Charge sensor and spectrometers incorporating it

H - Electricity – 01 – J

Patent

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Details

IPC codes

H01J 49/02 (2006.01) G01T 1/28 (2006.01) G01T 1/29 (2006.01)

Type

Patent

Patent number

CA 2062946

Description

The invention is a sensor for electrical charge fabricated as an integrated circuit and comprising an electrode (1) for receiving charge, a potential-sensitive switching means (2) for generating a pulse whenever the charge received on the electrode (1) is sufficiently great, a counting means (4) for counting the number of times the switching means operates, and a means (3) for restoring the potential on the electrode (1) to its initial potential each time the switching means (3) operates and/or continuously towards its initial potential An integrated circuit comprising an array of such sensors and digital logic for controlling their operation is disclosed. The array may be used as a multiple-channel detector for charged particles, particularly as a detector for electrons emerging from a channel plate electron multiplier. Dispersive particle and photon spectrometers, especially mass spectrometers, using such a detector are also disclosed.

L'invention est un capteur de charges électriques fabriqué sous la forme d'un circuit intégré qui comprend une électrode (1) servant à recevoir les charges, un dispositif de commutation sensible au potentiel (2) servant à produire une impulsion quand la charge reçue sur l'électrode (1) est suffisamment grande, un dispositif de comptage (4) servant à compter le nombre de fois que le dispositif de commutation est actionné, et un dispositif (3) servant à rétablir le potentiel de l'électrode (1) à sa valeur initiale chaque fois que le dispositif de commutation (3) est actionné, ou à le ramener graduellement à sa valeur initiale. Un circuit intégré comportant un réseau de tels capteurs et un circuit logique servant à commander leur fonctionnement est divulgué. Ce réseau peut être utilisé comme détecteur de particules chargées multicanal, particulièrement comme détecteur d'électrons émergeant d'un multiplicateur d'électrons à plaques. Des spectromètres à particules et à photons à dispersion, particulièrement des spectromètres de masse, qui utilisent ce détecteur sont également divulgués.

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