dynode


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dynode

[′dī‚nōd]
(electronics)
An electrode whose primary function is secondary emission of electrons; used in multiplier phototubes and some types of television camera tubes. Also known as electron mirror.
References in periodicals archive ?
It needs only one high voltage power supply and provides an additional signal, called the dynode, which is connected to all the last dynodes of each PSPM channel.
The monochromator is coupled to a 9-stage dynode R237 1 PMT mounted in a shielded temperature regulated semi-hermetic enclosure.
In full-scan modes for positive/negative chemical ionization, the system has picogram-level sensitivity: Other features: a new high-energy dynode electron-multiplier detector and a short-capillary direct interface.
One of these is Active Dynode Control, which prevents the nonlinear signal response so often associated with conventional resistive dynode dividers.
QUEZALES UNTIDILY ACHROMIC FLEABANE FERMENTS (81) HAPHAZARD AQUILEGIA SUCCORING TAEKWONDO (77) SCOFFLAWS HYPEREMIA AMATIVELY HALAZONES (77) HAMADA EXEQUY MIZUNA PLEACH YESSES (76) SNIPPER NONHOME EIDOLIC ESERINE ZONATED EMETINE RESECTS (75) HARIJAN ATOMIZE WASABIS EXIGENT DYNODES (74) PRELATE SEMILOG HEEZING ACTABLE WHIRLER SYNDETS (74) REPAST EXARCH DUNKER EVZONE FIESTA YAREST (73) The smallest size having a unique highest-scoring grid is 6x2; of the 72,093 6x2's, only one achieves the maximum score of 37.
Recording of real coincidences (in the start-stop arrangement) with a time resolution of 1.7 x [10.sup.-9] s [2] between the signal produced by a nuclear [[gamma].sub.n] quantum of energy [??] 1.28 MeV ("start") with the signal generated by the detected [[gamma].sub.a] annihilation quantum of energy [??]0.34 o 0.51MeV ("stop", corresponding, accordingly, to 3[gamma] and 2[gamma]-annihilation) is accompanied by the energy (amplitude) discrimination in the slow ("side") coincidence channels (with a resolution [delta][[tau].sub.s] ~ [10.sup.-6] s between the corresponding signals from the last-but-one dynodes of the lifetime PM tubes, an approach that cuts efficiently random coincidence noise.
A photomultiplier tube consists of a photo-emissive cathode and a series of dynodes in an evacuated glass enclosure.
The noise is then reduced to unavoidable dark currents due to the amplifying voltage between the cathode and the dynodes. With the use of a chopper, the equipment is able to register a real current density of 2 photons/(s [cm.sup.2]) at a significance level of 99.9% over theoretically 6 hours.
Night vision systems intensify reflected light that reach their dynodes, and require at least some ambient light to function, It is a simplification but generally correct to say that night vision systems are suitable for navigation and targeting for distances m easured in hundreds of yards, while FLIR enables pilots and gunners to pick out targets many kilometers away.