Rotary wheels are used to enable speedy projections of different standard targets keeping at the same time stable temperature of the targets. 

Two basic types of rotary wheels are offered: manual  (RW series)  and motorized (MRW series). There are usually 8 or 12 holes for targets in the wheel (other numbers are also possible).  Wheels are covered with a black high emissivity coating (emissivity at least 0.97). 

Fig. 1. Photo of the MRW-8 rotary wheel integrated with TCB-2D blackbody

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