ANVIS operational defects are listed as which of the following sets?

ANVIS operational defects are listed as which of the following sets?

• A. Dust intrusion, Lens haze, Glare, Bright spots
• B. Lens distortion, Ripple, Vignetting, Chromatic aberration
• C. Backscatter, Fogging, Cracking
• D. Edge glow, Flashing/Flickering, Shading, Emission Points

Answer: (D)

The main idea here is recognizing defects that come from the image-intensifier tube itself, not from external contamination or scene factors. When evaluating ANVIS for operational health, you look for internal image irregularities that indicate tube aging or malfunction. The set that lists edge glow, flashing/flickering, shading, and emission points matches those internal image-tube defects. Edge glow appears as a bright halo around the image edge due to nonuniform gain, usually from tube aging. Flashing or flickering is an unstable brightness from power/drive irregularities or tube degradation, showing up as intermittent brightness changes. Shading is nonuniform brightness across the field, another sign of gain variation or wear. Emission points are localized bright spots caused by defects in the photocathode or phosphor screen, which degrade image quality. These are classic indicators of operational issues inside the tube itself. Other sets describe external factors like dust intrusion, lens haze, glare, backscatter, or fogging—conditions that affect performance but are not the internal operational defects listed for ANVIS.

The main idea here is recognizing defects that come from the image-intensifier tube itself, not from external contamination or scene factors. When evaluating ANVIS for operational health, you look for internal image irregularities that indicate tube aging or malfunction.

The set that lists edge glow, flashing/flickering, shading, and emission points matches those internal image-tube defects. Edge glow appears as a bright halo around the image edge due to nonuniform gain, usually from tube aging. Flashing or flickering is an unstable brightness from power/drive irregularities or tube degradation, showing up as intermittent brightness changes. Shading is nonuniform brightness across the field, another sign of gain variation or wear. Emission points are localized bright spots caused by defects in the photocathode or phosphor screen, which degrade image quality. These are classic indicators of operational issues inside the tube itself.

Other sets describe external factors like dust intrusion, lens haze, glare, backscatter, or fogging—conditions that affect performance but are not the internal operational defects listed for ANVIS.