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Targets

Infrared targets Visible targets

INFRAMET offers two types of targets for testing electro-optical imaging systems:
a) Targets for testing infrared imaging systems (thermal imagers)
b) Targets for testing visible and near infrared imaging systems (TV cameras or night vision devices).

Targets for testing infrared imaging systems are manufactured by  creating precision holes in metal sheets  of different shapes. When a blackbody is put behind such a target, the tested  thermal camera sees a "target" of shape determined by the holes on an uniform background.  The apparent temperature of this "target" is equal to blackbody temperature; the apparent temperature of the background is equal to the temperature of the real target plate.

Fig. 1. Photo of an double 4-bar target 

Fig. 2. Image of a  4-bar target (generated by a tested imager during MRTD measurement)

In order to achieve high thermal uniformity on the surface of the target, the targets are manufactured by cutting the desired holes in a thick metal sheets of high thermal conductivity. Next, the one side of the targets is coated using a special high emissivity black coating (> 0.97). This side of the targets should look into the direction of the IR collimator (or in the direction of the tested thermal camera).  The second side of the target is coated using a high reflectivity coating in order to minimize influence of  other radiation sources on target temperature. The targets are  fixed to the MRW rotary wheel or to the TCB series blackbodies.

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Targets for testing visible and near infrared imaging systems are manufactured by creating opaque or semi-transparent coatings on transparent glass substrate.  When a diffuse light source is put behind the target then the tested visible range imaging system see a "target" formed by the coating on an uniform bright  background (in case of positive contrast targets).

Fig.3. Image of the USAF 1951 target  (generated by the tested ICCD camera during MRC measurement)

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