Flux-Measuring Differential Calorimeter Reference Sample Mediator
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Solution Overview
Problem
Current calorimetry techniques face challenges in accurately measuring the thermal power of radioactive materials in large, inhomogeneously distributed samples due to size constraints and measurement errors, particularly for low-power and high-volume samples.
Innovation Solution
A flux-measuring differential calorimeter design that includes a fixed and mobile part forming an enclosure for the sample, with reference and measurement Peltier elements, and a regulated thermal block, allowing for precise measurement of heat fluxes regardless of sample location and size, up to several hundred liters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heat compensation principle is used to maintain constant temperature, then measurement speed is improved, but measurement precision deteriorates for large and weakly active samples
Solution Approach 1:
The patent introduces a reference sample as an intermediary element that experiences the same thermal environment as the measured sample. By measuring the temperature difference between the reference sample and the measured sample, the system eliminates the need for direct temperature regulation while compensating for environmental thermal variations, thus achieving both speed and precision for large, weakly active samples
2Use of energy by moving object
If direct thermal contact between sample and thermal block is established, then heat exchange is optimized, but measurement errors increase due to non-uniform temperature distribution in large containers
Solution Approach 1:
The patent uses a reference sample as a mediator that experiences identical thermal conditions including non-uniform temperature distribution. By measuring the temperature difference between reference and measured samples rather than absolute temperatures, the system cancels out errors from non-uniform heating while maintaining efficient direct thermal contact for heat exchange
3Temperature
If regulation power is increased to heat large container volumes, then temperature stabilization is improved, but measurement precision for low powers deteriorates
Solution Approach 1:
The reference sample acts as a mediator that experiences the same regulation power effects as the measured sample. By measuring the temperature difference between reference and measured samples, the system eliminates errors from imperfect regulation while maintaining the necessary regulation power for large container volumes, thus preserving precision for low-power measurements
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 accurate and precise measurement of thermal power with low uncertainty, overcoming the limitations of existing calorimeters by optimizing heat flux measurement and reducing measurement errors for large and weakly active samples.
Implementation Method 1
Peltier elements are heat sensitive elements that create a voltage proportional to the heat flux exchanged between the sample and the heat block of the calorimeter
Data Source
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AI summary
The invention relates to a flow-measuring differential calorimeter for measuring a heat flow emitted by radioactive materials contained in a container (CT), comprising: a measurement cell comprising measuring plates (PLM) distributed around a chamber for receiving the container; and a reference cell comprising reference plates (PLR) and a reference sample (ER), characterised in that the reference plates (PLR) are placed behind the measuring plates (PLM) relative to the container when it is in the receiving chamber, and in that the reference sample (ER) is under the receiving chamber.