Thermally Stable Collection Device for Trace Substance Detection

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Solution Overview

Problem

Conventional trace detection systems face challenges in detecting substances with low volatilities, such as narcotics and explosives, due to the thermal decomposition of sample swabs at high temperatures and the need for a flexible collection device that can withstand high desorption temperatures without cracking.

Innovation Solution

A thermally stable collection device comprising an inert fiber material, such as fiberglass, coated with a siloxane resin that maintains flexibility and can withstand temperatures up to 450°C, allowing for efficient sample collection and desorption of substances like explosives and narcotics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional sample swabs are used for collection, then the device is flexible and easy to operate, but the swabs undergo thermal decomposition at high temperatures (up to 450°C) required for volatilizing low volatility substances

Engineering Contradiction:

Improvethermal stabilityVSAvoidthermal decomposition

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The collection device uses a composite structure combining an inert fiber material (providing thermal stability) with a siloxane resin coating (providing flexibility and sample collection capability). This composite approach allows the device to withstand high temperatures up to 450°C while maintaining the flexibility needed for effective sample collection, resolving the contradiction between thermal stability and operational flexibility.

Inventive Principle:

Principle #40Composite materials

2Temperature

If the collection device is made rigid to withstand high temperatures, then thermal stability is improved, but the device loses flexibility needed for effective sample collection

Engineering Contradiction:

Improvethermal stabilityVSAvoidflexibility

Core Design Contradiction:

TemperatureVSEase of operation

Solution Approach 1:

The device combines rigid inert fiber material for thermal stability with a flexible siloxane resin coating for ease of operation. The coating layer provides the necessary flexibility for bending and conforming to surfaces during sample collection, while the underlying fiber structure maintains rigidity and thermal stability at high temperatures.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

A thin film of siloxane resin is applied as a coating on the inert fiber material. This thin flexible film allows the device to bend and conform to surfaces for effective sample collection, while the underlying rigid fiber structure provides the necessary thermal stability. The thin film architecture maintains flexibility without compromising the thermal properties of the base material.

Inventive Principle:

Principle #30Flexible shells and thin films

3Measurement precision

If high desorption temperatures (up to 450°C) are used to volatilize low volatility substances, then detection sensitivity is improved, but conventional swabs decompose at these temperatures

Engineering Contradiction:

Improvedetection sensitivityVSAvoidthermal decomposition

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The collection device is designed as a disposable component that can withstand the harsh high-temperature desorption conditions (up to 450°C) without decomposing. By using inert fiber material and heat-stable siloxane resin, the device maintains its structural integrity during high-temperature volatilization of low volatility substances, enabling sensitive detection while avoiding the thermal decomposition issues that plague conventional reusable swabs.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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

The described system effectively collects and releases substances of interest at high temperatures, enhancing detection capabilities by maintaining thermal stability and flexibility, thereby improving detection responses compared to conventional sample swabs.

Implementation Method 1

The collection device may be thermally stable up to a temperature of about 450° C.

Methodology Applied

Scientific EffectThermal stability:

Implementation Method 2

heating the collection device to release the substance of interest

Methodology Applied

Scientific EffectVolatilization: Evaporation

Data Source

PatentUS11235329B2Systems and methods for substance detection using thermally stable collection devices

Publication Date: 2022.02.01 RAPISCAN SYST INC (US)

AI summary

The present disclosure is directed to methods and systems for detecting a substance of interest. The methods and systems include collecting the substance of interest on a collection device comprising an inert fiber material and a siloxane resin. The systems and methods further include heating the collection device in a desorber, wherein heating the device releases the substance of interest from the device, performing an analysis of the substance of interest, and detecting the substance of interest.