Experimental Setup

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A schematic diagram of the experimental setup is shown in Fig. 1.

A schematic diagram of the experimental setup is shown in Fig. 1.

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Figure 1. Experimental setup.

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Figure 1. Experimental setup.

The source is a pinhole illuminated by a regulated lamp through an optical fibre bundle. Narrow-band filters could be added to verify wavelength dependence. There is a PK50 IR cut filter (cutoff at 2.5 ^m) mounted in the face plate of the inner radiation shield to reduce the background. Mounted 4 mm in front of the detector is a small plano-convex lens (6.1 mm focal length, 2.2 mm aperture). Initial tests with a 160 ^m pinhole at a distance of ~180 mm from the lens and white light show what appears to be reasonable sub-pixel resolution (~4^m).

The pinhole is mounted on a two-axis motorized micrometer stage. The actuators have an accuracy of 0.1 ^m, which is more than adequate given the demagnification of the optics.

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