Zobrazeno 1 - 10
of 431
pro vyhledávání: '"Vyacheslav A. Trofimov"'
Autor:
Vyacheslav A. Trofimov, Dmitry M. Kharitonov, Mikhail V. Fedotov, Yongqiang Yang, Di Wang, Zhiheng Tai
Publikováno v:
Applied Sciences, Vol 13, Iss 12, p 7341 (2023)
Third-harmonic generation (THG) is of interest for its various applications. We propose using the cascaded second-harmonic generation (SHG) to implement the frequency conversion process, which is similar to that occurring in a medium with cubic susce
Externí odkaz:
https://doaj.org/article/532b4d81611c475b8e47d4024c05dd83
Publikováno v:
Applied Sciences, Vol 13, Iss 6, p 3460 (2023)
Warping and dross formation are the main defects of an overhang structure formed by laser powder bed fusion. In order to study these defects, a seven−shaped overhang structure with different lengths and heights of the overhang was printed. The infl
Externí odkaz:
https://doaj.org/article/b7314c1439d0449e9a6e0c7041fd508c
Publikováno v:
PLoS ONE, Vol 17, Iss 10 (2022)
Infrared and THz optics has many promising practical applications such as in spectroscopy, diagnostic, optical metrology, sensing, and many others. Due to limited number of IR radiation sources, the frequency down-conversion processes are widely used
Externí odkaz:
https://doaj.org/article/23565751e54a4073ad8f6a44b819b2b5
Publikováno v:
Chemosensors, Vol 10, Iss 7, p 275 (2022)
We propose and discuss an effective tool for substance detection and identification using a broadband THz pulse that is based on frequency conversion near the substance absorption frequencies. With this aim, we analyze the evolution of spectral inten
Externí odkaz:
https://doaj.org/article/877f9a869ebe4f878ec1cc143ec09a94
Publikováno v:
Applied Sciences, Vol 12, Iss 8, p 3891 (2022)
Difference-frequency generation is a well-known method of obtaining IR and THz radiation. It has many practical applications, such as sensing, optical metrology, diagnostics, detection and identification of substances, etc. One of the generation meth
Externí odkaz:
https://doaj.org/article/b172c90f18594a6d807e7fd659cef3b6
Publikováno v:
Sensors, Vol 20, Iss 7, p 1859 (2020)
The appearance of the spurious absorption frequencies caused by the frequency conversion process at the broadband THz pulse propagation in a medium is theoretically and experimentally discussed. The spurious absorption frequencies appear due to both
Externí odkaz:
https://doaj.org/article/224d81903e04492c92e80fdcb4f221e5
Publikováno v:
Sensors, Vol 15, Iss 6, Pp 12103-12132 (2015)
We propose an effective method for the detection and identification of dangerous substances by using the broadband THz pulse. This pulse excites, for example, many vibrational or rotational energy levels of molecules simultaneously. By analyzing the
Externí odkaz:
https://doaj.org/article/d45d90b2111e44b3b088ed627ca8c51a
Publikováno v:
Sensors, Vol 19, Iss 10, p 2365 (2019)
We discuss an effective tool for the detection and identification of substances in ternary mixtures with similar spectral properties using a broadband reflected THz signal. Nowadays, this is an urgent problem; its effective solution is still far off.
Externí odkaz:
https://doaj.org/article/d3ac186035744fb699f9d1754a63efd3
Publikováno v:
Sensors, Vol 17, Iss 12, p 2883 (2017)
We have studied the spectral resolution influence on the accuracy of the substance detection and identification at using a broadband THz pulse measured under real conditions (at a distance of more than 3 m from a THz emitter in ambient air with a rel
Externí odkaz:
https://doaj.org/article/955a039c02e247b39f15740bdcb17610
Publikováno v:
Sensors, Vol 17, Iss 12, p 2728 (2017)
Using an experiment with thin paper layers and computer simulation, we demonstrate the principal limitations of standard Time Domain Spectroscopy (TDS) based on using a broadband THz pulse for the detection and identification of a substance placed in
Externí odkaz:
https://doaj.org/article/b424e71aab264cc1a0308d1b61148e09