Enhanced Discrete Wavelet Transform–Non-Local Means for Multimode Fiber Optic Vibration Signal

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

This study showcased a combined enhanced discrete wavelet transform (DWT) and nonlocal mean estimation (NLM) denoising method to remove noise from heartbeat signals, which was validated by developed fiber optic microvibration sensing systems. However, before the publication, I suggest the authors to improve this work from the following aspects:

 

1. The DWT-NLM in the title should be expressed in full name.

 

2. What’s the sensing mechanism of the proposed device for ECG monitoring? From the Figure 1, the device is able to perceive mechanical variations. However, the ECG is a kind of electrophysiological signal, not the mechanical variations. As shown in the Figure 8, the outputs look like pulse waveforms. Please clear it.

 

3. There are many remarkable research articles for the CVD healthcare, such as: Chemical Engineering Journal. 2024, DOI: 10.1016/j.cej.2024.149659; Cell Reports Physical Sciences. 2023, 4, 101690; Nature, 2024, 628, 84–92; . The citation of them could enrich this research.

 

4. Why use this multimode fiber microvibration sensing system for mechanical signals detection? There are various optical fiber-based microvibration sensing system, such as: Sensors 2016, 16, 1660; doi:10.3390/s16101660; https://doi.org/10.1016/j.ceramint.2019.10.123; https://doi.org/10.1016/j.ceramint.2017.11.077 . What’s the unique advantage of the proposed sensing system in this research?

Comments on the Quality of English Language

Great.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

This paper proposes a method to reduce noise for multimode fiber optic microvibration sensing technology. The noise reduction principles and methods are described in detail, and I generally agree with the content. This technology has the potential to improve the accuracy of cardiovascular disease diagnosis, and I believe this paper deserves to be accepted.

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

Comments and Suggestions for Authors

This thesis lacks basic experimental verification and has obvious defects in content and structure. It is believed that such a thesis should not be published.

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Comments and Suggestions for Authors

The authors have addressed my concerns. I agreed to publish current version in photonics.