Is there an acid solution test report on the gauze

Introduction

Spectral reflectance is an index of the wavelength distribution of the reflected sunlight of an object, which is affected by the spectral absorption characteristics of the object itself, the surface structure, the degree of smoothness and the ambient light conditions. Hyperspectral imaging technology, as an advanced detection method, uses dispersive elements (such as grating or prism) to divide the incident light, and imagines the object on the detector through the imaging system, so as to realize the high-precision analysis of the object.

In this report, we will introduce the principle of hyperspectral imaging technology in detail, and verify the application effect of this technology in detecting the presence of acid solution on gauze through experimental tests. During the experiment, we will use the hyperspectral camera to detect the spectral reflectance of the gauze coated with acid solution and the blank control gauze, and analyze the experimental results. It is hoped that this report can provide useful reference for the research and application in related fields.

1. Spectral reflectance

Spectral reflectance refers to the wavelength distribution of sunlight reflected by an object, which is related to the spectral absorption characteristics of the object, the surface structure of the object, the smoothness of the object and the environmental lighting conditions.

2. Hyperspectral imaging principle

Dispersive hyperspectral camera - Grating Dispersive type: The use of dispersive elements (grating or prism) to light, and then through the imaging system image on the detector. The above picture shows the specific principle of a raster dispersive hyperspectral camera.

If we want to measure the hyperspectral data of each point of the leaf in the figure, the incident light is reflected on the grating plane, the incident light of this point is decomposed into the energy distribution at different wavelengths, and then the energy at different wavelengths is measured by multiple sensor pixels. What this picture shows is that you need a reflection grating or a transmission grating to split the light.

The advantage of this approach is that you can deal with all the points on a line at once. The energy at each point at a different wavelength can then be measured once. Therefore, most raster type hyperspectral cameras are designed as line scanning cameras. Get spectral data for all wavelengths at each point on a line at a time. Since the spectral data at different wavelengths of each point are obtained at the same time, the spectral data at different wavelengths of this point can be calculated simultaneously. This is a very important feature of the raster type. Raster hyperspectral cameras are particularly suitable for color measurement, fruit classification and quality, sugar content detection, and plastic classification in plastic waste recycling, because these applications require simultaneous computation of different wavelength data at each point in order to calculate the results we want.

3. Experimental testing

3.1 Experimental purpose

Test the fabric for acid solution.

3.2 List of experimental test instruments

Material reagent: hypochlorous acid solution, gauze

3.3 Experimental content

Hypochlorous acid was applied to one of the two pieces of gauze and marked, and the other was used as a blank control. The spectral reflectance of acid-free and acid-free regions on the gauze was measured.

The experimental measurement process of whether the gauze contains acid is shown in the figure below：

3.4 Experimental Results

Through 900-1700nm near-infrared spectral image can be directly observed whether there is an acid solution on the surface of the object

4. Conclusion

Through the above two sets of sampling test results, 900-1700nm can feedback whether there is an acid solution, and can detect whether there is an acid solution on the cloth through near-infrared spectroscopy.