**8. Conclusions**

The primary benefit of this paper is to present new alternative sensor systems suitable for seismic monitoring and the results of data mathematical processing. This experimental comparative study took place in simplified conditions and a total of 300 seismic phenomena were processed and evaluated in the time domain. All phenomena captured were of similar nature in the time domain.

Correlation equations in a general form were created for both sensory devices being developed, specifically *v* = *a* + *bx* for the fiber-optic sensor and *v* = *a* × *exp*(*bx*) for the pneumatic sensor. Correlation coefficients *R*<sup>2</sup> for both equations were high, 0.9907 for the optic fiber sensor and 0.9662 for the pneumatic sensor. The average deviations from the measured values of the amplitude of the oscillation velocity were very low, specifically 0.022 for the optic fiber sensor and 0.002 for the pneumatic sensor.

This initial basic laboratory comparative study showed that even with the use of a completely different physical principle, it is possible to find a very cost-effective alternative method for the purpose of measuring vibrations, but so far only in simplified conditions. Results of this experimental measurement has shown that both the fiber-optic sensor and the pneumatic sensor are able to replace a standard seismic device while using a given solution and input boundary conditions.

**Author Contributions:** M.S., J.N., R.M., J.K. and S.K. proposed the system idea and edited the manuscript. S.K., M.S., J.N., R.M., E.H, J.K. and M.P. developed, tested, and validated the data. J.N., S.K., M.F., R.M., M.S. and J.K. wrote the manuscript. S.K., M.S., R.M., E.H. and J.N. critically evaluated the quality of the research data and experimental methods used to generate/acquire them, as well as the soundness/validity of the scientific and engineering techniques, wrote the manuscript, and performed its final edits. All authors have read and agreed to the published version of the manuscript.

**Funding:** The paper has been funded with the support of conceptual development of science, research, and innovation in 2020, assigned to the VSB-Technical University of Ostrava, the ministry of Education, Youth and Sports in the Czech Republic. This work was supported by the European Regional Development Fund in Research Platform focused on Industry 4.0 and Robotics in Ostrava project, CZ.02.1.01/0.0/0.0/17\_049/0008425 within the Operational Programme Research, Development, and Education. This work was supported by SP2021/45, SP2021/119, and SP2021/32. This article was supported by the Technology Agency of the Czech Republic FW03010207 project entitled "Monitoring of parameters of rocks disintegration of small and large in scale by fiber-optic sensors".

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** This study did not report any data.

**Conflicts of Interest:** The authors declare no conflict of interest.
