Thermal Image Refinement Approach for Scratches on a Magnetic Disk Evaluated at Various Angles

Todtong, Y.; Kaewrawang, Arkom; Sivaratana, R.; Kruesubthaworn, Anan; Thompson, Sarah

doi:10.1080/10739149.2013.769176

Cited by 2 publications

(3 citation statements)

References 18 publications

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“…In addition, for further enhancement of signal amplitude, the RF amplifier circuit is extended to transform a light signal from four photodiode detectors to four current signals. The technique is then developed to integrate the signals by using the RF summing amplifier circuit, as shown in Figure 3 and Equations (4) and (5) for the CD/DVD set, respectively.…”

Section: Rf Amplifier Of Signalsmentioning

confidence: 99%

“…Although these three methods are surface free-contact techniques, they are expensive, destructive, and time-consuming. In order to cover up these disadvantages, the scratch inspection with a satisfied resolution in a quick process was developed using a thermal infrared camera to detect the surface heat and it was found that heat appears only on the surface, not scratch [5]. A magnetic disk, in the real process, rotates at a certain velocity and researchers have proposed various possibilities to detect a scratch dynamically.…”

Section: Introductionmentioning

confidence: 99%

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Utilization of CD and DVD Pick-Up Heads for Scratch Inspection of Magnetic Disk in Dynamic State Using Microcontroller

Polsawat

Tipcharoen²,

Siritaratiwat

2020

Applied Sciences

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A non-destructive technique to inspect a scratch on all magnetic disks in the beginning process of hard disk drive (HDD) manufacturing by using CD and DVD pick-up heads as the detector is proposed. It requires a 100% disk inspection of micrometer-sized scratches in a quick measurement with low cost inventing. Most of the previous studies were in static state but this is the first time to be done in dynamic study using the microcontroller in order to promptly serve for industrial utilization. The size, position, and shape characteristic of scratches are examined using light reflection technique. The results show that, when the laser beam is targeted on a magnetic disk in a position, either scratch or non-scratch, the reflected light intensity differs. The DVD pick-up head can detect the width and the surface characteristic of the scratches, which is similar to the results from scanning electron microscope (SEM) for all scratches sizes less than 100 µm. It is also found that using a DVD pick-up head provides a better resolution of shape characteristic and roughness of scratches surface than a CD pick-up head. Hence, the scratch size of 10s µm scale on the magnetic disk can be accurately characterized by this proposed technique, which can be further utilized for magnetic disk inspection in the hard disk drive manufacturing process.

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Section: Rf Amplifier Of Signalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Utilization of CD and DVD Pick-Up Heads for Scratch Inspection of Magnetic Disk in Dynamic State Using Microcontroller

Polsawat

Tipcharoen²,

Siritaratiwat

2020

Applied Sciences

Self Cite

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“…Hence, by integrating image processing techniques [6][7][8][9][10] and modifying the conventional method, [11,12] this study designs an automatic system for defects of printed art tiles, which is suitable for in-line inspection of printed tile defects. After analyzing the art tile texture features through gray level co-occurrence matrix, the analysis results were input into the backward propagation neural network in order to train the defect classifier.…”

Section: Introductionmentioning

confidence: 99%

Automatic Inspection System for Defects of Printed Art Tile Based on Texture Feature Analysis

Yang

Lin

et al. 2013

Instrumentation Science & Technology

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& An automatic inspection system of printed art tile defects is reported in this artucke. After calculating eight defect features of art tile using the gray level co-occurrence matrix and the average R, G, B values of a defective area, the results were input into a backward propagation neural network for training the defect classifier. During inspection, the proposed system compared the inspected image with a standard image and removed noise by an erosion operation in order to preliminarily determine whether the art tile had defects. For the defective art tile images, the proposed classifier successfully identified four types of common printing defects. The proposed algorithm had an average recognition rate of 90%, suggesting that the recognition accuracy is good, and only requires 1-2 s to inspect an art tile with the size of 15 Â 15 cm 2 . The inspection speed is faster than the conventional manual inspection, and recognition results are more stable. The proposed system can reduce the risk of error caused by the long duration of manual inspection, and thus, can reduce manufacturing costs.

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Thermal Image Refinement Approach for Scratches on a Magnetic Disk Evaluated at Various Angles

Cited by 2 publications

References 18 publications

Utilization of CD and DVD Pick-Up Heads for Scratch Inspection of Magnetic Disk in Dynamic State Using Microcontroller

Utilization of CD and DVD Pick-Up Heads for Scratch Inspection of Magnetic Disk in Dynamic State Using Microcontroller

Automatic Inspection System for Defects of Printed Art Tile Based on Texture Feature Analysis

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