Color CCD High-Temperature Measurement Method Based on Matrix Searching
Round 1
Reviewer 1 Report
The paper describes a method to improve high temperature measurements with color CCD cameras. Although some aspects of the technique are interesting, there is lack of information and validation to confirm the results. There is room for improvement in the writing of the manuscript. English needs improvement, mainly in the introduction, as currently it is difficult to follow. References sometimes appear in the text just with number, no brackets, and no superscript making it difficult to follow when reading.
As an example of a long sentence without proper grammatical structure:
“ Radiation thermometry method with its non-contact, long-range and other characteristics, making it a more effective high temperature measurement method at this stage, which is completed by the inversion of the temperature of the object to be measured through the acquisition and settlement of the thermal radiation signal of the high temperature object
Specific comments
In the Method section
Please clarify the definition of directional spectral radiance, there is no directional dependence in Eq (1), see [A]
[A] Optical Fiber Pyrometer Designs for Temperature Measurements Depending on Object Size. Sensors 2021, 21, 646. https://doi.org/10.3390/s21020646
P3 line 102 talking about received radiation intensity, no mention about direction any longer neither about spectral dependence?
P3 line 107 the intensity of the output electrical signal, it means the photogenerated current?
P3 line 110 Spectral response functions is spectral responsitivy ? or at least related as derived from the label used in Figure 1
Some mention about the way to measure the spectral emissivity, absorption and nonlinearity can be mention in this section, related to the sequence process of the technique as being an input in the preparation stage reported in Fig. 1. It is briefly described in the Experiments section but some of the general requirements should be in the Method section. Spectral emissivity is dependent on T and how this is considered in the model is not described until the Experiment section. Mainly taking into account that it is claim that the current temperature calculation process provides the ability to use a more accurate emissivity model in the measurement, and the ability to cope with the temperature measurement of multi-layer transmission media (such as the measurement of underwater targets in the air, etc.). (p7 line 242)
P5 line 140 Can you provide more information about how the selection of q and p factor is taking place? Currently it is only said “The appropriate sensitivity factors p and q are selected by 170 formula (6) to calculate the channel signal step ΔRΔG to establish the search address”
P5 line 228 What is “Quan Huafu area calculation”?
Which is the temperature range in which this technique can be applied? As being based on visible CCD cameras and using Draper point reference in calculations?
No data from the calibration experiments are provided?
The spectral emissivity model including the perturbation method to approximate the emissivity values (Eq. 12 and 13) should be clarified in terms of
What is e_W? how the connection between Temperature and wavelength is performed?
units of constant a1 should be included?
It is claim a fast high temperature measurement method (p5 line 250) but no specific data about the time required for the technique to take measurements with a specific resolution is provided.
In the Experiments section
Please provide the specifications of DAHENG IMAGING MER2-134-90GC type camera in terms of gain, responsivity, time response, lenses and other parameters relevant to the measurements and experimental set-up. The same applied for SA-Z high-speed camera
P8 line 287 The results are in good agreement with the experimental results as showed in Fig. 5. There is no explanation about how measurements are taken where are they in Fig. 5.a? They are compare with simulations for different “m” values in Fig. 5.b?
Spectral Emittance appears for the first time in p 8 line 292, please clarify.
P8 line 306 Please provide specification of the platinum-rhodium thermocouple used in the measurements, sensitivity, temperature error, temperature range, time response, dimensions, manufacturer,
In the experimental set-up, how the thermocoupler is fixed to keep a constant position and reference? Conditioning circuit of thermocouple and adquisition system? How the sincronization Is performed?
It is said “which in this experiment is the square area surrounded by the horizontal 532-540 and vertical 370-380 pixels, as showed in Fig.8.” But there is no way to identify any pixel position in that figure¿?
It is said “under short exposure, as shown in the comparison between Fig.8 and Fig.9.” But there is no clear description about how both images have been taken.
In the results section
It is said that “The results of the two plots will correspond to the spectral response curve s(λ) and the current-gray scale conversion factor gi 355 in Eq. (3), respectively”, can you explain how in fact s(λ) from those measurements
P11 line 362 “electrocoupler” please revise
How many N pixels are used to estimate the error in Eq(14)? How it is control the movement of the point sensor (I understand the thermocoupler) to be able to take the measurement with high spatial resolution? Which is the spatial resolution of images or measurements shown in Figure 11? Which is the error in the measurements performed with the thermocoupler which is considered as the calibration reference for measuring real temperature?
Gamma correction is included in the model but have not been tested experimentally, why?
How long does it take to take and process the measurements? There is no comparison with other techniques in the state of the art.
Typos examples
P1 line 33, some references are missing
P2 line 76 “comma instead of point, and capital letter after a comma? (this happens several times along the text)
In Eq (8) when defining G “j” instead of “I” should be considered?
P5 line 225 “the minimum number of columns and the minimum number of columns” please check
Figure 4 experimental set-up instead of experimental devices, there are more than one device as part of the set-up no? Distance and dimensions should be included from CCD to blackbody
MODTRAN® instead of MODTRAN
Author Response
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Reviewer 2 Report
This work presents a solution to the forward problem associated with temperature measurements using radiation thermometry methods employing charge-coupled devices (CCDs). This approach presents computational and accuracy advantages over the conventional inverse problem of decoding grayscale or colorized images into temperature fields, typically by approximating the infrared emissivity of the material. The theoretical model is well explained, and the well-designed experiments (including calibration experiments) are carried out to test and demonstrate the forward problem model. The relative error is <3% from these experiments. This work represents an advancement in the field of IR imaging for high temperature measurements and is therefore suitable for publication in Applied Sciences, provided the following minor comments are addressed:
1. In the manuscript, the references are not formatted correctly. This made it very difficult to follow the cited references in the main text. Please fix this.
2. In terms of solution accuracy, how does the forward problem compare to using the conventional inverse problem that estimates the emissivity? Please highlight the improvement that this matrix-searching algorithm presents.
3. Please comment on the computation efficiency (time saved) using the forward vs. inverse solution approaches to the problem.
Author Response
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Reviewer 3 Report
Errors
Wrong link on line 33.
Absence of punctuation marks in sentences with formulas.
The incomprehensible algorithm in Fig. 3.
There are 28 references in the last page. References in the text of the paper are made only to some of them.
The remaining references must be removed, it is not related to the manuscript.
Up and down indexes are turned into plain text in many cases.
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Reviewer 4 Report
Manuscript ID: applsci-2258124
Review of the manuscript “Color CCD high-temperature measurement method based on matrix searching” by C. Li et al. submitted for consideration to Applied Sciences.
In this manuscript, the authors have proposed a matrix method for color CCD high-temperature measurement. They have carried out an experiment in order to validate their method. The measured temperature and the calculated one have been compared. The results indicated that the measurement error is about 2.5%-2.7%. In addition, the method has been investigated in presence of the perturbation emissivity and chromaticity. I believe the manuscript is original and be of interest to the readers. However, the manuscript is not scientifically written and it is not well organized. In addition, I will bring out some points to be clarified as part of the changes for the manuscript.
- There are many vague sentences and English language errors in the manuscript. Most part of the text is hard to understand by readers.
- Most part of the text is not properly cited.
- The authors should discuss the physical/scientific reason (main cause) behind the description of the results. As an example: for the sentence stated in line 400-401.
Author Response
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Round 2
Reviewer 1 Report
Thank you for covering all resquested questions
Author Response
Dear reviewer
Thank you for your feedback.
Yours sincerely Chao Li
Reviewer 4 Report
I have already evaluated the revised version of the manuscript. I would like to thanks authors for responding my comments. My third comment (the main one) has not been properly addressed in the revised manuscript. I expected the authors provided more appropriate answer. I meant that the underlying physics of all the results be discussed. I recommend the authors to consider this comment.
Author Response
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