gas lens

gas lens

[′gas ‚lenz]
(optics)
An optical lens formed by a flow of gas which gives rise to gradients of refractive index that bring about the focusing of light.
References in periodicals archive ?
Tenders are invited for Quotations Are Invited For Supply Of Electrode, Gas Lens And Back Cap At Beml, Bangalore Complex
Accessories: tig welding torch with gas lens, long and short cap, ceramic nozzles accessories
Typically, pure argon provides the best results when welding 300 series pipe, and the addition of a gas lens can ensure gas is evenly distributed around the tungsten, arc and weld puddle.