X-ray nondestructive testing method for circuit board

Abstract

The invention discloses a method for X-ray nondestructive detection of a circuit board, and particularly relates to the technical field of circuit board detection, and the method comprises the following steps: step 1, preparing equipment, ensuring that X-ray nondestructive detection equipment is in a good working state, and checking whether each part of the equipment is intact and whether the function is normal; the circuit board is thoroughly cleaned, dirt, grease and other impurities on the surface of the circuit board are removed, scattering of X-rays is reduced, the image definition is improved, and therefore the detection precision is improved, meanwhile, the filter is selected to enhance the X-rays with the specific wavelength, background noise is reduced, the image definition is improved, and the detection precision is improved. And then enhancement processing including contrast stretching, sharpening and denoising is performed on the acquired image by using advanced image processing software, and the detail expressive force and readability of the image are improved, so that the detection precision is relatively high, the influence of external factors is avoided, the deviation of a detection result is avoided, and the detection accuracy is improved. And the practical application effect of the method is relatively good.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board detection. More specifically, the present invention relates to a method for non-destructive X-ray detection of circuit boards. Background Art

[0002] The non-destructive X-ray detection technology realizes the visual analysis of the internal structure by penetrating the circuit board with high-energy rays and recording the attenuation difference for imaging. Its core principle is based on the difference in the absorption rate of X-rays by different materials. The rays penetrating through are captured by a detector to form a grayscale image, thereby revealing hidden defects.

[0003] The existing methods for non-destructive X-ray detection of circuit boards have insufficient accuracy and are affected by various external factors during the detection process, resulting in deviations in the detection results, making the actual application effect of the existing methods for non-destructive X-ray detection of circuit boards not good enough. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a method for non-destructive X-ray detection of circuit boards. The present invention thoroughly cleans the circuit board, removes dirt, grease and other impurities on the surface, reduces the scattering of X-rays, improves the clarity of the image, thereby improving the detection accuracy. At the same time, a filter is selected to enhance X-rays of a specific wavelength, reduce background noise, and improve the clarity of the image. Then, advanced image processing software is also used to enhance the collected image, including contrast stretching, sharpening and denoising, to improve the detail expressiveness and readability of the image, so that the detection accuracy of the present invention is relatively high, avoiding the influence of external factors, thus avoiding deviations in the detection results, and making the actual application effect of the present invention better, so as to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A method for non-destructive X-ray detection of circuit boards, comprising the following steps: Step 1: Prepare the equipment to ensure that the non-destructive X-ray detection equipment is in good working condition, check whether all components of the equipment are intact and whether their functions are normal; Step 2: According to the size and shape of the circuit board to be detected, select a suitable sample tray and fixture. Then, before detection, thoroughly clean the circuit board to remove dirt, grease and other impurities on the surface, reduce the scattering of X-rays, and improve the clarity of the image; Step 3: According to the material, thickness and detection requirements of the circuit board, set the X-ray detection parameters, including the intensity of X-rays, exposure time, detector sensitivity, detection distance and detection time. Then, use a standard sample for calibration to ensure that the parameter settings of the detection equipment are accurate. Select a filter as needed to enhance X-rays of a specific wavelength, reduce background noise, and improve the clarity of the image; Step 4: Select "Load Sample" on the device control panel, start the X-ray generator, adjust the intensity and exposure time of the X-ray, capture the image formed after the X-ray penetrates the circuit board through the detector, and use advanced image processing software to enhance the collected image, including contrast stretching, sharpening, and denoising, to improve the detail expressiveness and readability of the image; Step 5: Perform three detections on the same circuit board, compare the results of different detections, reduce accidental errors, and improve the reliability of the detection results. On the basis of automatic detection, add a manual review step, and have experienced inspectors carefully check the detection results to ensure that there are no omissions or misjudgments; Step 6: Carefully observe the structure and details of the circuit board in the image, look for possible defects, including cracks, voids, and bubbles, and cooperate with visualization software to perform semi-automatic detection of suspected defects to improve the detection efficiency and accuracy; Step 7: Evaluate the quality of the circuit board based on the detection results, and determine whether there are defects and the severity of the defects.

[0006] In a preferred embodiment, the advanced image processing software in Step 4 is set to VCxrayx.OS software.

[0007] Technical effects and advantages of the present invention: The present invention thoroughly cleans the circuit board, removes dirt, grease, and other impurities on the surface, reduces the scattering of X-rays, improves the clarity of the image, thereby improving the detection accuracy. At the same time, a filter is selected to enhance X-rays of specific wavelengths, reduce background noise, and improve the clarity of the image. Then, advanced image processing software is also used to enhance the collected image, including contrast stretching, sharpening, and denoising, to improve the detail expressiveness and readability of the image, making the detection accuracy of the present invention relatively high, avoiding the influence of external factors, thus avoiding deviations in the detection results, and making the actual application effect of the present invention relatively good. Specific embodiments

[0008] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0009] Embodiment The present invention provides a method for non-destructive X-ray detection of circuit boards, including the following steps: Step 1: Prepare the equipment to ensure that the X-ray non-destructive detection equipment is in good working condition, check whether all components of the equipment are intact and whether the functions are normal; Step 2: Select a suitable sample tray and fixture according to the size and shape of the circuit board to be detected. Then, before detection, thoroughly clean the circuit board to remove surface dirt, grease, and other impurities, reduce X-ray scattering, and improve image clarity; Step 3: Set X-ray detection parameters according to the material, thickness, and detection requirements of the circuit board, including X-ray intensity, exposure time, detector sensitivity, detection distance, and detection time. Then, calibrate using a standard sample to ensure accurate parameter settings of the detection equipment. Select a filter as needed to enhance X-rays of specific wavelengths, reduce background noise, and improve image clarity; Step 4: Select to load the sample on the equipment control panel and start the X-ray generator. Adjust the X-ray intensity and exposure time, capture the image formed after the X-rays penetrate the circuit board through the detector, and use advanced image processing software to enhance the collected image, including contrast stretching, sharpening, and denoising, to improve the detail expressiveness and readability of the image; Step 5: Detect the same circuit board three times and compare the results of different detections to reduce accidental errors and improve the reliability of the detection results. On the basis of automatic detection, add a manual review step, and have experienced inspectors carefully check the detection results to ensure that there are no omissions or misjudgments; Step 6: Carefully observe the structure and details of the circuit board in the image to find possible defects, including cracks, voids, and bubbles, and cooperate with visualization software to perform semi-automatic detection of suspected defects to improve detection efficiency and accuracy; Step 7: Evaluate the quality of the circuit board according to the detection results, and judge whether there are defects and the severity of the defects.

[0010] The advanced image processing software in Step 4 is set to VCxray x.OS software.

[0011] The present invention first prepares the equipment to ensure that the X-ray non-destructive testing equipment is in good working condition, checks whether all components of the equipment are intact and whether the functions are normal, selects a suitable sample tray and fixture according to the size and shape of the circuit board to be detected. Then, before detection, the circuit board is thoroughly cleaned to remove dirt, grease and other impurities on the surface, reduce the scattering of X-rays and improve the clarity of the image. According to the material, thickness and detection requirements of the circuit board, set the X-ray detection parameters, including the intensity of X-rays, exposure time, detector sensitivity, detection distance and detection time. Then use a standard sample for calibration to ensure that the parameter settings of the detection equipment are accurate. Select a filter as needed to enhance X-rays of a specific wavelength, reduce background noise and improve the clarity of the image. Select to load the sample on the equipment control panel and start the X-ray generator, adjust the intensity and exposure time of the X-rays, and capture the image formed after the X-rays penetrate the circuit board through the detector. Use advanced image processing software to enhance the collected image, including contrast stretching, sharpening and denoising, to improve the detail expressiveness and readability of the image. Detect the same circuit board three times and compare the results of different detections to reduce accidental errors and improve the reliability of the detection results. On the basis of automatic detection, add a manual review step. Experienced inspectors carefully check the detection results to ensure that there are no omissions or misjudgments. Carefully observe the structure and details of the circuit board in the image to find possible defects, including cracks, voids and bubbles, and cooperate with visualization software to perform semi-automatic detection of suspected defects to improve the detection efficiency and accuracy. Evaluate the quality of the circuit board according to the detection results, judge whether there are defects and the severity of the defects. The present invention thoroughly cleans the circuit board, removes dirt, grease and other impurities on the surface, reduces the scattering of X-rays and improves the clarity of the image, thereby improving the detection accuracy. At the same time, a filter is selected to enhance X-rays of a specific wavelength, reduce background noise and improve the clarity of the image. Then advanced image processing software is also used to enhance the collected image, including contrast stretching, sharpening and denoising, to improve the detail expressiveness and readability of the image, making the detection accuracy of the present invention relatively high, avoiding the influence of external factors, thus avoiding deviation of the detection results, and making the actual application effect of the present invention relatively good.

[0012] Finally: The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for non-destructive X-ray inspection of circuit boards, characterized in that, It includes the following steps: Step 1: Prepare the equipment, ensure that the X-ray non-destructive testing equipment is in good working condition, check whether all components of the equipment are intact and whether the functions are normal; Step 2: According to the size and shape of the circuit board to be detected, select a suitable sample tray and fixture. Then, before detection, thoroughly clean the circuit board to remove surface dirt, grease and other impurities, reduce X-ray scattering and improve the clarity of the image; Step 3: According to the material, thickness and detection requirements of the circuit board, set the X-ray detection parameters, including the intensity of X-ray, exposure time, detector sensitivity, detection distance and detection time. Then use a standard sample for calibration to ensure that the parameter settings of the detection equipment are accurate. Select a filter as needed to enhance X-rays of specific wavelengths, reduce background noise and improve the clarity of the image; Step 4: Select to load the sample on the equipment control panel and start the X-ray generator. Adjust the intensity and exposure time of the X-ray, capture the image formed after the X-ray penetrates the circuit board through the detector, and use advanced image processing software to enhance the collected image, including contrast stretching, sharpening and denoising, to improve the detail performance and readability of the image; Step 5: Conduct three detections on the same circuit board and compare the results of different detections to reduce accidental errors and improve the reliability of the detection results. On the basis of automatic detection, add a manual review step. Have experienced inspectors carefully check the detection results to ensure that there are no omissions or misjudgments; Step 6: Carefully observe the structure and details of the circuit board in the image to find possible defects, including cracks, voids and bubbles, and cooperate with visualization software to conduct semi-automatic detection of suspected defects to improve the detection efficiency and accuracy; Step 7: Evaluate the quality of the circuit board according to the detection results and judge whether there are defects and the severity of the defects.

2. The method for X-ray nondestructive testing of a circuit board according to claim 1, characterized in that: The advanced image processing software in Step 4 is set as VCxray x.OS software.