Inductive Desorber Sample Carrier for Rapid 700°C Desorption
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Solution Overview
Problem
Ion mobility spectrometers face challenges in efficiently desorbing medium- and low-volatility substances at high temperatures due to the need for thermal insulation, slow heating, and energy inefficiency, which limits their operational readiness and duration, especially in mobile applications with limited energy capacity.
Innovation Solution
A desorber with an inductive heating system using a highly permeable, electrically conductive sample carrier with a low heat capacity, allowing for rapid temperature control and efficient heating of substances up to 700°C, achieved through a coil and coil carrier design that minimizes heat loss and enables controlled temperature profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal insulation is implemented to generate high temperatures for desorption, then desorption temperature is improved, but heating time and energy consumption increase
Solution Approach 1:
The patent replaces conventional resistive heating elements with inductive heating technology. The induction unit generates a time-varying magnetic field that directly induces eddy currents in the sample carrier, converting electromagnetic energy directly into heat within the sample carrier itself. This eliminates the need for thermal conduction through heater elements and insulation layers, dramatically reducing heating time while maintaining high desorption temperatures.
Solution Approach 2:
The sample carrier is designed with high magnetic permeability and electrical conductivity to serve dual functions: it both holds the sample and acts as the heating element itself. The time-varying magnetic field induces currents directly in the sample carrier, making the sample carrier self-heating. This eliminates the need for separate heating elements and reduces thermal mass, enabling rapid temperature changes.
2Temperature
If thermal insulation is implemented to generate high temperatures for desorption, then desorption temperature is improved, but energy consumption increases
Solution Approach 1:
The patent replaces conventional resistive heating with inductive heating, where electromagnetic energy directly induces currents in the sample carrier. This method is more energy-efficient because heat is generated directly in the sample carrier rather than being transferred through heater elements and insulation, minimizing thermal losses and reducing overall energy consumption while achieving high desorption temperatures.
Solution Approach 2:
The patent utilizes the electrical conductivity and magnetic permeability of the sample carrier material, which would normally be considered properties for sample interaction, to also serve as the heating mechanism. The same material properties that enable sample desorption also enable efficient energy transfer from the magnetic field to thermal energy in the sample carrier, converting what could be seen as a limitation into a beneficial self-heating mechanism.
3Reliability
If high temperature desorption is implemented, then detection capability for medium- and low-volatility substances is improved, but operational readiness time increases
Solution Approach 1:
The patent replaces conventional thermal heating systems with inductive heating, enabling rapid temperature changes. The induction unit can quickly heat the sample carrier to high temperatures for desorption and just as quickly cool it down afterward, dramatically reducing the time between measurements and improving operational readiness while maintaining high detection capability for medium- and low-volatility substances.
Solution Approach 2:
The patent implements dynamic temperature control through inductive heating, allowing the system to rapidly adjust temperature according to measurement requirements. The sample carrier can be quickly heated to optimal desorption temperatures and then rapidly cooled for the next measurement, enabling flexible and responsive operation that improves both detection capability and readiness time.
4Temperature
If conventional heating elements are used, then heating function is achieved, but heat loss increases due to large heating surface area
Solution Approach 1:
The patent replaces contact-based resistive heating with contactless inductive heating. The time-varying magnetic field penetrates the sample carrier and induces eddy currents directly within it, generating heat internally without requiring a large heating surface area. This eliminates the fundamental problem of heat loss through large heater surfaces, as heat is generated where needed rather than being transferred from a separate heating element.
Solution Approach 2:
The patent extracts the heating function from a separate heating element and integrates it directly into the sample carrier through inductive heating. The sample carrier itself becomes the heating element, eliminating the need for separate heaters and their associated surface area losses. Only the minimal surface area of the sample carrier is heated, dramatically reducing heat loss to the environment.
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
Enables rapid and efficient desorption of substances with high energy efficiency, allowing for the detection of substances like salts used in explosives and hazardous materials, while reducing the need for preheating and minimizing heat loss, thus improving the operational readiness and duration of ion mobility spectrometers.
Implementation Method 1
an induction unit (2) arranged in the housing, wherein the induction unit (2) has a highly permeable and electrically poor conductor coil carrier (21) with a coil (22), and a highly permeable sample carrier (23) which can be removed via the closable opening and is designed as an inductive heating element for heating a substance to be desorbed
Implementation Method 2
The coil carrier (21) and the coil (22) are separated from the sample carrier (23) by a gap (24). The sample carrier (23) is arranged such that a magnetic flux, generated by an alternating current flowing in the coil (22), flows through the coil carrier (21) and the gap (24) through the sample carrier (23)
Implementation Method 3
The sample carrier (23) is arranged such that a magnetic flux, generated by an alternating current flowing in the coil (22), flows through the coil carrier (21) and the gap (24) through the sample carrier (23)
Implementation Method 4
The desorbed sample enters the ion mobility spectrometer via a carrier gas stream
Data Source
Figure 1~2
Figure 3~9
Figure 4~6
AI summary
The invention relates to a desorber for a spectrometer, in particular for an ion mobility spectrometer, comprising a housing with inlet and outlet lines for a sample carrier gas and a closable opening, and an induction unit arranged in the housing. The induction unit comprises a highly permeable and electrically poorly conductive, preferably electrically insulating, coil carrier. A coil is arranged in the coil carrier. The induction unit further comprises a highly permeable sample carrier that can be removed via the closable opening, wherein the sample carrier is designed as an inductive heating element to heat a substance to be desorbed and applied to the sample carrier. The coil carrier and the coil are spaced apart from the sample carrier by a gap.The sample carrier is arranged such that a magnetic flux, generated by an alternating current flowing in the coil, flows through the coil support and the gap, and then through the sample carrier. The removable sample carrier serves to receive and transfer the substances to be detected into the interior of the desorber.