For linear illumination sources, rotating the line sensor
results in asymmetric vignetting.
The camera and illumination optics can be aligned optimally
monitoring the object illumination using the oscilloscope display.
Sensor alignment
non-ideal sensor alignment
Sensor and illumination optics are not aligned collinearly. The vignetting is asymmetric.
Good sensor alignment
Sensor and illumination optics aligned properly. The vignetting is symmetrical.