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A Philips pyroelectric detector is used as a precise infrared beam positioner (λ=6.5–14 μm). The accuracy in X and Y direction is ≤±10 μm (≤±40 μm) for beam diameters of 2w=0.3–10 mm (10–35 mm). Furthermore, this detector allows the determination of beam diameters exceeding 4 mm.