A V-shaped special optical fiber micro liquid refractive index measuring device and preparation method
A special optical fiber and measuring device technology, applied in measuring device, phase influence characteristic measurement, material analysis by optical means, etc., can solve the problems of complex process and poor repeatability, and achieve the effect of reducing process steps and improving reliability.
Active Publication Date: 2021-11-23
HARBIN ENG UNIV
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Problems solved by technology
These processes are complex and have poor repeatability, and usually only detect substances with a refractive index smaller than that of the optical fiber
Method used
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[0029] The present invention will be further described below in conjunction with accompanying drawing:
[0030] The purpose of the present invention is to provide a V-type special optical fiber trace liquid refractive index measuring device and preparation method, which can detect the refractive index of the substance to be measured with a very small amount of substance to be measured.
[0031] There are multiple modes in the V-shaped special fiber. The wide-spectrum light source is injected into the V-shaped special fiber from the single-mode fiber to excite multiple modes of the V-shaped special fiber to form multi-mode interference fringes. The output spectrum S(λ) is:
[0032]
[0033] Where N is the number of excited modes in the V-type special fiber, S 0 (λ) is the incident spectrum, η i Indicates the coupling coefficient between the LP01 mode input by the single-mode fiber and the i-th mode in the V-shaped special fiber, that is
[0034]
[0035] where E 0 (r) ...
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Abstract
The invention provides a trace liquid refractive index measuring device and preparation method of a V-shaped special optical fiber. One end of the V-shaped groove optical fiber is connected to an optical fiber and a wide-spectrum light source in sequence, and the other end of the V-shaped groove is connected to an optical fiber and a spectrum analyzer in sequence. The grooved optical fiber is a special optical fiber with an axial opening of α, and a rectangular groove is opened in the axial direction of the optical fiber preform; the optical fiber preform after slotting is placed in a fiber drawing tower, and a V-shaped grooved optical fiber with an opening angle α is drawn; Connect the instrument, inject the liquid to be tested into the V-shaped groove by using a micro-injection distributor with a tapered etched capillary tube at the lower end; analyze the spectral changes in the spectrometer to obtain the refractive index of the liquid to be tested. The invention reduces the process steps of the special optical fiber and improves the reliability of the manufacturing process. As a new type of refractive index sensor, the test can be completed with a very small amount of the substance to be tested, and can be used to measure the refractive index of the matching liquid, and can also be used for the detection of biological cells. Rapid detection provides effective basic data.
Description
technical field [0001] The invention belongs to the field of optical fiber sensing, and in particular relates to a V-shaped special optical fiber trace liquid refractive index measuring device and a preparation method. Background technique [0002] Optical fiber sensing technology is a new sensing technology developed along with optical fiber technology and optical communication technology, and has been widely used in various industries. Compared with traditional biosensors, optical fiber biosensors have unique advantages such as small size, simple structure, anti-electromagnetic interference, high sensitivity, and low cost, and have become one of the research hotspots in the field of biosensing. The research and development of optical fiber biosensors has become a new hotspot in the development of international science and technology, an important part of the high-tech industry, and has important strategic significance. [0003] At present, the common optical fiber biosens...
Claims
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IPC IPC(8): G01N21/45
CPCG01N21/455G01N2021/458
Inventor 柴全张斌田野任晶刘艳磊张建中
Owner HARBIN ENG UNIV