How Far that Thermal Camera Can See?

时间： 2023-03-01 来源：DYT News

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To understand how far a thermal camera (or infrared camera) can see, firstly you need to know how big size the object you want to see is. Besides, what is the standard of "seeing" you define exactly?

Generally speaking, the "seeing" would divide into several levels:

1. Theoretical maximum distance: as long as there is one pixel on the thermal imaging screen to reflect the object, but in this case, there will be no accurate temperature measurement

2. Theoretical temperature measurement distance: when the targeted object is able to measure the accurate temperature, it generally needs at least 3 pixels of detector reflected on the device, so the theoretical temperature measurement distance is the amount that the object can cast 3 pixels on thermal imaging camera.

3. Only observation, no temperature measurement, but identifiable, then this requires a method called the Johnson Criterion.

This criterion includes:

(1) fuzzy outlines are visible

(2) shapes are recognizable

(3) details are recognizable

Maximum imaging distance

= number of vertical pixels × target size (in meters)×1000

Vertical field of view×17.45

or Number of horizontal pixels × target size (in meters)×1000

Horizontal field of view×17.45

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本文由福尔摩斯evelyn转载自DYT News，原文标题为:How far that thermal camera can see?，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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