公开(公告)号：CA2783356A1

公开(公告)日：2013-01-15

申请号：CA2783356

申请日：2012-07-11

Applicant: BRUKER DALTONICS INC

Inventor： STEINER URS ,  MOELLER ROY P ,  DEFORD DAVID

IPC: H01J3/36 ,  H01J49/02

Abstract: Methods and systems to compensate for distortions created by dynamic voltage applied to an electron multiplier used in mass spectrometry. An electron multiplier has a cathode end accepting ion flow, an opposite emitter end and an interior surface. The electron multiplier produces an electron output from ions colliding with the interior surface. A variable power supply has a voltage output coupled to the cathode end and the emitter end of the electron multiplier. The voltage output changes dynamically to adjust the electron output from the electron multiplier. An anode is located in proximity to the electron multiplier. An electrometer is coupled to the anode in proximity to the electron multiplier to measure the current generated by the electron output. A low pass filter circuit is coupled to the emitter end to the ground of the electrometer to attenuate emitter voltage changes. A bias circuit is coupled to the emitter end to stabilize emitter to anode voltage difference.

公开(公告)号：CA2783356C

公开(公告)日：2016-05-10

申请号：CA2783356

申请日：2012-07-11

Applicant: BRUKER DALTONICS INC

Inventor： STEINER URS ,  MOELLER ROY P ,  DEFORD DAVID

IPC: H01J3/36 ,  H01J49/02

Abstract: Methods and systems to compensate for distortions created by dynamic voltage applied to an electron multiplier used in mass spectrometry. An electron multiplier has a cathode end accepting ion flow, an opposite emitter end and an interior surface. The electron multiplier produces an electron output from ions colliding with the interior surface. A variable power supply has a voltage output coupled to the cathode end and the emitter end of the electron multiplier. The voltage output changes dynamically to adjust the electron output from the electron multiplier. An anode is located in proximity to the electron multiplier. An electrometer is coupled to the anode in proximity to the electron multiplier to measure the current generated by the electron output. A low pass filter circuit is coupled to the emitter end to the ground of the electrometer to attenuate emitter voltage changes. A bias circuit is coupled to the emitter end to stabilize emitter to anode voltage difference.

公开(公告)号：DE102012211598A1

公开(公告)日：2013-01-17

申请号：DE102012211598

申请日：2012-07-04

Applicant: BRUKER DALTONICS INC

Inventor： STEINER URS ,  MOELLER ROY P ,  DEFORD DAVID

IPC: H01J43/30 ,  H01J49/02 ,  H01J49/26

Abstract: Die Anmeldung betrifft Verfahren und Systeme zum Ausgleichen von Verzerrungen, die durch das Anlegen einer dynamischen Spannung an einen in der Massenspektrometrie verwendeten Elektronenvervielfacher entstehen. Ein Elektronenvervielfacher hat ein Kathodenende, an dem ein Ionenstrom eintritt, ein gegenüberliegendes Emitterende und eine Innenfläche. Der Elektronenvervielfacher gibt Elektronen aus, die durch Kollision von Ionen mit der Innenfläche erzeugt werden. Eine regelbare Spannungsversorgung hat einen Spannungsausgang, der mit dem Kathodenende und dem Emitterende des Elektronenvervielfachers verbunden ist. Die Ausgangsspannung wird dynamisch geändert, um die Elektronenausgabe des Elektronenvervielfachers einzustellen. Eine Anode ist in der Nähe des Elektronenvervielfachers angeordnet. Ein Elektrometer, das an die Anode in der Nähe des Elektronenvervielfachers angeschlossen ist, misst den durch die Elektronenausgabe generierten Strom. Eine Tiefpassfilterschaltung ist mit dem Emitterende und der Masse des Elektrometers verbunden, um Spannungsänderungen des Emitters abzuschwächen. Eine mit dem Emitterende verbundene Vorspannungsschaltung stabilisiert den Emitter bei Abweichungen der Anodenspannung.

公开(公告)号：GB2493604A

公开(公告)日：2013-02-13

申请号：GB201212353

申请日：2012-07-11

Applicant: BRUKER DALTONICS INC

Inventor： STEINER URS ,  MOELLER ROY P ,  DEFORD DAVID

IPC: H01J43/30 ,  H01J49/02

Abstract: The invention relates to methods and systems to compensate for distortions created by dynamic voltage applied to an electron multiplier used in the ion detector of a mass spectrometer. An electron multiplier has a cathode end 122 accepting ion flow, an opposite emitter end 124 and an interior surface. The electron multiplier produces an electron output from ions colliding with the interior surface. A variable power supply 308 has a voltage output coupled to the cathode end and the emitter end of the electron multiplier which changes dynamically to adjust the electron output from the electron multiplier. An electrome­ter 306 is coupled to an anode 126 to measure the current gener­ated by the electron output. A low pass filter circuit 302 is coupled between the emitter 124 and a common ground of the electrometer 306 to attenuate emitter voltage changes. A bias circuit 304 including a Zener diode 320 is coupled to the emitter end to stabilize emitter to anode voltage difference.