Boresight thermal reference source

Details Boresight thermal reference source Boresight thermal reference source

G - Physics

01

S

G01S 7/497 (2006.01) F41G 7/00 (2006.01) G01J 5/00 (2006.01) G01J 5/52 (2006.01) G01S 17/06 (2006.01) G05D 1/12 (2006.01)

Patent

CA 2162195

A boresight thermal reference source (100) capable of rapidly providing a uniform high intensity Long Wave Infra-Red signal, comprises a boresight source housing (110), a ceramic rod (102), and a heater wire (104) helically surrounding, at least partially, the ceramic rod (102). The coiled heater wire (104) has a plurality of turns extending outwardly from one end (108) of the ceramic rod (102) forming a blackbody cavity (106) therein from the plurality of outwardly extending turns on the end (108) of the ceramic rod (102). The small mass of ceramic rod (102), optimum geometry of ceramic rod (102), heater wire (104), and housing (110) for reduced heat loss, and the aforementioned blackbody cavity (106) configuration, all provide for low operating power with uniform rapid heating of one end (ceramic floor (108)) of the ceramic rod (102) to about 1000°C. The coiled heater wire (104) is heat treated to maintain its shape. Lastly to maintain geometry and precisely locate the signal, the heater wire (104) and ceramic rod (102) are held firmly in place by threading of the wire, both the heater wire (104) and a twist wire (120), through a plurality of holes and slots in the boresight source housing (110) and ceramic rod (102).

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