TERMIUM Plus^®

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As SAR [synthetic aperture radar] is a coherent imaging system two forms of change detection may be considered, namely incoherent and coherent change detection. Incoherent change detection identifies changes in the mean backscatter power of a scene typically via an average intensity ratio change statistic. Coherent change detection on the other hand, identifies changes in both the amplitude and phase of the transduced imagery using the sample coherence change statistic.  3, fiche 1, Anglais, - coherent%20change%20detection

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coherent change detection; CCD: designations standardized by NATO.  4, fiche 1, Anglais, - coherent%20change%20detection

Fiche 1,  Justifications,  Français

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détection de changement cohérent; CCD : désignations normalisées par l'OTAN.  3, fiche 1, Français, - d%C3%A9tection%20de%20changement%20coh%C3%A9rent

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Fiche 2,  Justifications,  Anglais

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A measure of the rate of decrease of amplitude in a damped oscillation.  1, fiche 2, Anglais, - damping%20coefficient

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It is equal to the ratio of one amplitude to the next in the same direction. It is also equal to the logarithmic decrement divided by the periodic time of the oscillation. In an electrical resonant circuit the damping coefficient is related to the circuit constants, being given by R/2L where R is the series resistance in the circuit and L is the inductance.  1, fiche 2, Anglais, - damping%20coefficient

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Fiche 2,  Justifications,  Espagnol

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[El] coeficiente de amortiguación interna [...] es el coeficiente entre un máximo de amplitud y el que le sigue, provenientes de un impulso de excitación.  1, fiche 2, Espagnol, - coeficiente%20de%20amortiguaci%C3%B3n

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coeficiente de amortiguación interna  1, fiche 2, Espagnol, - coeficiente%20de%20amortiguaci%C3%B3n

Fiche 3,  Justifications,  Anglais

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Energy spectroscopy. For energy analysis the output current pulse from a PMT [photomultiplier tube] or from a semiconductor detector is often applied to a charge-sensitive preamplifier. The preamplifier produces a voltage pulse with a peak amplitude that is proportional to the total charge in the current pulse, which is proportional to the energy absorbed from the incident radiation. Amplifiers and filters are used to expand the range of the peak amplitude and to shape the signal from the preamplifier, a process that maximizes the signal-to-noise ratio for the system. For energy analysis the peak amplitude of the shaped pulse represents the information of interest. Discriminators and single-channel analyzers(SCA) can be used, following the signal shaping system, to determine the presence of certain energies of detected radiation. A discriminator produces an output logic pulse if it's input signal exceeds a preset threshold level. An SCA produces an output logic pulse if the peak amplitude of it's input signal falls within the energy window that is established with two preset threshold levels.  1, fiche 3, Anglais, - energy%20spectroscopy

Fiche 3,  Justifications,  Français

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[Dans un détecteur fonctionnant en impulsion] La mesure de la hauteur d’impulsion fournit […] l’information énergie puisque celle-ci est proportionnelle aux charges créées dans le détecteur. Ce mode de fonctionnement est utilisé en spectroscopie d’énergie.  1, fiche 3, Français, - spectroscopie%20d%26rsquo%3B%C3%A9nergie

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Fiche 4,  Justifications,  Anglais

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A form of quadrature phase shift keying where the quadrature component of the signal is offset from the in-phase component by half a symbol period.  1, fiche 4, Anglais, - offset%20quadrature%20phase%20shift%20keying

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As a result the amplitude does not cross zero, and this reduces the peak to average ratio. This has advantages for power amplifiers because it reduces the peak to average ratio and as a result it is used in the reverse link for CDMA [code division multiple access] transmissions.  1, fiche 4, Anglais, - offset%20quadrature%20phase%20shift%20keying

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Fiche 5,  Justifications,  Anglais

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[Of a gyro] The ratio of the change in output due to angular vibration about a sensor axis divided by the amplitude of the angular vibration causing it.  1, fiche 5, Anglais, - angular%20vibration%20sensitivity

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Influence des vibrations angulaires de l'axe de rotation.  2, fiche 5, Français, - sensibilit%C3%A9%20aux%20vibrations%20angulaires

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Fiche 6,  Justifications,  Anglais

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Ratio of the control flow amplitude to sinusoidal input signal amplitude at a particular frequency, normalised by using a specified flow frequency as datum at the same input signal.  1, fiche 6, Anglais, - amplitude%20ratio

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Rapport de l'amplitude du débit modulé à l'amplitude du signal d'entrée sinusoïdal pour une fréquence particulière; normalement on utilise une basse fréquence définie, comme référence du même signal d'entrée.  1, fiche 6, Français, - rapport%20d%27amplitude

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Fiche 7,  Justifications,  Anglais

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The non-dimensional ratio of the response amplitude of a system in steady-state forced vibration to the excitation amplitude. The ratio may be one of forces, displacements, velocities or accelerations.  1, fiche 7, Anglais, - transmissibility

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Rapport sans dimension du module de la réponse d'un système en régime stabilisé de vibration forcée au module d'excitation. Ce peut être un rapport de forces, de déplacements, de vitesses ou d'accélérations.  1, fiche 7, Français, - facteur%20de%20transmission

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Fiche 8,  Justifications,  Anglais

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A frequency-modulation detector circuit that uses two diodes and requires no limiter at its input; the audio output is determined by the ratio of two developed intermediate-frequency voltages whose relative amplitudes are a function of frequency.  2, fiche 8, Anglais, - ratio%20detector

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A ratio detector... is a discriminator operating on the same principle as the Foster-Seely discriminator but less sensitive to amplitude modulation. The coupling circuit and the addition of the primary voltage to the center tap of the secondary may be identical to the corresponding portion of a Foster-Seely discriminator. However, in the ratio detector, the two diodes are connected so that their load voltages are additive rather than subtractive.  3, fiche 8, Anglais, - ratio%20detector

Fiche 8,  Justifications,  Français

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Dans les récepteurs combinés modernes, les constructeurs introduisent, pour détecter les signaux de fréquence modulée, un discriminateur plus simple et plus économique que celui de phase : le discriminateur de rapport. Ce montage n'implique pas la présence d'un étage limiteur et permet une solution simple du problème de la commande automatique de sensibilité.  1, fiche 8, Français, - discriminateur%20de%20rapport

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Fiche 9,  Justifications,  Anglais

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Mouvements saisonniers.  1, fiche 9, Français, - rapport%20d%27amplitude

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Fiche 10,  Justifications,  Anglais

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horizontal-drive control. In an electromagnetically deflected television receiver, the control which adjusts the ratio of the pulse amplitude to the linear portion of the scanning-current wave.  3, fiche 10, Anglais, - horizontal%20drive

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Fiche 11,  Justifications,  Anglais

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A vibrograph which records curves of greater amplitude than the actual vibration, and with a specified ratio to them.  1, fiche 11, Anglais, - amplifying%20vibrograph

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Fiche 12,  Justifications,  Anglais

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Logarithm to base e of the ratio of the amplitude of successive oscillations which are diminishing through energy dissipation.  1, fiche 12, Anglais, - logarithmic%20decrement

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[...] logarithme népérien du rapport d'amplitude de deux élongations successives dans le même sens.  1, fiche 12, Français, - d%C3%A9cr%C3%A9ment%20logarithmique

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On utilise divers modes d'expression de l'amortissement, les plus courants sont : a) le décrément logarithmique [...] b) le taux de décroissance du son.  1, fiche 12, Français, - d%C3%A9cr%C3%A9ment%20logarithmique

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Fiche 13,  Justifications,  Anglais

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Relative amplitude of the periodic fluctuation of luminous intensity as measured by the ratio of the difference between the maximum and the minimum luminous intensity, to the maximum value...  1, fiche 13, Anglais, - amplitude%20of%20fluctuation%20of%20the%20luminous%20intensity

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amplitude of fluctuation of the luminous intensity of a source run on alternating current.  1, fiche 13, Anglais, - amplitude%20of%20fluctuation%20of%20the%20luminous%20intensity

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Amplitude relative de la fluctuation périodique de l'intensité lumineuse, mesurée par le rapport de la différence entre le maximum et le minimum de l'intensité lumineuse, à la valeur de ce maximum (...)  1, fiche 13, Français, - amplitude%20de%20fluctuation%20de%20l%27intensit%C3%A9%20lumineuse

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amplitude de fluctuation de l'intensité lumineuse d'une source alimentée par un courant alternatif (...)  1, fiche 13, Français, - amplitude%20de%20fluctuation%20de%20l%27intensit%C3%A9%20lumineuse

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Fiche 14,  Justifications,  Anglais

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The [DFM] meter indicates the distortion factor, which is the ratio of the rms total distortion to the amplitude of the fundamental frequency, including harmonics.  2, fiche 14, Anglais, - distortion%20factor

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A common measurement is total harmonic distortion (thd) where the fundamental of a very low distortion sine-wave test signal is removed by a steep notch filter. The summed harmonics that remain are then measured as a voltage of the fundamental at the required test power of the amplifier. (When measured in this manner the term thd is not really correct since the distortion also has the amplifier noise added to it within the test passband. The correct term is distortion factor). (GRAEL, 1977, p. 326).  3, fiche 14, Anglais, - distortion%20factor

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[Dans le Teac AS M50] les taux de distorsion restent très faibles quelle que soit la puissance, et (...) la décroissance des amplitudes dans l'analyse du spectre de distorsion par harmoniques est régulière.  1, fiche 14, Français, - taux%20de%20distorsion

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Fiche 15,  Justifications,  Anglais

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The Turam method [of electromagnetic exploration differs from the Sundberg method] in that the ratio of field intensities at two points is observed rather than the intensity at a single point. As with the Sundberg method, two frequencies within the 100-to 800-Hz range are employed. A cable several kilometers long is laid out as a source parallel to the expected strike and is grounded at both ends. Measuring coils are read in pairs along lines perpendicular to the cable, the spacing between them generally being about 25 m. In-phase and out-of-phase ratios are observed as well as amplitude ratios and phase-angle differences.  1, fiche 15, Anglais, - Turam%20method

Fiche 15,  Justifications,  Français

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[Méthode d'exploration géophysique électro-magnétique.] L'unité émettrice est similaire à celle (...) [de la méthode Sundberg] Le récepteur consiste en deux bobines mobiles de matière isolante, séparées l'une de l'autre par une distance fixe et autour desquelles on a enroulé un certain nombre de tours de fil. Ces deux bobines sont reliées entre elles par un système d'amplification, un point d'impédance et des écouteurs.  1, fiche 15, Français, - m%C3%A9thode%20Turam

Fiche 15,  Justifications,  Espagnol