Flash Thermophysical Measurement Using Periodic Pulse Spectra
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Solution Overview
Problem
The flash method for measuring thermophysical properties faces challenges in securing a sufficient signal-to-noise ratio (S/N) of the measurement signal, which can lead to thermal damage or changes in the thermophysical properties of the measurement target due to unintended temperature rise.
Innovation Solution
A thermophysical property value measurement device and method that uses periodic pulsed light irradiation, temperature measurement, and computational analysis to enhance the S/N ratio while preventing damage, involving a light emitting unit, temperature measuring unit, and computation unit to calculate thermophysical properties based on periodic temperature data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light intensity of the pulsed light is increased to acquire the S/N ratio of the measurement signal, then the S/N ratio is improved, but the measurement target member may be thermally damaged or the thermophysical property may change
Solution Approach 1:
The patent applies periodic pulsed light irradiation instead of single pulsed light. By irradiating the measurement target member with pulsed light that periodically flashes multiple times, the temperature rise is distributed over multiple cycles, preventing excessive temperature increase while accumulating sufficient thermal signal for accurate measurement. This resolves the contradiction by maintaining low peak temperatures (preventing damage) while achieving high S/N ratio through signal accumulation over multiple periods.
2Measurement precision
If a single pulsed light is used for irradiation, then the measurement time is short and operation is easy, but the S/N ratio of the measured signal cannot be sufficiently secured
Solution Approach 1:
The patent uses continuous periodic pulsed light irradiation where the light flashes repeatedly at a predetermined frequency. This continuous useful action accumulates thermal energy in the measurement target member over multiple cycles, building up the temperature signal amplitude without requiring excessively long measurement time. The periodic continuation of the heating action allows signal accumulation while maintaining measurement efficiency.
Solution Approach 2:
By using pulsed light that periodically flashes multiple times at a controlled frequency, the system accumulates thermal signal over several cycles. The periodic nature allows the temperature signal to build up amplitude progressively, achieving sufficient S/N ratio within a reasonable time frame without requiring a single high-intensity pulse that would cause damage.
3Measurement precision
If periodic pulsed light is used to enhance S/N ratio, then measurement accuracy is improved, but the device complexity increases due to additional computational processing
Solution Approach 1:
The computation unit analyzes the periodic temperature data by comparing it with the periodic pulse temperature spectrum analytical solution, using feedback from the temperature measurements to calculate thermophysical property values. The system uses the measured periodic temperature response and feeds it back through the analytical solution to determine the thermophysical properties, creating a closed-loop calculation process that improves accuracy while managing computational complexity through established mathematical models.
Solution Approach 2:
The patent introduces a periodic pulse temperature spectrum analytical solution as an intermediary between the raw temperature measurements and the final thermophysical property values. This analytical solution serves as a mathematical mediator that transforms the periodic temperature data into meaningful thermophysical parameters, simplifying the computational process while maintaining high measurement accuracy through established heat diffusion theory.
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 solution enhances measurement accuracy by increasing the S/N ratio and prevents thermal damage and property changes, ensuring precise thermophysical property determination.
Implementation Method 1
a light emitting unit that irradiates a measurement target member with a pulsed light that periodically flashes
Implementation Method 2
a temperature measuring unit that measures a temperature of the measurement target member
Data Source
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Figure 2A~2B
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AI summary
It is provided new thermophysical property value measurement device and thermophysical property value measurement method, which can enhance measurement accuracy of a thermophysical property value by increasing the S/N ratio of a measurement signal, while preventing a measurement target member from being damaged and a thermophysical property from varying due to unintended temperature rise, in measurement of the thermophysical property value by a flash method. A thermophysical property value measurement device 100 according to the present disclosure includes: a light emitting unit 20 that irradiates a measurement target member S with a pulsed light that periodically flashes; and a computation unit 62 that computes periodic temperature data from a temperature measuring unit 30. The computation unit 62 generates a periodic temperature spectrum from the periodic temperature data, retrieves a periodic pulse temperature spectrum analytical solution acquired from a theoretical formula of temperature change by a single pulsed light, calculates respective parameters of the periodic pulse temperature spectrum analytical solution, supposing that the periodic pulse temperature spectrum analytical solution matches the periodic temperature spectrum, and calculates a thermophysical property value of the measurement target member S, based on the calculated respective parameters.