Analytical Description of the Spectral Characteristics of a Refractive Index Sensor Based on a Reflection Interferometer

The necessity of studying the nature of the propagation of the maximum of the laser radiation pattern in the Anderson differential cell is substantiated. A new technique has been developed for conducting these studies, which takes into account all factors when constructing the trajectory of the maximum laser radiation in the cuvette, as well as outside it (up to the sensor of the photodiode line, on which the radiation is recorded). For the first time, an equation was derived to study the change in the nature of the propagation trajectory of the maximum of laser radiation in the Anderson cell, and beyond it, depending on its various parameters, the values of the refractive indices of the reference ns and the liquid medium under study, nm. The results of checking the reliability of the developed equation are presented. For the first time, a 12th degree polynomial was obtained for Anderson's differential cell with respect to the refractive index of the medium under study to obtain an analytical solution of the developed equation. This solution will provide additional information about the physics of the processes under consideration and the relationships between different quantities. Keywords: laser radiation, refraction, liquid, refractive index, Anderson cell, spread trajectory, equation, polynomial.

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“…1 Это позволило получить следующее соотношение для L: Состояние воды и раствора определяется по измеренному значению n m с использованием (8). Полученные результаты совпадают с данными исследований других ученых [13,15,18,19,20,[22][23][24].…”

Section: уравнение для описания изменения оси лазерного излученияunclassified

О Формировании Траектории Оси Лазерного Излучения В Дифференциальной Кювете Андерсона

Гольдберг¹,

Давыдов²,

Кочетков³

et al. 2023

Журнал Технической Физики

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The necessity of studying the nature of the propagation of the maximum of the laser radiation pattern in the Anderson differential cell is substantiated. A new technique has been developed for conducting these studies, which takes into account all factors when constructing the trajectory of the maximum laser radiation in the cuvette, as well as outside it (up to the sensor of the photodiode line, on which the radiation is recorded). For the first time, an equation was derived to study the change in the nature of the propagation trajectory of the maximum of laser radiation in the Anderson cell, and beyond it, depending on its various parameters, the values of the refractive indices of the reference ns and the liquid medium under study, nm. The results of checking the reliability of the developed equation are presented. For the first time, a 12th degree polynomial was obtained for Anderson's differential cell with respect to the refractive index of the medium under study to obtain an analytical solution of the developed equation. This solution will provide additional information about the physics of the processes under consideration and the relationships between different quantities.

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“…The base layer with a refractive index of n b determines the free spectral range of RI, and also forms a highly reflective mirror M 2 with a reflection coefficient of R 3 at the boundary of the base and the analyzed medium (Analyte) with a refractive index n a . A more general theory of RI as applied to this problem can be found in [5]. We give formulas describing the reflection coefficient R of such a system under conditions when the angle of incidence is greater than the FTIR angle (sin θ b > n a sin θ b /n b ) for Base -Analyte media, i.e.…”

Section: Ri Theory For Inclined Light Incidencementioning

confidence: 99%

“…In literature, the latter type of sensors is called inverted [3,4]. In this paper, the second type of sensors is investigated and the possibility of obtaining ultra-high characteristics using the reflection interferometer (RI) method is experimentally demonstrated [5,6]. The method allows the sensor to be manufactured using the standard technology of multilayer dielectric coatings and base metal.…”

Section: Introductionmentioning

confidence: 99%

Experimental implementation of a spectral refractive index sensor based on a reflection interferometer

V.S.

¹

,

V.A.

²

2022

Optics and Spectroscopy

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Experimental study of the sensor in the Kretschmann optical scheme, in which the sensitive element is a reflection interferometer (RI) for the oblique incidence of light, is presented for the first time. A brief theory of RI is given. The experimental sample was used to measure the refractive index of the residual atmosphere in a vacuum chamber during its pumping. The high Q-factor of the RI resonator made it possible to obtain a fairly narrow spectral maximum with a width of 1.7 nm. The spectral sensitivity of the sensor was 1000 nm/RIU and the quality parameter was 529 RIU-1, it was also demonstrated that resolution of 6.5·10-8 RIU can be achieved. Proposals for further improvement of the sensor characteristics are formulated. Keywords: reflection interferometer, total internal reflection, refractive index sensor.

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Analytical Description of the Spectral Characteristics of a Refractive Index Sensor Based on a Reflection Interferometer

Cited by 3 publications

References 8 publications

On the Formation of the Trajectory of Propagation of Laser Radiation in the Anderson Differential Cell

On the Formation of the Trajectory of Propagation of Laser Radiation in the Anderson Differential Cell

О Формировании Траектории Оси Лазерного Излучения В Дифференциальной Кювете Андерсона

Experimental implementation of a spectral refractive index sensor based on a reflection interferometer

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