Stress Test Chamber Control Using Direct Sample Temperature Feedback
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Solution Overview
Problem
Existing highly accelerated stress test devices struggle to maintain high accuracy in testing due to the inability to directly measure the temperature of the test target, especially when samples generate heat or have large heat capacities, leading to deviations in ambient temperature.
Innovation Solution
The device incorporates a test space with a steam generating space, a first and second heater, first and second temperature sensors, and an item temperature sensor directly attached to the sample, with a controller managing on-off controls based on these measurements to maintain accurate test conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a sub-sensor is disposed near a test target to measure ambient temperature, then the response speed of temperature detection is improved, but the measurement precision of the test target temperature deteriorates when the sample generates heat or has large heat capacity
Solution Approach 1:
A heat transfer member (thermal conductor) is introduced as an intermediary between the test target and the sub-sensor. This heat transfer member is thermally coupled to the test target and conducts heat to the sub-sensor, allowing the sensor to indirectly measure the test target temperature without direct contact. This resolves the contradiction by enabling fast response (through close thermal coupling) while maintaining measurement accuracy (through proper thermal conduction path design).
Solution Approach 2:
The patent replaces direct mechanical contact measurement with thermal field-based measurement. Instead of physically attaching the sensor to the test target (mechanical system), the invention uses thermal conduction through a heat transfer member to transfer temperature information, substituting mechanical direct contact with a thermal field mediation approach that preserves both response speed and measurement precision.
2Ease of operation
If the test target is separated from the sub sensor to avoid direct contact, then the ease of operation is improved, but the measurement precision of the test target temperature deteriorates
Solution Approach 1:
The heat transfer member serves as a mediator that bridges the gap between the separated test target and sub-sensor. It provides a thermal conduction path that allows accurate temperature measurement without requiring direct physical contact between the sensor and test target, thus maintaining both ease of operation and measurement precision.
3Measurement precision
If multiple temperature sensors are added to directly measure sample temperature, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Rather than adding multiple sensors directly to the test target, the invention uses a single heat transfer member that acts as an intermediary, conducting thermal information from the test target to the sub-sensor. This approach achieves accurate temperature measurement without the complexity of multiple sensors and their associated wiring and control circuits.
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
This configuration allows for highly accurate testing regardless of sample type or properties, preventing excessive temperature rise or condensation, and enhancing usability with selectable test modes.
Implementation Method 1
a first heater that heats the test space
Implementation Method 2
a second heater that heats the steam generating space
Implementation Method 3
an item temperature sensor that is directly attached to the sample placed in the test space and that measures a temperature of the sample
Implementation Method 4
a steam generating space that generates steam to be supplied to the test space
Data Source
AI summary
A highly accelerated stress test device includes: a first heater that heats a test space; a second heater that heats a steam generating space; a first sensor that measures a first temperature of the test space; a second sensor that measures a second temperature of the steam generating space; an item temperature sensor that is directly attached to a sample placed in the test space and that measures an item temperature of the sample; and a controller that prepares, as candidates for a test mode, a normal mode in which on-off control of each of the first and second heaters is carried out based on the first and second temperatures, and an item-temperature mode in which the on-off control is carried out based on the item and second temperatures, and carries out the on-off control according to the test mode that is set with a test condition of the sample.