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Correction to Appl. Sci. 2022, 12(3), 1629.
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Correction

Correction: Stelmaszczyk et al. Ultrafast Time-of-Flight Method of Gasoline Contamination Detection Down to ppm Levels by Means of Terahertz Time-Domain Spectroscopy. Appl. Sci. 2022, 12, 1629

by
Kamil Stelmaszczyk
1,*,
Ewelina Karpierz-Marczewska
1,
Valeri Mikhnev
1,
Grzegorz Cywinski
1,
Thomas Skotnicki
1,2,3 and
Wojciech Knap
1,4
1
CENTERA Laboratories, Institute of High Pressure Physics Polish Academy of Sciences, ul. Sokołowska 29/37, 01-142 Warsaw, Poland
2
CEZAMAT Centre for Advanced Materials and Technologies, Warsaw University of Technology, ul. Poleczki 19, 02-822 Warsaw, Poland
3
Institute of Microelectronics and Optoelectronics, Faculty of Electronics and Information Technology, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warsaw, Poland
4
Laboratoire Charles Coulomb, UMR, CNRS 5221, 34095 Montpellier, France
*
Author to whom correspondence should be addressed.
Appl. Sci. 2022, 12(10), 5157; https://doi.org/10.3390/app12105157
Submission received: 28 April 2022 / Accepted: 13 May 2022 / Published: 20 May 2022
(This article belongs to the Special Issue THz Spectroscopy Method for Substance Detection and Its Identification)
Browse Figures
Versions Notes

Error in Figure

The authors wish to make the following corrections to their paper [1].
In the original publication, there was a mistake in Figure 1 and Figure 6c as published. Figure 1 was erroneously printed as its mirror inversion. Furthermore, there was a mistake in the legend for Figure 1. The legend contained the text “490°” and “290°”, which would cause a misunderstanding of the right meaning “four 90°” and “two 90°”. Additionally, Figure 6c did not include the dashed rectangular box focusing the reader’s attention to the inset of the figure. The corrected Figure 1 and Figure 6c appears below. The authors apologize for any inconvenience caused and state that the scientific conclusions are unaffected. The original publication has also been updated.

Reference

  1. Stelmaszczyk, K.; Karpierz-Marczewska, E.; Mikhnev, V.; Cywinski, G.; Skotnicki, T.; Knap, W. Ultrafast Time-of-Flight Method of Gasoline Contamination Detection Down to ppm Levels by Means of Terahertz Time-Domain Spectroscopy. Appl. Sci. 2022, 12, 1629. [Google Scholar] [CrossRef]
Applsci 12 05157 g001 550
Figure 1. Schematic representation of the measurement setups: (a) 4f setup consisting of four 90° off-axis parabolic mirrors, which were used to measure THz pulse TOFs through the gasoline admixtures samples in quartz cuvettes of 1.00, 2.00, and 5.00 mm lengths in a focused beam configuration without a time-reference pulse; (b) 2f setup consisting of two 90° off-axis parabolic mirrors used for the measurements in a 10.00 mm-long TPX cuvette with a time-reference pulse. Note that the diameter of the THz beam is somewhat larger than the size of the cuvette and passes freely through the inert gas, serving as a reference for the measured TOF. The indicated focal lengths are not to scale.
Figure 1. Schematic representation of the measurement setups: (a) 4f setup consisting of four 90° off-axis parabolic mirrors, which were used to measure THz pulse TOFs through the gasoline admixtures samples in quartz cuvettes of 1.00, 2.00, and 5.00 mm lengths in a focused beam configuration without a time-reference pulse; (b) 2f setup consisting of two 90° off-axis parabolic mirrors used for the measurements in a 10.00 mm-long TPX cuvette with a time-reference pulse. Note that the diameter of the THz beam is somewhat larger than the size of the cuvette and passes freely through the inert gas, serving as a reference for the measured TOF. The indicated focal lengths are not to scale.
Applsci 12 05157 g001
Applsci 12 05157 g006 550
Figure 6. Time correction procedure of the THz pulse: (a) Actually measured waveforms of the reference pulse before correction; (b) The same waveforms brought to the common “zero delay” time after correction. The applied correction is also valid for the pulses propagating through gasoline samples during the measurements. The color code of the arrows above the pulses is used consistently with previous figures; (c) The measured evolution of the peak amplitude of the THz reference pulse during approx. 2.5 h-long series of the measurements. The positions of the peaks with fit errors were determined by numerical fit with a predefined function. The inset of the graph shows small-scale oscillations of the pulse position in detail.
Figure 6. Time correction procedure of the THz pulse: (a) Actually measured waveforms of the reference pulse before correction; (b) The same waveforms brought to the common “zero delay” time after correction. The applied correction is also valid for the pulses propagating through gasoline samples during the measurements. The color code of the arrows above the pulses is used consistently with previous figures; (c) The measured evolution of the peak amplitude of the THz reference pulse during approx. 2.5 h-long series of the measurements. The positions of the peaks with fit errors were determined by numerical fit with a predefined function. The inset of the graph shows small-scale oscillations of the pulse position in detail.
Applsci 12 05157 g006
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MDPI and ACS Style

Stelmaszczyk, K.; Karpierz-Marczewska, E.; Mikhnev, V.; Cywinski, G.; Skotnicki, T.; Knap, W. Correction: Stelmaszczyk et al. Ultrafast Time-of-Flight Method of Gasoline Contamination Detection Down to ppm Levels by Means of Terahertz Time-Domain Spectroscopy. Appl. Sci. 2022, 12, 1629. Appl. Sci. 2022, 12, 5157. https://doi.org/10.3390/app12105157

AMA Style

Stelmaszczyk K, Karpierz-Marczewska E, Mikhnev V, Cywinski G, Skotnicki T, Knap W. Correction: Stelmaszczyk et al. Ultrafast Time-of-Flight Method of Gasoline Contamination Detection Down to ppm Levels by Means of Terahertz Time-Domain Spectroscopy. Appl. Sci. 2022, 12, 1629. Applied Sciences. 2022; 12(10):5157. https://doi.org/10.3390/app12105157

Chicago/Turabian Style

Stelmaszczyk, Kamil, Ewelina Karpierz-Marczewska, Valeri Mikhnev, Grzegorz Cywinski, Thomas Skotnicki, and Wojciech Knap. 2022. "Correction: Stelmaszczyk et al. Ultrafast Time-of-Flight Method of Gasoline Contamination Detection Down to ppm Levels by Means of Terahertz Time-Domain Spectroscopy. Appl. Sci. 2022, 12, 1629" Applied Sciences 12, no. 10: 5157. https://doi.org/10.3390/app12105157

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