Symmetric DSC Sensor Assembly for Dual-Mode Heat Measurement

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Solution Overview

Problem

Existing differential scanning calorimeters lack the ability to operate in both heat flux and power compensation modes with improved measurement characteristics, limiting their versatility and accuracy.

Innovation Solution

A sensing unit for a differential scanning calorimeter featuring a disc-like substrate with symmetrical thermoelectric and electrical heater arrangements, allowing for operation in both modes, and incorporating multi-layered structures for enhanced heat detection and tolerance in pan placement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a differential scanning calorimeter uses a single sensor assembly design, then the structure is simple and easy to manufacture, but it cannot operate in both heat flux and power compensation modes with improved measurement characteristics

Engineering Contradiction:

Improveoperating modesVSAvoidsensor assembly structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The sensor assembly is designed with dual functionality to operate in both heat flux mode and power compensation mode. The same sensor assembly incorporates both thermoelectric arrangements for heat flux measurement and electrical heater arrangements for power compensation, allowing a single device to perform multiple measurement functions without requiring separate specialized assemblies for each mode.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines previously separate sensor components into a single integrated sensor assembly. The thermoelectric arrangements and electrical heater arrangements are merged into one unified structure mounted on a common substrate, enabling both heat flux and power compensation measurements to be performed simultaneously or alternatively using the same physical components.

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If the sensing unit uses a symmetrical thermoelectric and heater arrangement, then measurement accuracy and robustness are improved, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidsymmetrical arrangement precision

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

While the overall design aims for symmetry to improve measurement accuracy, the patent acknowledges that perfect symmetry is not required. The symmetrical arrangement of thermoelectric and heater elements provides robust measurements even with moderate manufacturing tolerances, as the differential measurement approach compensates for minor asymmetries in the physical layout.

Inventive Principle:

Principle #4Asymmetry

3Ease of operation

If the pan support region has larger extent, then tolerance in pan placement is improved, but the heat conduction path length increases reducing measurement response

Engineering Contradiction:

Improvepan placement toleranceVSAvoidheat detection response

Core Design Contradiction:

Ease of operationVSSpeed

Solution Approach 1:

The sensor assembly design allows the pan support region to have sufficient extent for tolerance compensation while maintaining localized thermoelectric and heater arrangements in optimal positions for heat detection. The differential configuration ensures that even if pan placement varies within acceptable tolerances, the measurement accuracy is maintained because both reference and sample sides experience similar geometric variations.

Inventive Principle:

Principle #3Local quality

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 sensing unit enables robust and repeatable measurements across a wide range of time resolutions, improving measurement accuracy and versatility by allowing operation in both heat flux and power compensation modes.

Implementation Method 1

a sample-side thermoelectric arrangement for generating between two terminal portions of the sample-side thermoelectric arrangement a sample-side electrical voltage signal, and a reference-side thermoelectric arrangement for generating between two terminal portions of the reference-side thermoelectric arrangement a reference-side electrical voltage signal

Methodology Applied

Scientific EffectSeebeck effect: Seebeck Effect

Implementation Method 2

a sample-side electrical heater arrangement beneath said sample-side pan support region and a reference-side electrical heater arrangement beneath said reference-side pan support region

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 3

the disc-like substrate is suitable for being mounted in heat conductive contact with a temperature-controlled heat source of said differential scanning calorimeter

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12596086B2Sensor assembly for a differential scanning calorimeter

Publication Date: 2026.04.07 METTLER TOLEDO GMBH

AI summary

A sensing unit for a differential scanning calorimeter includes a superposition of layers of a thermoelectric arrangement, a layer of an electrical heater arrangement and a layer of an absolute temperature measurement arrangement. The thermoelectric arrangements, the electrical heater arrangements and the absolute temperature measurement arrangements are symmetrically arranged on a sample-side and a reference-side of the sensor.