Luminescent Photoelastic Coating Strain Measurement System and Method Based on Ratiometric Fluorescence Technology

Abstract

The invention discloses a luminescent photoelastic coating strain measurement system and method based on ratio fluorescence technology, including an excitation light wave generation system, a first dichroic beam splitter, a component to be measured, an analyzer, a second dichroic beam splitter, The first emitted light collection system, the second emitted light collection system, and the data processor; the surface of the member to be measured is provided with a luminescent photoelastic coating, and the luminescent photoelastic coating is provided with two types of light that can be excited by the same wavelength Fluorescent material; the excitation light wave generation system generates excitation light waves directed to the luminescent photoelastic coating, the two fluorescent materials are excited to generate emission light waves, and the emission light waves are separated by a second dichroic beam splitter to form a reflected beam O Ⅰ and the transmitted beam O Ⅱ , the first emitted light collection system and the second emitted light collection system respectively collect the reflected light beam O Ⅰ and the transmitted beam O Ⅱ The parameters are transmitted to the data processor at the same time. Beneficial effects: the present invention can eliminate the influence of external environmental factors on the measurement results and improve the measurement accuracy.

Description

technical field [0001] The invention relates to a coating strain measurement system and method, in particular to a system and method for measuring the full-field strain distribution on the surface of a component by applying ratio fluorescence technology to a luminescent photoelastic coating, and belongs to the technical field of experimental strain analysis. Background technique [0002] The traditional photoelastic coating patch method is to first paste a layer of strain-sensitive transparent sheet made of epoxy resin on the surface of the component to be tested, and then observe and measure the contour line (indicating the principal strain difference) and the contour line through the photoelastic instrument. Inclination line (representing the principal strain direction), an experimental strain analysis method to obtain the full-field strain distribution on the surface of the component. Because it not only has the characteristics of intuition, image, real-time, full field, ...

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Problems solved by technology

The light intensity polarization coefficient of the coating is an experimental parameter related to many factors such as the reflection of the substrate surface, the intensity of the excitation light wave, the angle of incidence, the measuring instrument, and the environment. The experimental measurement results are directly affected by the temporal instability of the excitation light intensity. , spatial inhomogeneity, and lead to a reduction in the accuracy of the strain analysis results

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