IP Library › Granted Patent US 12,699,072
Granted Patent B2
US 12,699,072 · App. 18/262,972 · Granted Aug 4, 2026

Dynamic heating of a differential mobility spectrometer cell

Inventors: John L. Campbell (Milton, CA); Bradley B. Schneider (Concord, CA); Thomas R. Covey (Newmarket, CA)
Assignee: DH Technologies Development Pte. Ltd.
G01N27/624G01N27/623H01J49/0031H01J49/165
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Quick Facts
Patent No.
US 12,699,072
App. No.
18/262,972
Filed
Jul 26, 2023
Granted
Aug 4, 2026
Kind
B2
Art Unit
2881
USPC
250/282
Abstract

A method of operating a differential mobility spectrometer (DMS) includes providing a heater disposed proximate a ceramic body of a DMS cell. A first control voltage is applied to the heater. A first threshold is detected by a first sensor disposed within a curtain plate that substantially surrounds the DMS cell. A second control voltage is applied to the heater based at least in part on the detected first threshold. During application of the second control voltage, a mass spectrometry analysis of a gas within the DMS cell is performed.

Claims (14)

1 . A method of operating a differential mobility spectrometer (DMS), the method comprising:

providing a heater disposed proximate a ceramic body of a DMS cell;

applying a first control voltage to the heater;

detecting a first threshold with a first sensor disposed within a curtain plate, wherein the curtain plate substantially surrounds the DMS cell;

applying a second control voltage to the heater based at least in part on the detected first threshold;

during application of the second control voltage, performing a mass spectrometry analysis of a gas within the DMS cell.

2 . The method of claim 1 , wherein the sensor comprises a temperature sensor, and wherein the first threshold is a temperature.

3 . The method of claim 2 , wherein the temperature sensor is disposed remote from the heater.

4 . The method of claim 2 , wherein the temperature sensor is disposed on the ceramic body.

5 . The method of claim 2 , wherein the temperature sensor is disposed proximate an inlet to a vacuum chamber adjacent the ceramic body.

6 . The method of claim 1 , where in the sensor comprises a pressure sensor, and wherein the first threshold is a pressure.

7 . The method of claim 6 , wherein the pressure sensor is disposed in an orifice plate adjacent a vacuum chamber coupled to the DMS cell.

8 . The method of claim 1 , wherein the first control voltage is a constant voltage.

9 . The method of claim 1 , wherein the second control voltage is less than the first control voltage.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 26, 2023
From: CAMPBELL, JOHN L.; SCHNEIDER, BRADLEY B.; COVEY, THOMAS R.
To: DH TECHNOLOGIES DEVELOPMENT PTE. LTD.
Reel/Frame 064387/0747 →
Continuity (2)
Provisional Application 63152918 · Feb 24, 2021
Related Publication 20240085373A1 · Mar 14, 2024
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