An area-scan camera captures a region as one image using a sensor with pixels arranged in rows and columns. It is useful for inspecting a part’s overall shape, position, markings or assembly state.
Fit the required area into one image
The lens and working distance determine the field of view. With a fixed pixel count, a wider field means each pixel covers a larger area on the target. Choose the field of view and resolution from the smallest scratch or character you need to see.
Area scan does not require scanning motion to form an image. It can also capture moving parts at a specified trigger timing.
As a sampling example, a 100 mm field of view across 2,000 pixels gives 0.05 mm/pixel. This does not guarantee detection of a 0.05 mm scratch. Check lens resolution, contrast and the number of pixels covering the feature in actual images.
Check exposure and shutter for moving targets
Movement during exposure creates blur. Select a short enough exposure for the transport speed and provide enough light within that time.
Shutter type also matters. Global and rolling shutters expose pixels at different times, affecting motion distortion. Check speed, allowable distortion and lighting timing together.
Balance illumination across the field and contrast at the feature
A bright center with dark edges can make inspection more difficult. Check both field-wide uniformity and the visibility of scratches, markings and contours.
On reflective surfaces, lighting angle changes appearance. Choose the lighting type and size for the capture area. Lighting intended for a line camera is not necessarily suitable for a broad area.
Choose between area scan and line scan
Start by deciding whether to capture a complete part at once or use movement to capture a continuous surface. High-resolution models exist in both categories; camera type alone does not establish superiority.
- Stationary or intermittently transported parts: consider area scan first
- Continuous sheets or long surfaces: consider line scan
- Processes suited to either: define comparison conditions and compare resolution, speed and installation needs
References: Basler — Area Scan Cameras, camera documentation. Confirm supported modes and settings for the actual model.
