AO-21841 Image Intensifier Tube (Photonis ECHO)

You are here

AO-21841 Image Intensifier Tube (Photonis ECHO)

Key Features:

- Automatic brightness control (ABC)

- Bright source protection (BSP)

- High-voltage power supply


PDF icon Download Spec Sheet (918.26 KB)
Resolution, lp/mm57 - 74
Luminance gain (at 20 µlx), cd/m²/lx8000 - 12000
Maximum Output Brightness, cd/m²4 - 8
Halo (illumination spot 0.35mm), mm, max.0.95
Signal-to-Noise Ratio, min24
Image alignment, mm, max.0.5
Useful diameter of photocathode, mm minimum17.0
Equiv. background illumin., μlx, max.55-90 g
MTTF, hours10000
Weight, g90


The AO-21841 is 18mm, Gen 2+, high-gain, high-photosensitivity Inverting Image Intensifier Tube (Photonis ECHO) encapsulated within a hard-surface insulating sleeve and suitable for passive night vision systems and goggles. The AO-21841 consists of a high-efficiency S-25 multialkaline metal photocathode on a twisted fiber optic output window; glass input window; micro-channel plate (MCP) current amplifier.

The AO-21841 has a built-in high-voltage power supply with overload protection circuit which incorporates (ABC) automatic brightness control to provide constant output image brightness as light levels varies. The power supply also provides (BSP) bright source protection to guard the tube against exposure to high levels of light and autogating feature to protect the tube against exposure to high levels of light.

The AO-21841 comes in the “Slim” ANVIS format and compatible with BNVD-15, PVS-14, or MUM-14 type devices. Options with the White Phosphor screen and manual gain control are available.