Note: Hermetically sealing a fiber optic cable in a kovar ferrule

Objective:

Soldering a fiber optics cable in a ferrule to form a hermetic seal

End Product:

fiber optics cable

Equipment:

Ambrell 1.2 kW induction heating system, equipped with a remote workhead containing one 0.66μF capacitor.
An induction heating coil designed and developed specifically for this application.

Materials:

Panda PM fiber 0.0098 in (.25 mm) ∅ kovar ferrule 0.086 in (2.2 mm) ∅ and metal enclosure 1.96 x 1.06 x 0.23 in thick (50  x 27  x 5.9 mm thick), solder preforms and flux

Temperature:

450 °F (232 °C)

Frequency:

346 kHz

Testing:

A single turn channel C-shaped coil is used for this soldering application. Assembly is fluxed at the joint area and power is applied for 15 seconds to create the hermetic seal in the ferrule. The customer chose Ambrell over competitors due to the ability to design the single channel C coil. The coil heats quickly so that the heat does not travel to heat sensitive components in the case

Benefits:

Induction heating provides:

  • Instant start up time requiring very little power resources

  • Targets small areas with pin point accuracy

  • Clean source of heat

  • Easily integrated into existing automated systems

  • Even distribution of heating

Hermetically sealing a fiber optic cable in a kovar ferrule

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