Position location in surface scanning using interval timing betw

Details Position location in surface scanning using interval timing betw Position location in surface scanning using interval timing betw

1990-07-17

1992-01-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250571, G01N 2186

Patent

active

050830350

ABSTRACT:
A particle imager and method for imaging particles on surfaces of substrates. A surface is raster scanned by a collimated light beam and particles on the surface are detected by the scattered light caused by the particles. During a scan path the intensity of the scattered light is measured forming intensity traces and location addresses for the detected particles. Data from each scan path is stored in memory. The imager is pre-calibrated with a test wafer having light scattering marker points spaced at known positions thereon. Scanning the test wafer, a clock measures time elapsed from a start position to each marker point. The corresponding elapsed times and known address locations are stored in memory for reference during data collection.

REFERENCES:
patent: 4329011 (1982-05-01), Mori et al.
patent: 4404596 (1983-09-01), Juergensen et al.

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