Theoretical and experimental study of second order dynamic effects in nanocomposite thin film thermocouples affected by substrate roughness.

Haoyu Wang, Yunxian Cui, Huan Zhang, Fengyuan Ma, Haiyi Bai, Wanyu Ding, Junwei Yin

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Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Haoyu WangSchool of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, China.

Yunxian CuiSchool of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, China.

Huan ZhangSchool of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, China.

Fengyuan MaSchool of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, China.

Haiyi BaiSchool of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, China.

Wanyu DingSchool of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, China.

Junwei YinSchool of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, China. yjwzx@djtu.edu.cn.

Funding

Applied Basic Research Program (Youth Project) of Liaoning Province 2023JH2/101600060National Natural Science Foundation of China 52072056National Natural Science Foundation of China 52175379National Natural Science Foundation of China 52275407

6 · The paper itself

Abstract

Thin-film thermocouples (TFTCs) are crucial for transient temperature measurement; however, their oscillatory response remains inadequately understood and controlled. This study develops a second-order transient heat transfer model to analyze the impact of substrate roughness on the damping ratio and dynamic performance of TFTCs. Theoretical analysis reveals that adjusting substrate roughness modulates the damping ratio. To validate these findings, TFTCs with varying substrate roughness were fabricated and characterized using pulsed laser excitation and frequency response analysis. The results confirm that TFTCs exhibit nanosecond-scale second-order dynamic behavior, with a 59 ns oscillation period. Lower substrate roughness enhances phase margin and stability, while higher roughness mitigates oscillatory behavior by increasing damping. By fine-tuning substrate roughness, the dynamic performance of TFTCs can be tailored to optimize sensitivity and stability in transient temperature measurements. This study establishes a novel framework for tuning TFTC dynamic performance through substrate roughness control, providing valuable insights for optimizing sensitivity and stability in transient temperature measurements and advancing high-precision sensing technologies.

Indexed as

Damping ratioDynamic response characteristicsSecond-order heat transfer modelThin-film thermocouplesTransient temperature measurement

Identifiers

PMID41249399

DOI10.1038/s41598-025-24164-8

PMCPMC12623471

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.