Method for quickly detecting water content of bamboo on basis of X-ray CT (computed tomography) technology
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A technology of tomography and detection method, which is applied in the direction of using radiation for material analysis, etc., to achieve the effect of saving production costs, improving detection accuracy, saving detection and manpower
Inactive Publication Date: 2016-03-16
INT CENT FOR BAMBOO & RATTAN
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[0003] At present, the commonly used method to measure the moisture content of bamboo is the weighing method. The measurement result is more accurate and has fewer restrictions. It is suitable for any bamboo in any moisture state, but it is time-consuming. The operation is cumbersome, the detection cost is high, and it is easy to cause damage to the inspected object, which affects the speed of industrial production
In addition, there are resistance method and electromagnetic method to measure the moisture content of bamboo. Both of them can only measure the moisture content within a certain range below the fiber saturation point. The accuracy of the measurement results is poor, and there are many restrictions. The inspected object causes damage and affects the speed of industrial production
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Embodiment 1
[0056] (3) Using General Electric (GE) BrightSpeedExcel 4-slice helical CT, considering the impact of scanning time on CT measurement values (moisture content change), and referring to previous research results, the scanning parameters of this test are set to 120kV, 160mAs , slice thickness 0.625mm, slice distance 1.25mm, FOV 9.6 and reconstruction algorithm "std", scan 5 CT images for each specimen, laboratory room temperature 20±2°C.
[0057] Carry out CT scanning along the axial direction of moso bamboo for the specimens under the above-mentioned different moisture content states, select appropriate scanning parameters according to different bamboo species, determine the number of scanning fault layers according to the scanning layer thickness and layer spacing, and obtain the The average CT value of the picture is calculated as the overall average CT value of the specimen (bamboo has typical gradient material characteristics, and the moisture content measured by this meth...
Embodiment 2
[0066] (3) Using General Electric (GE) BrightSpeedExcel 4-slice spiral CT, scanning parameters were set to 120kV, 160mAs, slice thickness 0.625mm, slice spacing 1.25mm, FOV9.6 and reconstruction algorithm "std", along the axial direction of Moso bamboo Direction Scan 5 CT images for each specimen, and the room temperature in the laboratory is 20±2°C.
[0067] (4) Calculate the overall average CT value of the specimen according to formula ①:
[0068] CT ①
[0069] CT: mean CT value; CT 1 , CT 2 ...CT n : CT value of different slices; n: number of scan slices;
[0070] Calculate the relative moisture content of the specimen according to the formula ②:
[0071] Mc=0.001H+0.2345②
[0072] Mc: relative water content; H: CT value.
[0073] (5) Figure 6 It is the fitting curve between the CT value of moso bamboo and the actual measured relative moisture content under different moisture content states, and the correlation coefficient R2=0.9206, indicating that the CT value ...
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Abstract
The invention belongs to a method for quickly detecting the water content of bamboo on the basis of an X-ray CT (computed tomography) technology. The method comprises steps as follows: standard specimens for detecting the water content of to-be-detected bamboo are selected as required; the manufactured specimens are put into dryers containing different saturated salt solutions, the mass of the specimens in different water content gradient states and the mass of the totally dry specimens are weighed according to Testing Methods for Physical and Mechanical Properties of Bamboos GB / T 15780-1995 when the water content of the specimens is stable and does not change, the specimens in different water content states are subjected to CT scanning in the axial direction of moso bamboo by means of the X-ray CT technology, appropriate scanning parameters are selected according to different bamboo species, the number of scanned layers is determined according to the thickness of the scanned layer and the interval between the adjacent layers, a fitting equation is established according to a fitting curve, and the water content of the to-be-detected sample is calculated. The method is environment-friendly and efficient, can be used for detecting the water content of the bamboo conveniently, quickly and intactly and has the advantages of accuracy, environment-friendliness, low cost and simplicity and convenience in operation.
Description
technical field ： [0001] The invention belongs to a method for quickly detecting the moisture content of bamboo based on X-ray computerized tomography technology, and mainly relates to a method for detecting the moisture content of moso bamboo by X-ray computerized tomography technology. Background technique ： [0002] Bamboo is a kind of hygroscopic material. Its moisture content is closely related to its density. Changes in moisture content directly affect the strength, rigidity, hardness, decay resistance, machining performance, combustion value, thermal conductivity, and electrical conductivity of bamboo, thus affecting the bamboo. Processing technology and utilization. Therefore, before the processing technology and utilization of the bamboo materials in this area or this batch, it is necessary to test the moisture content of the bamboo materials, and use the test results as a basis to determine the processing technology and utilization areas of this area or this ...
Claims
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