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A detector whose output voltage is proportional to the amplitude of an unmodulated carrier applied to its input.  2, fiche 1, Anglais, - linear%20detector

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linear detector: term officially approved by the Lexicon Project Committee (New Brunswick).  3, fiche 1, Anglais, - linear%20detector

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Détecteur dont la tension de sortie est proportionnelle à l'amplitude d'une porteuse non modulée appliquée à l'entrée.  2, fiche 1, Français, - d%C3%A9tecteur%20lin%C3%A9aire

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détecteur linéaire : terme uniformisé par le Comité du projet de lexiques (Nouveau-Brunswick).  3, fiche 1, Français, - d%C3%A9tecteur%20lin%C3%A9aire

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A detector that delivers an output voltage that is some fraction of the peak value of the regularly repeated pulses applied to it.  2, fiche 2, Anglais, - quasi%2Dpeak%20detector

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The fraction increases toward unity as the pulse repetition rate increases.  2, fiche 2, Anglais, - quasi%2Dpeak%20detector

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quasi-peak detector: term standardized by IEC [International Electrotechnical Commission].  3, fiche 2, Anglais, - quasi%2Dpeak%20detector

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détecteur de quasi-crête : terme normalisé par la CEI [Commission électrotechnique internationale]  2, fiche 2, Français, - d%C3%A9tecteur%20de%20quasi%2Dcr%C3%AAte

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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

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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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A Geiger-Mueller(GM) tube is a gas-filled radiation detector. It commonly takes the form of a cylindrical outer shell(cathode) and the sealed gas-filled space with a thin central wire(the anode) held at [approximately] 1 kV [kilovolt] positive voltage with respect to the cathode. The fill gas is generally argon at a pressure of less than 0. 1 atm [atmosphere] plus a small quantity of a quenching vapor …  1, fiche 4, Anglais, - fill%20gas

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[Détection et mesures des rayonnements nucléaires.] Gaz de remplissage : son choix est important puisque le développement de l’avalanche dépend largement de la dérive des électrons primaires. Toute trace d’oxygène doit être proscrite et on utilise le plus souvent un gaz rare (comme Ar [argon] ou Kr [krypton] ou Xe [xénon]) pour augmenter l’efficacité s’il s’agit de détecter des photons. Pour la détection des neutrons, on utilise d’autres gaz moins classiques. Ce gaz est souvent enfermé dans une enceinte scellée (emploi plus commode) ou peut être recyclé en permanence dans le compteur (dans la détection des particules chargées en particulier).  1, fiche 4, Français, - gaz%20de%20remplissage

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Detector response can be described in two ways. The detector response can be defined as the voltage output for unit change in solute concentration flowing through the detector sensor, or, for a mass sensitive detector, the voltage output for unit change in solute mass passing through the detector.  1, fiche 5, Anglais, - detector%20response

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Données de dosimétrie. Ce sont des indicateurs - appelés réponses de détecteur - sensibles au flux de particules qui renseignent sur la nature et le niveau d'une irradiation. À côté des débits de dose et des radiotoxicités (cf. normes CIPR) qui permettent d'évaluer le risque encouru par un être vivant, on peut citer des sections efficaces particulières utiles à l'étude de la tenue des matériaux sous irradiation [...]  1, fiche 5, Français, - r%C3%A9ponse%20de%20d%C3%A9tecteur

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A radiation detector using a semiconductor, in which free electric changes are produced along the path of an ionizing particle, in combination with a high voltage and electrodes to collect the induced electric changes.  1, fiche 6, Anglais, - semiconductor%20detector

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[...] détecteur de rayonnement qui utilise un semi-conducteur dans lequel il y a production de charges électriques libres dans le chemin d'une particule ionisée.  2, fiche 6, Français, - d%C3%A9tecteur%20%C3%A0%20semi%2Dconducteur

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A detector whose output voltage is proportional to the square of the amplitude of an unmodulated carrier applied to its input.  1, fiche 7, Anglais, - square%20law%20detector

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Détecteur dont la tension de sortie est proportionnelle au carré de l'amplitude d'une porteuse non modulée appliquée à l'entrée.  2, fiche 7, Français, - d%C3%A9tecteur%20quadratique

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The main units of the AIC are : the focal plane assembly(FPA), equipped with a back-thinned illuminated CCD matrix and a front-end amplifier, provides the optical signal detection. A thermoelectric peltier cooler under the detector sets the operating point at-25°C ± 100 mK, the detection box(BD) which supplies the FPA with the necessary electrical signals to operate the CCD. It generates the clock waveforms from the VEU signals and filters the supplied voltage from the DSU, the video electronics unit(VEU) which processes the analog signal coming from the FPA, digitizes it on 12 bits before passing it on in serial processing to the science data processing subsystem(SDPSS). It also provides the DBs with the primary clock signal. The power conditioning of the VEU is located in the same unit, the detection supply unit(DSU) delivers relevant stabilized voltages to the 5 DUs and power to thermo-coolers from the main supply feeder of the instrument.  2, fiche 8, Anglais, - analog%20imaging%20chain

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Converter sub-assembly.  1, fiche 8, Anglais, - analog%20imaging%20chain

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The LMS33460 is an under voltage detector with a 3. 0V threshold and extremely low power consumption. [It] is specifically designed to accurately monitor power supplies. It is especially suited to battery powered systems where low quiescent current and small size are required.  2, fiche 9, Anglais, - under%2Dvoltage%20detector

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An IR [infrared] detector where temperature changes of a junction of dissimilar metals because of changes in the level of incident radiation causes a change in voltage.  2, fiche 10, Anglais, - thermovoltaic%20detector

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In the thermovoltaic detector(for example the thermocouple), a temperature fluctuation of a junction of dissimilar metals results in a generated voltage.  3, fiche 10, Anglais, - thermovoltaic%20detector

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The typical particle counter for metering the amount of particulate matter in clean work station air is an optical assembly. Air is drawn into and through the optical subassembly of the particle counter until a pre-set volume of air has been seen. The particles which are drawn into this optical subassembly cause a pulse of light to be scattered for each particle present. The light pulse is sensed by a detector which converts the pulse to an electrical voltage signal. Each signal is cumulatively counted, for the pre-set volume of air. From the amplitude of the voltage, the size of each particle can be determined. All particle counters consist of three basic subassemblies. These are the optical subassembly which "sees" the particles, a pump subassembly which draws the air stream into and through the optical subassembly, and an electronic subassembly for converting each particle size/unit number to an electrical signal. Also available, usually as an option, is some form of printer.  1, fiche 11, Anglais, - particle%20counter

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A readout device in which a pen, whose deflection is proportional to the voltage output of the chromatographic detector, writes on a paper chart which is moving at a constant speed.  2, fiche 12, Anglais, - potentiometric%20recorder

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In 1956, Harley and Pretorius described a simple discharge detector for gas chromatography based on the electrical properties of a glow discharge, the voltage across the gaseous discharge being a function of the type of gas present. Druyvesteyn and Penning in 1940 reviewed the complex nature of the glow discharge, noting that the discharge is maintained by electrons emitted from the cathode which result from processes related to positive ion bombardment, photoelectric emission, and collisions with excited atoms. When trace quantities of a material eluted from a chromatographic column enter the detector(consisting of a small platinum disk cathode and a tungsten wire anode), a voltage change resulted which was recorded.  2, fiche 13, Anglais, - glow%20discharge%20detector

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Using neon lamps Pitkethly found... that these detector were current and pressure independent at 1-1. 5 mS and 3-5 mm Hg.... In 1958, Roberts and Hinkle evaluated glow discharge tubes as detectors for compounds in the concentration range of 5-500 ppm and concluded that the detector was not applicable to general-purpose use.... More recently, Wilhite described glow discharge-type devices which act electrically similar to a gas-filled voltage-regulator tube... Riley described the use of an argon purity meter, a glow-type discharge detector, for the determination of small concentrations(0-1500 ppm) of impurity gases in argon.  2, fiche 13, Anglais, - glow%20discharge%20detector

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As a means of exciting noble gases at atmospheric pressures, Lovelock developed a spark device of high sensitivity, capable of detecting as little as 10^{minus 13} mole of most organic materials. The detector consisted of a spark gap made of platinum wire sealed in a glass tube. The voltage across the 5-10 mm spark gap is measured with an electrostatic voltmeter. With pure argon subjected to an applied voltage of 2000 V to create sparks, the breakdown potential measured was logarithmically related to the concentration of vapor added to the argon.  2, fiche 14, Anglais, - gas%20discharge%20detector

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Karmen and Bowman developed a dc discharge detector based on a low-current electric discharge in argon or helium in the presence of a high-intensity electrostatic field ... Sternberg and Poilson developed a Tesla discharge detector ... Evrard, Thevelin, and Joossens described a nonradioactive, self-sustained discharge detector for the detection of permanent gases.  2, fiche 14, Anglais, - gas%20discharge%20detector

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Semiconductive Thin Film Detector. Using the known principle that the adsorption and desorption of gases cause a change in electrical conductivity of semiconductors, Seiyama et al. developed a new chromatographic detector for gaseous components.... The current, depending upon the resistance of the film, is converted to voltage by the variable resistance, which is fed without amplification to a recorder. Resistance also adjusts the input voltage of the recorder at desired sensitivity. Using zinc oxide as an example of a typical film material, the conductivity of its film maintains a fixed value when the nitrogen carrier gas is passed at a constant flow rate throught the borosilicate glass tube. When a small amount of another gas or vapor is added to the carrier gas, its conductivity is changed.  1, fiche 15, Anglais, - semiconductive%20thin%20film%20detector

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A simple arrangement of two cavities in series showed the feasibility of detecting traces of one gas in another. A klystron was used to generate microwave power which was fed through a wave guide to a transmission-type cavity. Another cavity was mounted in series with and tuned to the same frequency as the first; both cavities were identical except that the second had a gas inlet and outlet ports. From this measuring cell, its microwave energy was sent to a crystal detector. By frequency-modulating the klystron with a 50-cps sine wave voltage on the repeller, a burst of energy passes to the detector each time the generator frequency equals that of the cavities. The detector current is amplified and measured with an oscilloscope. At the beginning of the run, the two cavities are filled with the nitrogen carrier gas and, if the composition in one of the cavities is changed, its electrical size will change... causing a decrease of current from the detector.  1, fiche 16, Anglais, - crystal%20detector

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The detector elements operate in the voltage mode with a bias voltage applied to maintain and optimize the pyroelectric effect near thepara-electric-ferroelectric phase transition.  1, fiche 17, Anglais, - voltage%20mode

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Les éléments détecteurs fonctionnent sur le mode tension, avec application d'un prévoltage pour maintenir et optimiser l'effet pyroélectrique au voisinage de la transition de phase paraélectricité/ferroélectricité.  1, fiche 17, Français, - mode%20tension

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The detector elements operate in the voltage mode with a bias voltage applied to maintain and optimize the pyroelectric effect near the para-electric-ferroelectric phase transition.  1, fiche 18, Anglais, - para%2Delectric%2Dferroelectric%20phase%20transition

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Les éléments détecteurs fonctionnent sur le mode tension, avec application d'un prévoltage pour maintenir et optimiser l'effet pyroélectrique au voisinage de la transition de phase para-ferro/électrique.  1, fiche 18, Français, - transition%20de%20phase%20para%2Dferro%2F%C3%A9lectrique

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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 19, 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 19, Anglais, - ratio%20detector

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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 19, Français, - discriminateur%20de%20rapport

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