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6 terms
Photonics Dictionary: U
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OE x
U x
ultraviolet photoemission spectroscopy
A technique for measuring the energy spectrum of electrons emitted during the absorption of ultraviolet radiation. This spectrum reveals the characteristic ionization energies of the molecules and...
UOE
unit of error
unit of error
A unit of measurement in a rangefinder corresponding to 12 s of arc in the apparent field.
ultrasonic camera
A device that uses a piezoelectric crystal to convert ultrasonic sound waves, transmitted through a subject, into a voltage that modulates the electron beam of a cathode-ray tube.
umbra
->
penumbra
A source of light will not cast a distinct shadow of an interfering, opaque object, but will cast a shadow having two parts: 1. the umbra, or the central, totally dark part of the shadow; and 2. the...
unimorph
A piezoelectric transducer made of a thin strip of piezoelectric material bonded to a strip of metal.
Photonics Dictionary
U
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