Using a TDI camera in vibration conditions with nonzero viewing angles for surface inspection

Jari Miettinen; Heikki J. Ailisto

doi:10.1117/12.281300

Using a TDI camera in vibration conditions with nonzero viewing angles for surface inspection

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

Abstract

A variety of Time Delay and Integration (TDI) arrays have been developed. The TDI image sensor offers significant improvement in performance over a linear CCD-sensor with respect to sensitivity. This is particularly significant in low light level operation since the effective exposure time is increased by a factor which is equal to the number of the TDI stages in the sensor. Our previous work has indicated that the TDI camera can be used with viewing angles up to 30 degrees from the surface normal. The effects caused by vibration of the viewed surface become critical when using a TDI camera at non-zero viewing angles. For this rfeason, a study was made on the vibration effects. This paper reports this study, concentrating on the relation between the vibration of the inspected surface and the sharpness of the image. The contrast perceived by the TDI camera as a function of the vibration amplitude and frequency is measured. The measurements are performed using a special test pattern in a dynamic situation. The results based on the contrast modulation function (CMF) in the vertical and horizontal directions are reported. A hypothesis of the effect of vibration on the CMF was formulated as a rule, which was then tested with measured data. Tentative result support the hypothesis.

Original language	English
Title of host publication	New Image Processing Techniques and Applications: Algorithms, Methods, and Components II
Editors	Philippe Refregier, Rolf-Juergen Ahlers
Pages	111-118
Number of pages	8
DOIs	https://doi.org/10.1117/12.281300
Publication status	Published - 1 Dec 1997
MoE publication type	A4 Article in a conference publication
Event	New Image Processing Techniques and Applications: Algorithms, Methods, and Components II - Munich, Ger Duration: 18 Jun 1997 → 19 Jun 1997

Publication series

Series	Proceedings of SPIE
Volume	3101

Conference

Conference	New Image Processing Techniques and Applications: Algorithms, Methods, and Components II
City	Munich, Ger
Period	18/06/97 → 19/06/97

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10.1117/12.281300

Cite this

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title = "Using a TDI camera in vibration conditions with nonzero viewing angles for surface inspection",

abstract = "A variety of Time Delay and Integration (TDI) arrays have been developed. The TDI image sensor offers significant improvement in performance over a linear CCD-sensor with respect to sensitivity. This is particularly significant in low light level operation since the effective exposure time is increased by a factor which is equal to the number of the TDI stages in the sensor. Our previous work has indicated that the TDI camera can be used with viewing angles up to 30 degrees from the surface normal. The effects caused by vibration of the viewed surface become critical when using a TDI camera at non-zero viewing angles. For this rfeason, a study was made on the vibration effects. This paper reports this study, concentrating on the relation between the vibration of the inspected surface and the sharpness of the image. The contrast perceived by the TDI camera as a function of the vibration amplitude and frequency is measured. The measurements are performed using a special test pattern in a dynamic situation. The results based on the contrast modulation function (CMF) in the vertical and horizontal directions are reported. A hypothesis of the effect of vibration on the CMF was formulated as a rule, which was then tested with measured data. Tentative result support the hypothesis.",

author = "Jari Miettinen and Ailisto, {Heikki J.}",

year = "1997",

month = dec,

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doi = "10.1117/12.281300",

language = "English",

isbn = "0819425214",

series = "Proceedings of SPIE",

publisher = "International Society for Optics and Photonics SPIE",

pages = "111--118",

editor = "Philippe Refregier and Rolf-Juergen Ahlers",

booktitle = "New Image Processing Techniques and Applications: Algorithms, Methods, and Components II",

note = "New Image Processing Techniques and Applications: Algorithms, Methods, and Components II ; Conference date: 18-06-1997 Through 19-06-1997",

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Miettinen, J & Ailisto, HJ 1997, Using a TDI camera in vibration conditions with nonzero viewing angles for surface inspection. in P Refregier & R-J Ahlers (eds), New Image Processing Techniques and Applications: Algorithms, Methods, and Components II. Proceedings of SPIE, vol. 3101, pp. 111-118, New Image Processing Techniques and Applications: Algorithms, Methods, and Components II, Munich, Ger, 18/06/97. https://doi.org/10.1117/12.281300

Using a TDI camera in vibration conditions with nonzero viewing angles for surface inspection. / Miettinen, Jari; Ailisto, Heikki J.
New Image Processing Techniques and Applications: Algorithms, Methods, and Components II. ed. / Philippe Refregier; Rolf-Juergen Ahlers. 1997. p. 111-118 (Proceedings of SPIE, Vol. 3101).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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N2 - A variety of Time Delay and Integration (TDI) arrays have been developed. The TDI image sensor offers significant improvement in performance over a linear CCD-sensor with respect to sensitivity. This is particularly significant in low light level operation since the effective exposure time is increased by a factor which is equal to the number of the TDI stages in the sensor. Our previous work has indicated that the TDI camera can be used with viewing angles up to 30 degrees from the surface normal. The effects caused by vibration of the viewed surface become critical when using a TDI camera at non-zero viewing angles. For this rfeason, a study was made on the vibration effects. This paper reports this study, concentrating on the relation between the vibration of the inspected surface and the sharpness of the image. The contrast perceived by the TDI camera as a function of the vibration amplitude and frequency is measured. The measurements are performed using a special test pattern in a dynamic situation. The results based on the contrast modulation function (CMF) in the vertical and horizontal directions are reported. A hypothesis of the effect of vibration on the CMF was formulated as a rule, which was then tested with measured data. Tentative result support the hypothesis.

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ER -

Using a TDI camera in vibration conditions with nonzero viewing angles for surface inspection

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