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Optical Engineering

High-resolution optic displacement measurement using a dual photodiode sensor
Author(s): John L. Remo
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Paper Abstract

Comparative displacement measurements are made using laser diode (LD) and light emitting diode sources, fiber optic collimators, and a dual-photodiode detector (DPD). It is shown that a relative displacement resolution < 2 nm is possible with the LD source. This result is interpreted to indicate that the coherent LD sources illuminating the DPD temporally correlates the mutual irradiation function of the signals between each photodiode segment and significantly reduce electronic (shot) noise, reduces the variance, and thereby enhances resolution.

Paper Details

Date Published: 1 August 1997
PDF: 8 pages
Opt. Eng. 36(8) doi: 10.1117/1.601454
Published in: Optical Engineering Volume 36, Issue 8
Show Author Affiliations
John L. Remo, E.R.G. Systems, Inc. (United States)


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