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4 terms
Photonics Dictionary: H
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physics x
H x
heat treating
The process of subjecting glass to temperature cycling to produce physico-chemical reactions that alter its properties. Similar processes can be accomplished with a laser -- most commonly a CO2,...
Hefner unit lamp
A gas lamp used in the early 1900s as a physical standard for measurement of luminous intensity. The Hefner unit was superseded by the candle and then by the candela.
holographic nondestructive testing
The application of coherent wavefront techniques to the determination of the physical state of a system without appreciably altering that state.
Hubble effect
->
redshift
The displacement of spectrum lines, as determined by the increasing distance between, and the relative velocity of, the observer and a light source, causing the lines to move toward the red portion...
Photonics Dictionary
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