Patents Assigned to ISOTOPX LTD
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Patent number: 11764026Abstract: An electron source in a gas-source mass spectrometer the electron source comprising: an electron emitter cathode presenting a thermionic electron emitter surface in communication with a gas-source chamber of the gas-source mass spectrometer for providing electrons there to; a heater element electrically isolated from the electron emitter cathode and arranged to be heated by an electrical current therein and to radiate heat to the electron emitter cathode sufficient to liberate electrons thermionically from said electron emitter surface, therewith to provide a source of electrons for use in ionising a gas the gas-source chamber.Type: GrantFiled: July 20, 2022Date of Patent: September 19, 2023Assignee: ISOTOPX LTD.Inventors: Damian Paul Tootell, Anthony Michael Jones
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Patent number: 11756776Abstract: A capacitive trans-impedance amplifier comprising a voltage amplifier having an inverting input terminal for connection to an input current source. A feed-back capacitor is coupled between the inverting input terminal and the output terminal to accumulate charges received from the input current source and to generate a feed-back voltage accordingly. A calibration unit includes a calibration capacitor electrically coupled, via a calibration switch, to the inverting input terminal and electrically coupled to the feed-back capacitor. The calibration unit is operable to switch the calibration switch to a calibration state permitting a discharge of a quantity of charge from the calibration capacitor to the feed-back capacitor.Type: GrantFiled: December 16, 2021Date of Patent: September 12, 2023Assignee: ISOTOPX LTDInventors: Vadim Volkovoy, Anthony Michael Jones, Damian Paul Tootell
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Patent number: 11430627Abstract: An electron source in a gas-source mass spectrometer the electron source comprising: an electron emitter cathode presenting a thermionic electron emitter surface in communication with a gas-source chamber of the gas-source mass spectrometer for providing electrons there to; a heater element electrically isolated from the electron emitter cathode and arranged to be heated by an electrical current therein and to radiate heat to the electron emitter cathode sufficient to liberate electrons thermionically from said electron emitter surface, therewith to provide a source of electrons for use in ionising a gas the gas-source chamber.Type: GrantFiled: October 26, 2018Date of Patent: August 30, 2022Assignee: ISOTOPX LTD.Inventors: Damian Paul Tootell, Anthony Michael Jones
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Patent number: 11355332Abstract: The use of a capacitor (22) to serve as the principal impedance in a negative feed-back loop in a voltage amplifier component (21) of a trans-impedance amplifier and actively controlling the amount of charge accumulated within the capacitor appropriately to improve the responsiveness and/or dynamic range of the amplifier. A switch (25) is electrically coupled to the inverting input terminal of the voltage amplifier and electrically isolated from the output terminal (23) of the voltage amplifier. The output voltage of the amplifier is proportional to the accumulation of charge, and the switch is operable to ‘reset’ the charge/voltage on the feedback capacitor, as desired. This arrangement decouples the structure of the switch from the output port of the voltage amplifier, and so avoids leakage currents and/or interfering voltage signals emanating from the switch structure and being felt at the output port of the voltage amplifier.Type: GrantFiled: November 10, 2017Date of Patent: June 7, 2022Assignee: ISOTOPX, LTDInventors: Anthony Michael Jones, Vadim Volkovoy, Damian Paul Tootell
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Patent number: 11232937Abstract: A capacitive trans-impedance amplifier comprising a voltage amplifier having an inverting input terminal for connection to an input current source. A feed-back capacitor is coupled between the inverting input terminal and the output terminal to accumulate charges received from the input current source and to generate a feed-back voltage accordingly. A calibration unit includes a calibration capacitor electrically coupled, via a calibration switch, to the inverting input terminal and electrically coupled to the feed-back capacitor. The calibration unit is operable to switch the calibration switch to a calibration state permitting a discharge of a quantity of charge from the calibration capacitor to the feed-back capacitor.Type: GrantFiled: November 10, 2017Date of Patent: January 25, 2022Assignee: ISOTOPX LTDInventors: Vadim Volkovoy, Anthony Michael Jones, Damian Paul Tootell