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Broadband fluorescence spectrum strain sensing method

A fluorescence spectrum and sensing technology, which is applied in the field of broadband fluorescence spectrum sensing and sensing, can solve problems such as difficult measurement of stress and strain, achieve the effect of reducing the lower limit of measurement and improving measurement accuracy

Inactive Publication Date: 2015-12-23
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

In other words, it is difficult for traditional pressure-sensitive fluorescence spectroscopy to measure small stress-strain

Method used

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  • Broadband fluorescence spectrum strain sensing method
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Embodiment Construction

[0020] The technical content part of the present invention describes a method for measuring strain by using the center of gravity wavenumber position of the band of fluorescence spectrum. The test system used in this method can be realized based on a common grating spectrometer. with a Eu 2+ Taking the temperature characteristics of doped inorganic oxide materials as an example, the specific description is as follows:

[0021] Use a spectrometer working in the visible light band with a resolution of 0.5nm to measure Eu 2+ In the emission spectrum of the phosphor-doped composite material, the blue-violet light band can excite red fluorescence emission, and 405nm is arbitrarily selected as the excitation light wavelength in the excitation light band.

[0022] Coating the precursor of the fluorescent composite material on a standard sample, for example, forming a thin coating on a regular metal plate; or making the fluorescent composite material into a standard sample with regu...

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Abstract

The invention relates to a broadband fluorescence spectrum strain sensing method. The method comprises steps that, a broadband spectrum of a fluorescent material is utilized to carry out for strain measurement, intensity integration and spectrum band medium division processing on fluorescence spectrum band data in wave number distribution are sequentially carried out to acquire a gravity center wave number value of the fluorescence spectrum band, the gravity center wave number value is taken as the position of the spectrum band, and thereby a sensing function relation between the spectrum band gravity center and strain is acquired. Through the method, physical meaning of the spectrum band gravity center is explained, strain measurement feasibility through the spectrum band gravity center method is approved through examples, and stress magnitude can be reckoned according to a strain value and a material mechanical strength value.

Description

technical field [0001] The invention relates to an optical measurement method of stress and strain, in particular to a method for sensing strain with broadband fluorescence spectrum. Background technique [0002] The technique of sensing stress strain with fluorescent features of sensitive materials has the typical advantages of photometry technology, including immunity to electromagnetic interference, non-contact measurement, etc. In the existing pressure-sensitive fluorescence spectroscopy technology, the physical quantity to be monitored that changes with stress or pressure is the position of the fluorescence peak wavelength (or wave number), which is less sensitive, and the tiny shift of the peak wavelength does not only require ultra-high resolution spectroscopic instruments In order to be observed, the shift of the peak wavelength needs to be large enough. In other words, it is difficult for traditional pressure-sensitive fluorescence spectroscopy to measure tiny stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02G01B11/16G01L1/24
Inventor 张巍巍李朝高益庆何兴道
Owner NANCHANG HANGKONG UNIVERSITY
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