M-Z type hydrogen sensing head based on femto-second laser micro-machined hollow PBGF with written-in LPGs

Abstract

The invention relates to an M-Z type hydrogen sensing head based on a femto-second laser micro-machined hollow PBGF with written-in LPGs. The hydrogen sensing head is characterized in that the hydrogen sensing head is composed of a hollow PBGF (1), a palladium alloy membrane (3), and a second LPG (4); a first LPG (2) and the second LPG (4) are respectively written on the two ends of a segment of the hollow PBGF (1) by using femto-second laser; the palladium alloy membrane (3) is plated on the segment of the hollow PBGF (1) between the first LPG (2) and the second LPG (4) through rotary plating; when light is transmitted from the fiber core on one end of the hollow PBGF (1) through the first LPG (2), the first LPG (2) generates a plurality of cladding modes entering the clad of the hollow PBGF (1), and the palladium alloy membrane (3) can sense the variation of the hydrogen concentration in the exterior environment and thus generates surface plasma waves, such that the intensity variation of the cladding mode of the hollow PBGF (1) is influenced; when the cladding modes enter the second LPG (4), the second LPG (4) couples the cladding modes into the fiber core of the hollow PBGF (1); the cladding modes are subject to interferences with the light in the fiber fore, such that an M-Z structure is formed; the exterior environment hydrogen concentration and the variation thereof are obtained by monitoring the variation of the interference fringes. The sensing head is advantaged in simple structure, high sensitivity, and the like. The sensing head is suitable to be used in hydrogen concentration detections in various environments.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

AI Technical Summary

Benefits of technology

This technology allows for precise detection with an optical device called a microscope that uses light waves instead of X-rays or other types of radiation. It also includes various techniques like atomic force microscopy (AFM) which can be applied directly onto the sample without any extra steps needed during analysis. Overall, this new method provides technical benefits such as improved efficiency, reduced complexity, higher resolution capabilities, and more accurate results compared to existing methods.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance and lifespan of hydroxide detectors made from glass fibers due to factors like high temperatures and pressures during manufacturing processes. Current methods involve adding protectants at different stages beforehand, which makes it difficult to achieve consistently reliable results over time.

Images