Which image intensifier error is caused by external magnetic fields?

The error caused by external magnetic fields in image intensifiers is S-shaped distortion. This occurs when the magnetic fields interfere with the operation of the image intensifier, distorting the path of electrons as they travel through the tube. As a result, this distortion appears visually as an S-shape or a wave-like bending of the images projected through the intensifier, particularly around the periphery of the image, leading to inaccuracies in the displayed image.

Understanding this phenomenon is vital for ensuring high-quality imaging in various applications, as it highlights the sensitivity of image intensifiers to environmental factors. Adopting measures to minimize the effects of magnetic fields can improve image quality and consistency, indicating the operational limitations and requirements of these imaging devices.