Dark field, photon tunneling imaging systems and methods for mea

Details Dark field, photon tunneling imaging systems and methods for mea Dark field, photon tunneling imaging systems and methods for mea

1996-06-28

1998-02-17

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

G01B 1114

Patent

active

057196770

ABSTRACT:
A dark-field imaging system and method is disclosed that employs photon tunneling to measure the height of read/write heads at full-field and in substantially real-time as the head flies over a disk-shaped recording medium. The system comprises: an analog recording disk mounted for rotation about a central axis, an illumination section for providing an evanescent field at a surface of the disk where the evanescent field is selectively scattered in correlation to the proximity of the read/write head to the disk surface, and a collection section for transmitting the scattered evanescent field to an imaging section, which may be a vidicon, digital camera, or other photo detector device. Various embodiments are disclosed including the use of a bulk optic prismatic element, the forward aplantic element of a compound microscope objective, diffracting gratings, and optical waveguides. In each embodiment the collection section and illumination section may be completely optically, and thus physically, uncoupled.

REFERENCES:
patent: 4681451 (1987-07-01), Guerra et al.

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