Hermetic seal for window usable with infrared detector

Details Hermetic seal for window usable with infrared detector Hermetic seal for window usable with infrared detector

F - Mech Eng,Light,Heat,Weapons

16

B

88/15, 33/48, 26

F16B 11/00 (2006.01) C04B 37/02 (2006.01) H01S 3/034 (2006.01)

Patent

CA 1234691

Abstract A method of securing a window (12) of crumbly material in the end of a tube (10) so as to effectively prevent leakage during temperature cycling, first involving the step of selecting a window (12) having a small clearance when placed inside the end of the tube (10). Any conta- mination is removed from the periphery of the window (12), and then a thin metallic layer (22) that will ac- cept nickel plate is vapor deposited around the periphe- ry of the window (12). Subsequently, a hoop (26) of ten- silly stressed nickel plate is applied over the thin me- tallic layer (22), after which the window (12) and tube (10) are sweated together by the application of suitable amounts of solder (24) and heat. Significantly, the hoop (26) of nickel serves to keep the window (12) in conti- nuous compression, such that leakage between the window (12) and tube (10) is effectively prevented. Fig. 3

481959

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