Temperature and Humidity Stability of Fibre Optic Sensor Cables for High Resolution Measurements
Alexander Velmuzhov
Round 1
Reviewer 1 Report
Article “Temperature and humidity stability of fibre optic sensor cables for high resolution measurements” is devoted to investigation of the various parameters influence on the fiber sensors operation under conditions close to the solidification of concrete. The authors have done a great job and systematized the results. Article corresponds to the theme of the journal Sensors.
Nonetheless, to improve the article, I recommend that the authors pay attention to the following comments:
1. I would recommend that the authors in the introduction clearly formulate the purpose of the work, and not just list what it is about.
2. I recommend the authors to improve the quality of the figures, especially 4, 7 and 8.
3. The article is quite large, so I recommend the authors to check the text and figures for typos. For example, in fig. 15 missing dot in “rel H” abbreviation.
I believe that after improvement, the article can be published in the Sensors.
Comments for author File: 
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Author Response
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Reviewer 2 Report
In this paper, the authors investigated the mechanical or environmental exposure of optical fiber cables with a high-resolution optical backscatter reflectometer. The exposure regimes included three temperature cycles with sustained steps from 10°C to 60°C and back to 10°C and an increasing and decreasing humidity cycle with steps between 30 to 90 % relH. These ranges were selected to be indicative of typical environments for concrete. The results indicate that the calibration factors back-calculated from increasing and decreasing temperature or humidity cycles differed. The obtained results highlight the importance of the cable selection to maximize the FOS measurement fidelity for a given parameter of interest. This article is clear, concise, and suitable for the scope of the journal. Several small suggestions are supplied:
1. Suggest the authors supply more detail in the sentence about the Length stability analysis.
2. The authors did many experiments, and suggest adding one discussion part, now the main discussion in the conclusion part.
3. The authors present here may be used for marine engineering, suggest the authors enhance the introduction part with one last review on this topic:
Optical fiber sensing for marine environment and marine structural health monitoring: A review Optics and Laser Technology, 2021.
Author Response
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Author Response File: Author Response.pdf
