A Robust and Highly Integrated Laser Doppler Velocimeter for High-Precision Velocity Measurement of Hot-Rolled Bars Under Thermal Radiation.

Zimu Li, Lewen Zhang, Cheng Zuo, Jinhui Shi, Ming Fang, Yiren Wang, Wenbin Wu, Haibin Wu

Abstract read

In one paragraph

Article in Sensors (Basel, Switzerland), 2026. 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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Authors and funding

8 authors.

Zimu LiSchool of Electronic and Information Engineering, Hefei Institute of Technology, Hefei 238076, China.ORCID 0000-0002-6608-7247

Lewen ZhangSchool of Electronic and Information Engineering, Hefei Institute of Technology, Hefei 238076, China.ORCID 0000-0003-1307-7480

Cheng ZuoSchool of Electronic and Information Engineering, Hefei Institute of Technology, Hefei 238076, China.

Jinhui ShiSchool of Electronic and Information Engineering, Hefei Institute of Technology, Hefei 238076, China.

Ming FangSchool of Electronic and Information Engineering, Hefei Institute of Technology, Hefei 238076, China.

Yiren WangSchool of Artificial Intelligence Engineering, Hefei Institute of Technology, Hefei 238076, China.

Wenbin WuSchool of Artificial Intelligence Engineering, Hefei Institute of Technology, Hefei 238076, China.ORCID 0000-0002-6491-1642

Haibin WuSchool of Electronic and Information Engineering, Hefei Institute of Technology, Hefei 238076, China.

Funding

Natural Science Research Program for Universities in Anhui Province 2023AH050093, 2025AHGXZK30381 and 2025AHGXZK30827Postdoctoral Fellowship Program GZC20230014

6 · The paper itself

Abstract

Real-time, non-contact velocity measurement of hot-rolled bars is critical for metallurgical process control, but conventional laser Doppler velocimetry (LDV) systems often fail in these environments. The intense broadband thermal radiation from targets up to 1000 °C, coupled with severe surface depolarization, overwhelms weak scattered signals in high-speed (up to 40 m/s) rolling zones. To address this issue, we developed a fully integrated, thermal-radiation-resistant LDV sensing system. Hardware optimization was achieved by eliminating polarized-light transmission and adopting a parallel-beam design, which significantly enlarges the laser overlap area and increases detection depth. Furthermore, a 1550 nm laser (100 mW) was coaxially combined with a 10 nm narrow-band filter to isolate the thermal background and boost signal strength. A customized workflow utilizing continuous Fourier transform (CFT) spectral refinement and energy centroid estimation was implemented to precisely extract the true Doppler shift. Performance evaluations show the system achieves an excellent signal-to-noise ratio (SNR) of 29,532. Allan variance analysis confirms a stable detection sensitivity of 0.003 m/s (0.1 s integration time), a local short-to-medium-term optimal limit of 1.6 × 10

Indexed as

hot-rolled barslaser Doppler velocimetrynear-zero tension rollingspectral refinementthermal radiation

Identifiers

PMID42451288

DOI10.3390/s26134046

PMCPMC13364435

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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.