helping you keep an eye on things...
Line scan using a linear CCD array
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Kodak range of linear CCD imagers |
- from http://www.kodak.com/global/en/business/ISS/Products/Linear/index.jhtml?pq-path=12139
- from http://www.kodak.com/global/en/business/ISS/Products/Linear/index.jhtml?pq-path=12139
- from http://www.kodak.com/global/en/business/ISS/Products/Linear/index.jhtml?pq-path=12139
- from http://www.kodak.com/global/en/business/ISS/Products/Linear/index.jhtml?pq-path=12139
- from http://www.kodak.com/global/en/business/ISS/Products/Linear/index.jhtml?pq-path=12139
- from http://www.kodak.com/global/en/business/ISS/Products/Linear/index.jhtml?pq-path=12139
-from http://www.schneideroptics.com/Ecommerce/CatalogSubCategoryDisplay.aspx?CID=1353
The line scan image capture method is useful and efficient for many web and other surface inspection applications. When choosing an appropriate camera, correct lens selection is critical to achieving the desired system performance. The size of the linear array sensor in the camera determines the minimum required image circle of the lens and the size of the sensor's pixels determines a particular optical imaging resolution. The desired object resolution defines the necessary magnification ratio for the optical system. These application specific parameters let you choose the most suitable lens to meet all requirements with respect to image size and quality.
Today's high-performance lenses must follow the technology trend toward smaller pixel sizes and increased sensor resolution. This typically results in larger array sizes and more stringent requirements concerning MTF (Modulation Transfer Function).
Macro-Symmar lenses are designed for industrial machine vision applications and satisfy even the most stringent requirements of 12K line scan applications. These lenses cover a magnification ratio range from 0.33X to 2.0X by using the lens either in standard or retro position. An extension tube together with a special helical mount is used to adjust the focus precisely. Focus as well as iris adjustment are lockable to ensure system stability even in the presence of vibration. A tilt alignment tool can be used to adjust the sensor’s orientation with respect to the optical axis of the lens. The V-mount interface allows alignment of the lens for the best average azimuth position with respect to the linear array.
Lenses for high-resolution line scan:
- Designed for high-resolution 12k line scan applications
- Able to accomodate higher-resolution next generation line scan arrays
- Large image circle up to 90 mm for long linear array sizes
- High optical resolution for small pixel sizes down to 5 µm
- Low distortion for excellent imaging accuracy
- Optimized for magnification ratios from 0.33X to 2.0X
Design example
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Sensor |
Kodak KLI-10203 |
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Pixel Count (along Track) |
10,200 |
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Pixel Size |
PS = 0.007mm sq. |
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Image Side Resolution Limit |
Nyquist = 71.4 Lp/mm |
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Active Sensor Length (along Track) |
2y' = 72.0mm |
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Total Angular FOV (along Track) |
30 deg. |
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Object Distance |
s = infinity for now |
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Temp Range |
10 to 40 deg. C |
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Spectral Band of Imaging |
400 to 700nm Visible |
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f/# |
between 2.8 to 3.5 but can go as low as f/5.6 |
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Iris |
Manual |
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Focus |
To be controlled by a computer - can add a motor & gear |
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For a 30 deg. Total FOV will require a Focal Length = 134.4mm
- We do have a 135mm focal length lens but it will not preform very well at your required resolution and object distance. I would leave this 135mm lens as a possible 2nd choice.
- We have a 120mm (true f' = 124.9mm) focal length at f/5.6 fully opened. This will provide a Total FOV = 32.16 deg.
- We do not manufacture any motorized focus lenses. However, we can place the lens in a helical focus mount which we have had numerous customer add a gear to the outside of the focus mount and drive it. Hopefully this is something you can do? Hopefully for R& D purposes you can just use it manually?
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APO-CPN 5.6/120mm Lens |
P/N 12-023457 |
Price = $1,316 |
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Lens Adapter M50 to M39 |
P/N 21-017231 |
Price = $66 |
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Unifoc-76 Focus Mount |
P/N 21-013048 |
Price = $372 |
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M58 to M72 Adapter |
P/N 21-013052 |
Price = $57 |
- The back focal length of this lens (rear glass vertex to the sensor ) = 103.98mm. The above M58 to M72 adapter terminates with a Male M72 x 0.75 standard photographic thread. You can mount to this thread or use the adapter (it looks like a big washer 2mm thick) and drill 4 thru holes and use it as a mounting flange to hold / attached to your camera/sensor.
- All of the above items are standard parts for us.
Thanks for the above information to:
Stuart W. Singer
Vice President - Industrial Optics
Schneider Optics, Inc.
285 Oser Ave
Hauppauge, NY 11788
Phone: 1- 631-761-5000 ext. 204
Fax: 1-631-761-5090
Cell: 1-516-902-9079
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