Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1997-03-17
2000-11-14
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
G01J 3443, G01N 2163
Patent
active
061477540
ABSTRACT:
A LIBS cone penetrometer comprises a decoupling mirror to separate an excitation signal and a response signal, an optical fiber arranged with the decoupling mirror for receiving the excitation signal from an energy source and transmitting the response signal from a sample surface, and a cone penetrometer probe connected to the distal end of the optical fiber. The probe further comprises a collimating lens arranged with the optical fiber for collimating the excitation signal and for directing the response signal into the optical fiber. An internally reflecting prism is aligned with the collimating lens to deflect the excitation signal and the response signal between the collimating lens and the sample surface through a window in the side of the probe. A focusing lens is aligned with the prism and the window to reduce the spot size of the excitation signal and to collimate the response signal. The window is arranged with the focusing lens to maintain the distance between the focusing lens and the sample surface and to prevent outside matter from entering the probe.
REFERENCES:
patent: 5128882 (1992-07-01), Cooper et al.
patent: 5316950 (1994-05-01), Apitz et al.
patent: 5379103 (1995-01-01), Zigler
"Remote in-situ detection of heavy metal contamination in soils using a Fr Optic Laser Induced Breakdown Spectroscopy (FOLIBS) System", Symposium Proceedings, Jun. 19-23, 1995.
Knowles David S.
Lieberman Stephen H.
Martini Leonard J.
Theriault Gregory A.
Evans F. L.
Fendelman Harvey
Kagan Michael A.
The United States of America as represented by the Secretary of
Whitesell Eric James
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