation method comprises the following steps: taking sodium alginate as a sheath layer spinning solution, mixing poly(N-isopropylacrylamide) (PNIPAM) with polyethylene glycol diacrylate (PEGDA), adding a photo-initiator, taking the photo-initiator as a core layer spinning solution,taking a transverse coaxial needle head as a spinning spinneret; taking a CaCl2 aqueous solution as coagulating bath, coagulating sodium alginate in the sheath layer, adding an ultraviolet light source, initiating free radical polymerization of monomer solutions in the core layer spinning solution; and drawing to obtain the hydrogel-based optical fiber temperature sensor. Through the preparation method, the hydrogel-based optical fiber temperature sensor with adjustable response temperature can be prepared by adjusting the ratio of PNIPAM and PEGDA. 本发明涉及一种水凝胶基光纤温度传感器及其制备方法，包括：海藻酸钠作为皮层纺丝液，PNIPAM和PEGDA混合，加入光引发剂作为芯层纺丝液，