Development of high-precision and real-time three-dimensional temperature measurement method in a liquid using deep learning

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04306
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: University of Yamanashi
• Principal Investigator: Toriyama Koji 山梨大学, 大学院総合研究部, 准教授 (50313789)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 温度分布計測 / 感温液晶 / 非接触 / 感度特性 / 温度分解能

Outline of Final Research Achievements

This research is the development of a method for measuring three-dimensional temperature distribution in liquids using thermo-chromic liquid crystal particles. First, a ratiometric method was applied, but it was found that the intensity of scattered light from the thermo-chromic liquid crystal particles was not similar even at the same temperature, making the method unsuitable for temperature measurement. Therefore, a color camera was used to measure the temperature using a blue LED as the irradiation light. The RGB values were converted to HSI values, and the HS values made it possible to obtain the temperature of the temperature-sensitive liquid crystal particles, although there was a measurement error. Furthermore, the measurement capability of this method was also clarified by conducting an evaluation using a thermo-chromicliquid crystal sheet.

Free Research Field

伝熱工学

Academic Significance and Societal Importance of the Research Achievements

本研究は，廉価なカメラと比較的安価で且つ扱いが容易な感温液晶を用いることで，固体表面や液体内の温度分布計測を可能にするためのものである．今回得られた成果は，液体内の3次元温度分布に対して温度検定する新たな手法を見出したものであり，今後研究が進めば，従来実現が困難であった3次元熱流動場における温度・速度場同時計測が非浸襲に可能となる．また，これまでのレシオメトリー法を用いた表面温度計測では，複数のカメラが必要であったものの，本手法であればカラーカメラ１台のみで実現可能であり，赤外線カメラよりも高解像度の温度分布計測が可能となる．