What's the meaning of the spots ?
2022-07-08
Spots are little black spots that can appear in an intensifier tube. It happens during the actual manufacturing process of the image intensifier tube. Because the manufacturing process for image intensifiers is highly technical and intricate.
Like all manufacturing, consistent perfection is unrealistic, so acceptable standards were created.
1: A spot spec is the number and location of allowable spots in a tube. For a spot to count as a spot it must be larger than .003” in diameter. It is important to note that spots smaller than .003” are a possibility and are often described as pepper.
2: Spot specs on tubes vary, but there are three main categories of spot specs: Commercial, Mil-spec, and Aviation. These three spot specs all have different allowances across the zones of the tube
A commercial spot spec is the broadest spot spec. These are tubes that fail mil-spec acceptance testing. Commercial spot specs differ from the manufacturer but generally speaking if is max of 4 spots greater than .003” per tube with an allowable zone 1 spot. The allowance for a zone 1 spot larger than .003” is what typically sets a commercial spot spec apart from a mil-spec spot spec. The following tube picture is an example of an acceptable tube per a commercial spot spec.
Pictured above is a commercial grade spot spec example. This tube reads 3 spots, one in zone 1, one in zone 2, and one in zone 3.
We will never sell commercial grade spots spec night vision goggles to customers in our factory！
A mil-spec spot spec is what has been accepted by the military to meet their ground tube needs. A mil-spec spot spec is what comes standard in mil-spec tubes. A mil-spec spot spec allows for a max of 4 spots greater than .003”per tube with no spots in zone 1 greater than .003”. Within this max of 4 allowable spots, there can be no more than 3 spots in zone 2 or 3 in one tube. Like every spot spec, spots equal to or smaller than .003”are acceptable in any zone and do not count as spots.
Pictured above is a mil-spec grade spot spec example. This tube reads two spots, one spots in zone 2 & one spot in zone 3.
Pictured above is our generation 3 night vision goggles, only one spots in zone 2, much better than the mil-spec grade, you will get it.
The strictest spot spec available is an aviation spot spec. Aviation spot specs were created at the request of the military to have cleaner tubes for their strict aviation needs. An aviation spot spec is maxed 3 spots per tube which are only allowable in zone 3. With no allowable spots greater than .003” in zone 1 or 2 the aviation spot spec is best for those who need the cleanest tubes possible.
Pictured above is an aviation grade spot spec example. This tube reads no spots larger than .003″ but slight peppering is visible in zone 1 & 2 (zoom in to see clearer)
Pictured above is our generation 3 night vision goggles, Let us use our night vision goggles to compare aviation standards, and from the pictures, the quality is comparable.
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