MX-10160
MX-10160 is the designation for a specification for image intensifier tubes for the United States military.
The designation is often used to refer to the format of the tube specified inside of the specification, as all iterations of the specification reuse the same format to facilitate backwards compatibility.
This format, together with the sibling MX-11769 format, are the most common formats both in military and civilian applications as of today.
Format
Other names commonly used to refer to the format are:
- Small Anvis (because it was developed for AN/AVS-6 binoculars)
- 18 mm (because of the diameter of the core)
- 37 mm (because of the diameter of the tube)
Tubes of this format utilize a fiber twist to invert the intensified image, making the lens system of compatible oculars much simpler.
The format does not support manual gain. The later introduced sibling MX-11769 format as well as the gain contact subformat later added that missing feature.
Gain Contact Subformat
A subtype of the MX-10160 format introduced a third electrical contact between the two power contacts. The housing can then connect the negative (ground) contact and the new gain contact through a potentiometer (usual value: 50 kΩ). The gain is inverse to the selected resistance of the potentiometer. Tubes of this type can be made backwards compatible with housings designed for the original MX-10160 format by adding a thin wire between the aformentioned contacts on the tube. The image intensifier manufacturers Photonis uses this format for their manual gain image intensifiers.
Iterations
MX-10160/AVS-6
The original MX-10160/AVS-6 specification was introduced in 1989 in the MIL-I-49428 specification. [1]
It consists of many requirements that designated image intensifier tubes had to meet as well as how those requirements should be tested.
The specification was cancelled in 1997 in favor of later iterations.
Key Specifications
Below is an incomplete list of key specifications that the image intensifiers have to meet.
- 18mm microchannel wafer
- minimum useful photocathode and phosphor screen diameter of 17.5 mm
- maximum weight of 85 grams
- phosphor screen type P-20
- image inversion
- resistance to shocks of at least 75 G's
- equivalent background input of 2.5 * 10-11 lumens/cm2
- maximum luminance gain
- between 20.000 and 35.000 at 2 x 10-6 footcandles
- between 3.500 and 10.500 at 2 x 10-4 footcandles
- minimum signal-to-noise ratio of 16.2
- minimum resolution of 36 line pairs per millimeter (lp/mm)
- minimum high light resolution of 5 lp/mm (at 20 footcandles)
- modular transfer function at 8 x 10-4 footcandle:
- 83% MTF at 2.5 lp/mm
- 58% MTF at 7.5 lp/mm
- 28% MTF at 15.0 lp/mm
- 8% MTF at 25.0 lp/mm
- mean time to failure of minimum 7500 hours (minimum 1500 hours under accelerated conditions[2])
Some further specifications include:
- stability and uniformity of output brightness
- ion barrier film quality
- photocathode sensitivity
- burn-in / environmental stress screening
- vibration
- resonance search / resonance dwell / cycling
- temperature ranges / temperature cycling
- compatibility with the ANVIS monocular assembly
- reverse polarity protection
- resistance to bright lights
- allowable dark & bright spots
- veil glare
- image alignment
- electromagnetic interference
- assembly quality
- chicken wire
MX-10160A
MX-10160B
MX-10160C
MX-10160GS
MX-10160WG
MX-10160FG
- ↑ http://everyspec.com/MIL-SPECS/MIL-SPECS-MIL-I/MIL-I-49428_53852/
- ↑ Accelerated conditions differ only in shorter on-off cycles and more frequent temporary increases in input illumination.
