公开(公告)号：US20240128070A1

公开(公告)日：2024-04-18

申请号：US18380019

申请日：2023-10-13

Applicant: Kimia Analytics Inc. ,  Quadrocore Corp.

Inventor： Sina ALAVI ,  Gholamreza JAVAHERY ,  Dmitry VALYAEV ,  Victor TITOV

IPC: H01J49/00 ,  H01J49/02 ,  H01J49/06

CPC classification number: H01J49/0095 ,  H01J49/027 ,  H01J49/061

Abstract: The present invention is ion detection method for mass spectrometer. An electron multiplier is coupled with a conversion dynode for the detection of positive and negative ions. The aperture of the present system is ungrounded. As the ions (positive or negative) approach and go through the aperture, they induce an image current into the aperture plate which can be amplified and measured by a processing circuit. The magnitude of the image current is directly proportional to the number density, speed, charge, and polarity of ions flowing through the aperture. The measured image current is used as a means to switch between various detection modes. The measured current is calibrated and used as a reference to automatically switch between analog/counting modes, positive/negative ion detection, or various types of detectors implemented in the ion detection system.