Differential Mobility Spectrometer Temperature Gradient Control

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Solution Overview

Problem

Existing differential mobility spectrometers experience thermal instability and significant temperature gradients due to cooling effects from non-heated throttle gas, leading to detrimental variations in gas number density and ion separation performance, particularly when coupled with high-sensitivity mass spectrometers.

Innovation Solution

Implementing a heater system to control the temperature of the throttle gas flow, ensuring it matches the temperature of the transport gas at specific locations within the differential mobility spectrometer, thereby minimizing temperature gradients and maintaining consistent gas number density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If non-heated throttle gas is introduced to control gas flow rate, then gas flow rate control is achieved, but temperature gradient increases and thermal stability deteriorates

Engineering Contradiction:

Improvegas flow rate controlVSAvoidtemperature gradient

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The throttle gas is heated before being introduced into the DMS cell to preemptively counteract the cooling effect that would otherwise create temperature gradients. By performing the heating action in advance, the system maintains thermal stability while achieving flow rate control.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The temperature parameter of the throttle gas is changed from ambient to elevated (matching the DMS operating temperature) to eliminate the thermal mismatch between incoming gas and the existing DMS environment, thereby preventing temperature gradient formation.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If additional gas flows are introduced at the back of DMS cell to adjust resolution, then ion residence time is controlled, but thermal stability deteriorates due to cooling effect

Engineering Contradiction:

Improveion separation resolutionVSAvoidthermal stability

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The additional gas flows are pre-heated before introduction to counteract the cooling effect in advance, allowing resolution adjustment through flow rate control without compromising thermal stability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The temperature parameter of the additional gas flows is elevated to match DMS operating conditions, preventing thermal destabilization while enabling ion residence time control for resolution optimization.

Inventive Principle:

Principle #35Parameter changes

3Temperature

If gas number density varies due to temperature gradient, then thermal effects occur, but ion separation performance deteriorates

Engineering Contradiction:

Improvetemperature uniformityVSAvoidion separation performance

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

By maintaining uniform temperature through pre-heating throttle and additional gases, the gas number density remains constant along the DMS electrodes, ensuring homogeneous electric field conditions for optimal ion separation performance.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach stabilizes the temperature gradient, enhancing ion separation resolution and sensitivity by maintaining optimal electric field conditions, thus improving the performance of differential mobility spectrometers when coupled with mass spectrometers.

Implementation Method 1

a heater for controlling the temperature of gas flow from the gas port

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

A throttle gas may be introduced proximate the outlet of the differential mobility spectrometer for modifying the flow rate of the transport gas

Methodology Applied

Scientific EffectGas flow: Convection

Implementation Method 3

Differential Mobility Spectrometry (DMS), also referred to as high field-asymmetric waveform ion mobility spectrometry (FAIMS) or field ion spectrometry (FIS), separates and analyzes ions based on the field dependence of ion mobility

Methodology Applied

Scientific EffectIon mobility separation: Electrophoresis

Data Source

PatentUS12498351B2Systems and methods for controlling temperature gradient along a differential mobility spectrometer

Publication Date: 2025.12.16 DH TECH DEVMENT PTE

AI summary

A system and method are provided for controlling the temperature gradient along a differential mobility spectrometer having a differential mobility spectrometer having an inlet and an outlet, wherein the inlet is configured to receive ions transported from an ion source by a transport gas. The differential mobility spectrometer has an internal operating pressure, electrodes, and at least one voltage source for providing DC and RF voltages to the electrodes for separating ions that are transported from the inlet to the outlet. A gas port is provided near the outlet for introducing a throttle gas to control the flow rate of the transport gas through the differential mobility spectrometer and thereby adjust the ion residence time. A heater is provided for controlling the temperature of the throttle gas to minimize the temperature gradient between the inlet and outlet of the differential mobility spectrometer. A method of calibrating a DMS is also disclosed.