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electrometallurgy
2 Control of engine fuel system by electrical signals.
electrometallurgy Use of electricity for smelting,
refining, welding, annealing and other processes, and for
electrolytic separation of metals and deposition from
solutions.
electromotive force External electrical pressure
(measured at source) which tends to produce flow of electrons
in conducting medium; volt is ** required to
maintain current of one ampere through resistance of one
ohm.
electron Subatomic particle that possesses smallest
negative charge, and which is so-called “fundamental
particle” assumed to be building block of the
Universe; mass at rest m c = 9.1093897 × 10 –28 g, negative
charge 1.60217733 × 10 –19 coulombs; charge/mass ratio
e/m c = 1.7588 10 11 C kg –1 .
electron beam Stream of electrons focused by magnetic
or electrostatic field and used for neutralisation of positively
charged ion beam and to melt or weld materials with
high melting points. Also called cathode ray.
electron-beam lithography ‘Writing’ parts of an integrated
circuit (microchip) by means of beam of electrons.
electron-beam welding Use of powerful focused beam of
electrons to make precision weld on workpiece in vacuum.
electron charge Unit, symbol e, –1.602 × 10 –19 C.
electron gun Electrode structure which produces and
may control one or more electron beams to produce TV
picture or weld material.
electronic ADI Attitude director indicator incorporating
a CRT display forming part of an EFIS.
electronic charge Electron charge.
electronic cloth Rapidly growing range of microelectronics
based on low-cost flexible substrates.
electronic combat See electronic warfare.
electronic counter-countermeasures Subdivision of EW;
actions to ensure effective use of electromagnetic radiation
despite enemy use of countermeasures.
electronic countermeasures Subdivision of EW; actions
to reduce or exploit effectiveness of enemy electromagnetic
radiation.
electronic data-processing System using electronic
computer(s) and other devices in gathering, transmission,
processing and presentation of information.
electronic deception Deliberate radiation, reradiation,
alteration, absorption or reflection of electromagnetic
radiation, to mislead enemy in interpretation of data or
present false indications; manipulative ** is alteration
or simulation of friendly electromagnetic radiations to
accomplish deception; imitative ** is introduction into
enemy channels of radiation which imitates his own emissions.
electronic defence evaluation Mutual evaluation of
radar(s) and aircraft by means of aircraft trying to
penetrate radar through ECM.
electronic drop tube A multistation flight-strip manager.
electronic flight bag Software and data-services solution
to digitize logbooks, charts and other flight documents to
achieve paperless cockpit. Class 1, usually COTS,
including laptops; Class 2, the same, but connected to
aircraft systems when in use, so requires approval; Class
3, installed equipment [AC-120-76A] (FAA).
electronic flight-control unit Computer controlling
surfaces used as spoilers and airbrakes, with or without
roll-control function.
electrostatics
electronic flight instrument[ation] system Replaces traditional
flight instruments by full-colour CRT displays
(typically three 200 × 200 nm, 8 × 8 in, for each pilot) each
reprogrammable to operate in different modes and giving
high redundancy.
electronic interference Disturbance that causes undesirable
response in electronic equipment.
electronic intelligence Detection, recording, analysis and
cataloguing (where possible, linking with particular emitters)
of all unfriendly EM emissions.
electronic jamming Deliberate radiation, reradiation or
reflection of electromagnetic signals with object of
impairing use of electronic devices by enemy.
electronic line of sight Path traversed by electromagnetic
waves not subject to reflection or refraction by
atmosphere.
electronic protective measures Generally synonymous
with electronic countermeasures.
electronics Branch of physics concerned with emission,
transmission, behaviour and effects of electrons.
electronic scanning Scanning by cathode-ray tube, or
sequenced emission from larger planar antenna array,
instead of by mechanical means.
electronic technical log Manages civil airline fleet data
including trip reports and maintenance requirements.
electronic warfare (also electronic combat) Use of
electromagnetic emissions as a weapon or a source of
intelligence.
electron multiplier Electron tube which delivers more
electrons at output than it receives at input, because of
secondary emission.
electron tube Gas-filled tube having anode, cathode
and sometimes other electrodes for controlling flow of
electrons.
electron-volt See eV.
electro-optical guidance EO guidance makes use of
visible (optical) contrast patterns of target or surrounding
area to effect seeker lock-on and terminal homing. Three
such systems are contrast edge tracker (Mk 84 EOGB and
Walleye); contrast centroid tracker (Maverick); and
optical area correlator, which scans contrast patterns in
large area surrounding target.
electro-optic converter Device which converts electricity
into laser pulses for fibre-optic sensors.
electro-optics Electronics involving visible or nearvisible
light, eg TV.
electroplating Coating metal with deposit removed from
electrode and carried by electrolyte in which object to be
coated is immersed.
Electropult Patented assisted-takeoff device, in effect a
d.c. motor “unrolled” (US c1940).
electrostatic capacity Measure of ability to hold electric
charge, unit Farad, symbol F.
electrostatic deflection Bending of electron beam during
passage through electric field between two parallel flat
electrodes; beam is deflected towards positive electrode.
electrostatic focusing Use of electric field to focus stream
of electrons to small beam.
electrostatic precipitation Use of high voltages (large
potential gradients) to remove particulate matter from gas
flow, smoke or other volumes.
electrostatic rocket See ion rocket, ion engine.
electrostatics Study of electricity (charges) at rest.
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