Photonic crystal fiber chemical/biological sensing head and preparation method thereof

Abstract

The invention discloses a photonic crystal fiber chemical / biological sensing head and a preparation method thereof. The photonic crystal fiber is of a tubular photonic crystal fiber, the inner wall of the tubular photonic crystal fiber is coated with sensing membrane which is sensitive to sample to be tested, and a sensing end of the photonic crystal fiber is closed by ultraviolet curing optical bond along axial cladding micro-pore canal. The method comprises the following steps that: ultraviolet curing optical bond is used for closing the cladding micro-pore canal of the tubular photonic crystal fiber, and a capillary absorption method is used for coating a membrane which is doped with fluorescent probe sol on the core of the tubular photonic crystal fiber. The sensing membrane is coatedon the inner wall of the fiber core, for the flow sample to be tested with the refractive index being more than the photonic crystal fiber medium, the photonic crystal fiber optical channel can guidethe laser in a total-reflection form, the strength of the laser for detecting the sample to be detected can exceed 80 percent, the effective inter-reaction length of the one micro-liter sample to be tested and the sensing membrane can reach decades of centimeters, and the sensitivity is far me than that of the conventional chemical / biological optical fiber sensor.

Description

technical field [0001] The invention relates to an optical fiber chemical / biological sensor, in particular to a photonic crystal optical fiber chemical / biological sensor head and a preparation method thereof. Background technique [0002] Optical fiber chemical / biological sensors have the advantages of high sensitivity, good selectivity, easy miniaturization, no electricity on site, and strong anti-interference ability. Novel instrumentation. The birth of photonic crystal fiber (photonic crystal fiber-PCF) has greatly promoted the development of chemical / biological sensors. There are two basic structures of photonic crystal fiber: solid core photonic crystal fiber and hollow core photonic crystal fiber. The common feature is that the cladding of the fiber is periodically arranged micro-holes. The concept of photonic crystal is essentially a dielectric material formed by the periodic distribution of dielectric constant in space. These mediums with periodic distribution str...

AI Technical Summary

Problems solved by technology

[0005] Traditional chemical / biological optical fiber sensors usually use conventional single-mode or multimode optical fibers as the transmission and sensing medium, and the sensing medium is generally coated on the end of the optical fiber or on the side of the optical fiber. The sensitivity of this traditional optical fiber sensor is limited, and the conventional optical fiber Sensitive to environmental factors, so the stability of traditional fiber optic sensors is poor

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