Luminescent photoelastic coating strain measurement system and method based on ratio fluorescence technology

Abstract

The invention discloses a luminescent photoelastic coating strain measurement system and method based on a ratio fluorescence technology. The system comprises an excitation light wave generation system, a first dichroic spectroscope, a to-be-measured component, an analyzer, a second dichroic spectroscope, a first emitted light acquisition system, a second emitted light acquisition system and a data processor. A luminous photoelastic coating is arranged on the surface of the to-be-measured component, and two fluorescent materials capable of being excited by the same wavelength are arranged in the luminous photoelastic coating; and the excitation light wave generation system generates excitation light waves to be emitted to the luminous photoelastic coating, the two fluorescent materials are excited to generate emission light waves, and the emission light waves are separated by the second dichroic spectroscope to form a reflection light beam OI and a transmission light beam OII. The first emitted light acquisition system and the second emitted light acquisition system respectively acquire parameters of the reflected light beam OI and the transmitted light beam OII and transmit the parameters to the data processor. The system has the beneficial effects that the influence of external environmental factors on the measurement result can be eliminated, and the measurement precision is improved.

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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