For a 6 inch solar cell, which grid resolution is suggested in planning a thermal solar inspection?

• A. 3x3 grid
• B. 4x4 grid
• C. 6x6 grid
• D. 5x5 grid

Answer: (D)

Sampling density across the cell surface matters because you want enough data points to spot hotspots without spending excessive time on data collection. For a 6 inch solar cell, a 5x5 grid gives 25 evenly spaced measurement points, providing solid coverage across the entire cell while keeping inspection time reasonable. This spacing is typically enough to detect moderate to small hot spots or irregularities without overloading you with data.

If you chose a 3x3 grid, you’d have only 9 points spread more widely apart, increasing the chance of missing smaller defects. A 4x4 grid adds more data points than 3x3 but still may leave gaps in coverage compared to 5x5. A 6x6 grid offers finer sampling, but that extra detail comes with more time and data to process, which isn’t usually necessary for Level 1 inspections.

So, 5x5 hits the balance between reliable defect detection and efficient inspection for a 6 inch cell.