Calorimeter with Nested Temperature Stages for Microkelvin Stability
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Solution Overview
Problem
Conventional calorimeters are inadequate for analyzing small volume samples due to insufficient thermal stability, which results in weak signal detection and noise interference, particularly in fields like life sciences and pharmaceuticals where sample quantities are limited.
Innovation Solution
A high-performance calorimeter with multiple stages of temperature regulation, including a first stage thermally decoupled from the environment, a second stage using high-power Peltier effect elements, and a third stage with passive thermal conductances, providing a stable thermal environment suitable for microliter-scale samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calorimeters are used to measure heat quantities, then measurement capability is provided, but temperature stability is insufficient (millikelvin level), resulting in weak signal detection and noise interference for small volume samples
Solution Approach 1:
The calorimeter is divided into three nested temperature control stages (first stage with external environment isolation, second stage with Peltier effect elements, third stage with passive thermal conductances) that progressively isolate the measurement sensor from external thermal disturbances, achieving microkelvin-level temperature stability
Solution Approach 2:
The patent implements a nested structure where the second temperature control stage is placed inside the first stage enclosure, and the third stage is placed inside the second stage enclosure. Each nested stage provides an additional layer of thermal isolation, with the innermost stage containing the measurement sensor and achieving the highest temperature stability
2Quantity of substance
If sample volume is reduced to microliter scale for life sciences and pharmaceuticals, then sample quantity requirement is minimized, but thermal stability becomes insufficient leading to weak signal detection
Solution Approach 1:
The patent applies different temperature control strategies to different spatial zones: the first stage uses active cooling with Peltier elements for gross temperature control, while the third stage (measurement zone) uses passive thermal conductances with high thermal time constant for fine temperature stability, creating local optimization of thermal properties
3Measurement precision
If temperature control is enhanced to achieve microkelvin stability, then measurement precision improves, but device complexity increases with multiple control stages
Solution Approach 1:
The patent employs dynamic temperature control where the first two stages use active Peltier effect elements for rapid temperature adjustment and stabilization, while the third stage relies on passive thermal conductances with inherently slow response (high thermal time constant), creating a dynamic hierarchy that achieves stability without over-controlling the measurement zone
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 calorimeter achieves temperature stability of a few microkelvins, enabling accurate measurements on small volume samples by effectively isolating the measurement sensor from external thermal disturbances and maintaining precise temperature control.
Implementation Method 1
a second stage placed in said first enclosure and thermally coupled to the support of this first stage by first thermal conductances consisting of Peltier effect elements
Data Source
Figure 1~2
Figure 3~4
Figure 5a~6b
AI summary
The invention relates to a calorimeter including at least one measurement sensor (4) for receiving at least one sample, and at least three stages (1, 2, 3) for controlling the temperature, with decreasing size, each including a mounting (10, 20, 30) and means for controlling the temperature, the smallest stage being associated with said at least one sensor (4), in which: a first stage (1) also includes a screen (11) forming a first enclosure with the mounting (10) of said first stage; a second stage (2) is placed inside (12) said first enclosure and the mounting (20) thereof is thermally coupled with the mounting (10) of the first stage by first thermal conductances (23) comprising Peltier elements; and a third stage (3) is placed inside the second enclosure defined by the second stage and is thermally coupled with said second stage (2) by second passive thermal conductances (33) defining an adapted time-constant value.