Mural soluble salt content detection method based on reflection spectrum

Abstract

The invention discloses a method for detecting the content of soluble salts in a mural based on a reflection spectrum. The method comprises the following steps: preparing a plurality of standard mural sample blocks containing soluble salts with different mass concentrations; sampling each standard mural sample block for at least one time by utilizing a spectroradiometer at a preset time interval to obtain an original reflection spectrum of the standard mural sample block; carrying out reciprocal logarithmic transformation on the original reflection spectrum to obtain a reciprocal logarithmic spectrum; extracting a characteristic wave band; by taking the mass concentration of the soluble salt of the standard mural sample block as a dependent variable and the parameter value of the reciprocal logarithmic spectrum at the characteristic wave band as an independent variable, establishing a mural sample soluble salt content prediction model; acquiring a point-like spectrum curve of a specified position of the mural to be detected by using the spectroradiometer, and predicting the mass concentration of the soluble salt by using the soluble salt content prediction model. The method has the beneficial effects that the content of soluble salt in any area in the mural can be detected in a lossless, efficient and real-time manner.

Description

technical field [0001] The invention relates to the technical field of mural detection. More specifically, the present invention relates to a method for detecting the soluble salt content of murals based on reflection spectrum. Background technique [0002] Murals are colorful paintings attached to ancient buildings, and they are also carriers that reflect human social life, religious beliefs, and historical culture. However, due to natural erosion and degradation and improper human intervention, the preservation status of the murals has been worrying. The murals interact significantly with the soluble salts in the environment, and the salt will continue to dissolve, crystallize, and expand with temperature. Once the content accumulates to a certain concentration, it will move to the surface of the murals through capillary water movement to enrich and crystallize, thereby inducing the murals to brittle. A variety of irreversible mural diseases such as alkali herpes. Once ...

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Problems solved by technology

[0003] At present, there are mainly two methods for the detection of soluble salts in murals. The first is to use ion chromatography to analyze the type and content of salt in murals; the second is to use capillary electrophoresis to quickly detect and analyze salt damage in murals; Both of the above two methods require on-the-spot sampling of the location to be detected in the full-frame mural (the diseased part of the ground layer), which is not only difficult to detect the salt content in any designated area of ​​the full-frame mural, but also destroys the integrity of the mural. The detection range of salt ion concentration has a peak limit, and the precision and accuracy will decrease with the sampling quality, so it is impossible to dynamically monitor the salt content

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