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|United States Patent||8,253,932|
|Cole||August 28, 2012|
A near-IR laser laser-and-corner cube system for determining the refractive-index structure parameter by providing the return power of the retroreflected laser beam from the corner cube, which return power correlates to the refractive-index structure parameter. The system is economical, physically containing only (1) the laser which emits a near-IR wavelength output beam, (2) a 50/50 splitter, to receive back the retroreflected return beam from the corner cube along the same optical axis as the output beam, in a monostatic configuration; (3) the target corner cube; (4) a receiving focus lens; (5) a spectral filter and (6) a power meter to provide the monostatic measurement of the return power. Critically the ratio of the area of the corner cube to that of the receiving focus lens is at least 1:2, to obtain meaningful power measurements--to correlate to pre-calculated refractive-index structure parameters.
|Inventors:||Cole; Walter P. (Springfield, VA)|
The United States of America as represented by the Secretary of the Army
|Filed:||June 21, 2010|
|Current U.S. Class:||356/128; 356/445|
|Current CPC Class:||G01N 21/41 (20130101); G01N 2021/4113 (20130101)|
|Current International Class:||G01N 21/41 (20060101); G01N 21/55 (20060101)|
|Field of Search:||;356/128-137|
|4632563||December 1986||Lord, III|
|5532813||July 1996||Ohishi et al.|
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