Design and Fabrication of Large-Size Powersphere for Wireless Energy Transmission via Laser

Round 1

Reviewer 1 Report

In this work authors design a powersphere by using photovoltaic cells for wireless transmission of energy via a laser, and compare its performance with a photovoltaic panel.

It is an overall interesting and innovative work, but more clarifications and improvements have to be done.

The most significant of them are:

-In table 1 there is significant divergence between the results of Area 2 and the other Areas. Where this fact lies in? Authors have to comment analytically on this. The same on some columns for the photovoltaic panel.

-Authors need to be more analytic about the photovoltaic panel experiments. What is the alignment of the laser beam? By changing the alignment will the panel results be affected? Maybe there should be measurements for different cases of alignment in the panel scenario.

And some other minor are:

-In the Abstract only the main idea and basic information about this work should be mentioned. Please move all the further technical info in another section.

-Intro section must be more comprehensive about the already existing literature. Furthermore, you have to mention the technical advantages and the application and not only the corresponding references. Additionally, authors have to present analytically their motivation and the contribution of this work in this section.

-In lines 92 and 95 you mention the same sentence twice.

-In figure 13 units of measurement must be added in the axes. Moreover, the caption of this figure needs format editing.

-Table 4 needs format editing in the second column, please correct the “vlotage ratio”.

-In the conclusions section please remove the same technical info that have already mentioned in previous sections, and keep only some comments about the derived results, the main idea and the contribution of this work

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

Good morning,

I am very glad that I could review this article. The article was presented in an interesting way, however it is not very innovative. The application of the powersphere for power transmission via laser is already known and similar patent can be found.  However, despite this, I have some significant remarks and doubts that should be discussed.

1. The Authors in their work did not provide information on the total efficiency of the powersphere system and its relation to the efficiency of a single photovoltaic panel.
2. I have doubts about the methodology and would like to ask for clarification. Fig. 11b shows that a relatively large photovoltaic panel has been used for the tests (36 pieces of 70mm×70mm photovoltaic cells). It has incomparably larger dimensions than the diameter of the laser spot (2mm). Is this 70x70mm panel composed of many photovoltaic cells connected in strings and branches? If it does, it seems to me that the use of such a large photovoltaic panel to generate electricity from a laser is incorrect, due to the fact that the laser light illuminate only a specific group of photovoltaic cells while the other remain shaded.
3. Have other sources of lighting that could cause interference been eliminated during the tests? I mean the test with the single photovoltaic panel. The Authors did not indicate this in the article.
4. In the section 2 there is the following sentence:
   “It can be seen from the illuminance formula that the illuminance at any position on the inner wall of the powersphere is equal, and the value E is proportional to the total luminous flux of the incident laser”
   Can it be supported by the measurements? Could you add the literature that would support this theorem?
5. Lines 92,93 and 94,95 are the same.
6. What is the innovation shown in the article?
7. In Fig 13. the axes have not been marked.

Best Regards

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

Authors made all of the corresponding changes for my recommendations and answered to all of my questions.

I have no more comments.

Reviewer 2 Report

Good day,

Thank you for your response and for introducing my comments. The paper looks fine now and i have no more comments.

Best Regards

This manuscript is a resubmission of an earlier submission. The following is a list of the peer review reports and author responses from that submission.