Temperature and direction recognizable curvature sensing optical fiber and manufacturing and using method thereof

Abstract

The invention belongs to the field of optical fiber sensing, and mainly relates to a temperature and direction recognizable curvature sensing optical fiber. A double-clad D-shaped multimode optical fiber with a semi-circular quartz cladding and an annularly-clad low-refractive-index plastic cladding is prepared through precision side grinding of an optical fiber preform and secondary pressure coating; the coating layer and the plastic cladding are mechanically peeled off, an SPR sensing film is plated, the restored optical fiber is reshaped by using a low-refractive-index liquid or a low-refractive-index coating adhesive, and an SPR sensing module is manufactured on the restored optical fiber; the optical fiber is novel and stable in structure, and high in bending performance, liquid and solid environment temperature measurement can be carried out through the resonance wavelength; multi-point simultaneous measurement based on the wavelength division multiplexing technology can also becarried out; curvature measurement, bending direction judgment and multi-point simultaneous measurement based on the wavelength division multiplexing technology can be carried out through two parameters of resonance wavelength and resonance valley depth, and the optical fiber and the method have a good application prospect in the fields of biomedicine, electronic chip monitoring, three gorges reservoir area landslide, reservoir banks and other geological environment monitoring.

Description

technical field [0001] The invention belongs to the field of optical fiber sensors, and in particular relates to a temperature and direction-identifiable curvature sensing optical fiber and a method for making and using it. Background technique [0002] Surface plasmon resonance (SPR) sensors have the advantages of small size, high sensitivity, resistance to electromagnetic radiation and interference, and long-distance measurement. They are widely used in food safety, biomedicine, and environmental monitoring. The principle is: when a light wave shoots from an optically dense medium to an optically sparse medium, reflection and refraction will occur at the interface of the two media. If the incident angle is greater than the critical angle, no refraction will occur, and the energy of the reflected light wave is equal to that of the incident light wave. , this phenomenon is called total reflection. When total reflection occurs, after the incident light hits the interface betw...

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Problems solved by technology

[0007] In view of this, the object of the present invention is to provide a temperature and direction-recognizable curvature sensing optical fiber and a method for making and using it. The present invention can solve the problem that the stability of the sensor decreases due to the stripping of the coating layer and the cladding of the traditional optical fiber. , the present invention can also be placed in a PDMS microfluidic chip, which solves the difficulty of placing a fiber optic microfluidic channel thermometer and cannot measure the temperature in the microfluidic channel and other positions in real

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