US 12,247,947 B2
Systems and methods for effective gap filtering and atmospheric pressure RF heating of ions
Bradley B. Schneider, Bradford (CA); Erkinjon Nazarov, Tampa, FL (US); and Thomas R. Covey, Richmond Hill (CA)
Assigned to DH Technologies Development Pte. Ltd., Singapore (SG)
Filed by DH TECHNOLOGIES DEVELOPMENT PTE. LTD., Singapore (SG)
Filed on May 20, 2021, as Appl. No. 17/325,483.
Application 17/325,483 is a continuation of application No. 16/088,103, granted, now 11,067,538, previously published as PCT/IB2017/051613, filed on Mar. 21, 2017.
Claims priority of provisional application 62/317,538, filed on Apr. 2, 2016.
Prior Publication US 2021/0270774 A1, Sep. 2, 2021
Int. Cl. G01N 27/624 (2021.01); H01J 49/00 (2006.01); H01J 49/16 (2006.01)
CPC G01N 27/624 (2013.01) [H01J 49/0045 (2013.01); H01J 49/168 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A FAIMS device, comprising:
a first electrode;
a second electrode placed relative to the first electrode to provide a continuous and constant gap distance, d, between the first electrode and the second electrode from an inlet of the device to an outlet of the device;
a switching circuit configurable to switch the device between a high-field asymmetric-waveform apparatus for differential ion mobility spectrometry and a high-field symmetric-waveform apparatus; and,
wherein the constant gap between the first electrode and the second electrode is at atmospheric pressure or at a positive pressure.
 
12. A method for transmitting, fragmenting, or separating ions using a FAIMS device, comprising:
providing a first electrode and a second electrode,
positioning the first electrode and the second electrode to provide a continuous and constant gap distance, d, between the first electrode and the second electrode from an inlet of the device to an outlet of the device, through which ions flow;
selectively applying a first waveform and a second waveform to at least one of the first electrode and/or the second electrode;
switching between transmitting, fragmenting, or separating ions by configuring the first waveform and the second waveform to produce either a symmetric electric field or an asymmetric electric field in the gap between the first electrode and the second electrode,
wherein the symmetric electric field and the asymmetric electric field both comprise a high-field; and,
wherein the continuous and constant gap between the first electrode and the second electrode is at atmospheric pressure or at a positive pressure.