Differential Mobility Spectrometer Throttle Gas Heating for Thermal Stability

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Solution Overview

Problem

Existing differential mobility spectrometers experience thermal instability and temperature gradients due to cooling effects from non-heated throttle gas, leading to ion mobility shifts and reduced resolution in coupled mass spectrometers.

Innovation Solution

Implementing a heater system to control the temperature of 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 stabilizing ion mobility.

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 and thermal instability occur

Engineering Contradiction:

Improvegas flow rate controlVSAvoidtemperature gradient

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The patent applies parameter changes by heating the throttle gas to match the temperature of the transport gas. This changes the thermal parameter of the throttle gas from ambient temperature to elevated temperature, eliminating the temperature gradient that causes thermal instability while maintaining the flow rate control function.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a heater as an intermediary device between the throttle gas source and the DMS cell. This heater acts as a mediator that thermalizes the throttle gas before it enters the system, allowing flow rate control without introducing thermal disturbances to the ion mobility separation process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If additional gas flows are introduced at the back of the DMS cell, then adjustable resolution is achieved, but thermal instability occurs due to cooling

Engineering Contradiction:

ImproveresolutionVSAvoidthermal stability

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The patent changes the thermal parameter of the additional gas flows by heating them to match the transport gas temperature. This allows the gas flows to be used for resolving power adjustment through residence time control without introducing cooling effects that would destabilize the thermal environment and cause ion mobility shifts.

Inventive Principle:

Principle #35Parameter changes

3Temperature

If gas number density varies along the length of DMS electrodes, then temperature gradient is present, but ion separation performance deteriorates

Engineering Contradiction:

Improvegas number density uniformityVSAvoidion separation performance

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent applies equipotentiality by ensuring the throttle gas temperature equals the transport gas temperature throughout the system. This creates a thermally uniform environment where gas number density remains constant along the electrode length, maintaining the homogeneous electric field conditions necessary for optimal ion separation performance.

Inventive Principle:

Principle #12Equipotentiality

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

Stabilizes ion mobility and maintains optimal resolution by eliminating thermal gradients, enhancing the performance and sensitivity of differential mobility spectrometers 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

controlling the temperature of the throttle gas to minimize temperature gradient between the inlet and outlet of the differential mobility spectrometer

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20260079129A1Systems and Methods for Controlling Temperature Gradient Along a Differential Mobility Spectrometer

Publication Date: 2026.03.19 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.