Line scan camera is widely used in the AOI, print detection, detects a nonwoven fabric, leather testing, the railway track detection, screening and color sorting and other industries. This article brings line scan camera of introduction and selection.
First, the line scan camera introduction
1) line scan camera concepts:
Is a linear CCD camera corresponding to the image size, pixel size, high-performance line sensor cameras FA lens, can be applied to various high-precision inspection.
2) line scan camera features:
1. Designed for high-resolution applications designed to scan up to 12K;
2. The maximum compatible imaging target surface is 90mm, a longer line-scan camera;
3. The high resolution, the minimum pixel size up to 5um;
4. Low distortion;
The magnification of 0.2x-2.0x
Second, select the line scan camera Notes
Why in the election camera lens selection to consider it? Common line camera resolution there are 1K, 2K, 4K, 6K, 7K, 8K, 12K several, pixel size has 5um, 7um, 10um, 14um Several such chip size from 10.240mm (1Kx10um) to 86.016mm (12Kx7um) range.
Obviously, the C interface can not meet the requirements, because the maximum C interface can be connected to 22 mm chip, which is 1.3inch. Many camera interface for F, M42X1, M72X0.75 etc., different interface corresponds to the back of the lens focus (Flange distance), will determine the working distance of the lens is not the same.
1) The optical magnification (β, Magnification)
And determining the resolution of the camera pixel size, the chip size can be calculated (Sensor size); chip size divided by the field of view (FOV) is equal to the optical magnification. β = CCD / FOV
2) Interface (Mount):
There are C, M42x1, F, T2, Leica, M72x0.75 several, after determining, you can know the length of the corresponding interface.
3) The back focus (Flange Distance)
The back focal plane of the interface refers to the distance from the camera chip, is a very important parameter, is determined by the design of the camera according to the manufacturers own light path. Different manufacturers of cameras, even if it is the same as the interface may also have different back focus.
4）MTF
With an optical magnification, an interface, the back focus can be calculated from the length of the working section and the ring. After selecting these, there is another important aspect is to see whether the value of MTF good enough? Many engineers do not understand the visual MTF, while the high-end camera, it must be used to measure the optical quality of the MTF.
MTF covers a wealth of information contrast, resolution, spatial frequency, color, etc., and is expressed in detail and the optical center of the lens quality throughout the edge. Not just working distance, field of view to meet the requirements, the contrast edge is not good enough, we must reconsider whether to choose a higher resolution camera.
Third, the line scan camera selection
East DZO positive optical line scanning lens support 2K to 16K nearly all types of industrial line camera. It has a high-resolution, up to 200lp / mm, ultra-low distortion, and good color correction capabilities.
Meet the AOI, print detection, detects a nonwoven fabric, leather testing requirements, railway track detection, screening and other selected color linear array detection. And can provide customers with better lens product selection services to help customers better complete the project.