Rapid nondestructive testing method for black spots in hickory nuts
A non-destructive testing, pecan technology, applied in measurement devices, color/spectral property measurement, material analysis by optical means, etc., can solve problems such as difficulty
Pending Publication Date: 2021-01-08
ZHEJIANG FORESTRY UNIVERSITY
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AI Technical Summary
Problems solved by technology
[0004] Based on the requirement of hickory quality detection, the present invention aims at the difficult problem of non-destructive detection of hickory internal nuts through the hickory shell, and provides a fast non-destructive detection method for hickory internal black spots, which is screened according to spectral information For the applicable characteristic wavelength, select the wavelength with good penetration to the shell and the large difference in the characteristics of the nut, and calibrate the power of the near-infrared light source, and then use the near-infrared diffuse reflectance spectroscopy to detect the black spots inside the hickory nut, and use near-infrared light sources with different powers Infrared light source irradiates hickory nuts to eliminate the noise of the shell, so as to effectively obtain the spectral information of the nuts and improve the accuracy of the detection of black spots inside the hickory nuts; and through multi-point detection, the severity and location of the hickory black spots distinguish
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0045] Embodiment: a kind of rapid non-destructive detection method of hickory internal black spot, the steps of this method are as follows:
[0046] Step 1: Determine the main characteristic wavelengths of the hickory black spot;
[0047] Step 1.1, obtain some hickory nut samples, after shelling, classify the kernels according to the black spots and normal, and put the shells together;
[0048] Step 1.2, for the hickory nuts with black spots, crush the black spot part of the nuts, pass through a 60-mesh sieve, take the sieved nuts and press them into blocks, which are recorded as sample A 1 ; Continue to obtain k-1 black-spotted pecan block samples in the same way, denoted as A 2 ,A 3 ,A 4 ,...,A k , thickness and sample A 1 same;
[0049] Step 1.3, randomly select k samples of semicircular fruit shells with complete appearance from the gathered fruit shells, denoted as B 1 ,B 2 ,B 3 ,...,B k ;
[0050] Step 1.4, for the normal hickory nuts, crush and pass through ...
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Abstract
The invention discloses a rapid nondestructive detection method for black spots in hickory nuts, and solves the problem of high difficulty in nondestructive detection of kernels in the hickory nuts through hickory nut shells based on the requirements of hickory nut quality detection. According to the detection method, spectral wavelength screening is carried out according to different characteristics of pecan shells and kernels on near infrared spectra, characteristic wavelength points are reasonably selected, kernel characteristics can be normally reflected through near infrared spectrum detection, a hickory nut sample is irradiated by adopting near infrared light sources with two powers, and first and second diffuse reflection spectra of the hickory nut sample are obtained; the second diffuse reflection spectrum and the first diffuse reflection spectrum of the hickory nut sample are deducted according to a certain mode so as to reduce the influence of hickory nut shell spectrum information, highlight the spectrum information of hickory nut black spots and improve the detection accuracy of hickory nut black spots. According to the method, the rapid nondestructive detection of theinternal black spots of the hickory nuts by the near infrared spectrum is realized, the hickory nuts with the internal black spots can be effectively screened, and the product quality is improved.
Description
technical field [0001] The invention belongs to the field of agricultural product quality detection, and relates to a rapid non-destructive detection method for black spots inside hickory nuts. Background technique [0002] Pecan, also known as walnut, is a high-grade nut loved by people because of its high nutritional value and unique taste. Pecan black spot is caused by a fungal infection that can cause the pecan kernels to taste bitter and greatly reduce the quality of the pecans. For processed whole pecans, the internal dark spots (kernel black spots) are not visible to the naked eye and need to be shelled to find them. Shelling is a destructive method, which is not suitable for the detection of all hickory nuts, and is only suitable for individual sampling; but because black-spotted hickory only accounts for a small part of normal hickory, individual sampling is very important for the detection of black spots inside hickory. The representativeness of the rate is poor,...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G01N21/25
CPCG01N21/25G01N21/274
Inventor 孙通胡栋杨自栋宋丽丽喻卫武
Owner ZHEJIANG FORESTRY UNIVERSITY