Which of the following is NOT a main component of a Clover Image Intensifier?

The main components of a Clover Image Intensifier include the input phosphor, output phosphor, and photocathode. The input phosphor is crucial as it converts incoming X-ray or scintillation light into visible light. This visible light is then converted into electrons by the photocathode, which amplifies the signal. Finally, the output phosphor converts these amplified electrons back into visible light, making the image visible for observation or further processing.

The digital sensor, while it may be used in modern imaging systems to capture and process images, is not a fundamental component of a traditional Clover Image Intensifier. The intensifier itself primarily relies on the principles of light and electron conversion rather than direct digital capture. Thus, it stands out as the component not integral to the operation of the Clover Image Intensifier.