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United States Patent | 6,644,111 |
Cytron , et al. | November 11, 2003 |
An apparatus for measuring exit velocity of a round from a muzzle of a gun barrel includes a first optical fiber having a first fiber optic Bragg grating (FBG) circumferentially attached to the gun barrel at the muzzle and a second FBG circumferentially attached to the gun barrel further from the muzzle than the first FBG; a coupler that receives one end of the first optical fiber; a light source connected by a second optical fiber to the coupler for supplying light to the first optical fiber; a third optical fiber comprising an FBG notch filter, the third optical fiber being connected to the coupler to receive light reflected from the first optical fiber; a notch filter mount attached to the gun barrel, the FBG notch filter being disposed in the notch filter mount; a photodetector connected to an end of the third optical fiber; and data processing electronics electrically connected to the photodetector.
Inventors: | Cytron; Sheldon J. (Mountain Lakes, NJ), LaVigna; Christopher J. (Olney, MD), Kwatny; Harry G. (Elkins Park, MD), Bowlus; Justin M. (Hyattsville, MD), Chen; Shiping (Fremont, CA) |
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Assignee: |
The United States of America as represented by the Secretary of the Army
(Washington,
DC)
|
Family ID: | 27757639 |
Appl. No.: | 10/248,666 |
Filed: | February 6, 2003 |
Current U.S. Class: | 73/167; 356/28; 73/35.15; 73/514.26 |
Current CPC Class: | F41A 21/32 (20130101); G01P 3/685 (20130101); F41G 3/12 (20130101) |
Current International Class: | F41G 3/12 (20060101); G01P 3/64 (20060101); G01P 3/68 (20060101); F41G 3/00 (20060101); G01L 005/14 (); G01N 033/22 (); G01P 015/08 (); G01P 015/13 (); G01P 003/36 () |
Field of Search: | ;73/35.15,167,514.26 ;250/231.19 ;356/28 |
5357796 | October 1994 | Jamison |
6175108 | January 2001 | Jones et al. |
6354147 | March 2002 | Gysling et al. |
6422084 | July 2002 | Fernald et al. |
6450037 | September 2002 | McGuinn et al. |
6536291 | March 2003 | Gysling et al. |
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