Acousto-Optic Monochromator with a Controlled Width of The Instrumental Function

Mazur, M. M.; измерений, Rus Всероссийский научно-исследовательский институт физико-технических и радиотехнических; наук, Научно-технологический центр уникального приборостроения Российской академии; Пустовойт, В. И.; Suddenok, Yu. A.; Shorin, V. N.; Scientific,

doi:10.25210/jfop-1802-020037

Cited by 4 publications

(4 citation statements)

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“…At present, many tasks can be solved in science and technics with the help of FOSs. They are useful for measuring temperature [26][27][28], deformation [29,30], rotation speed [31], acceleration [32,33], vibration [34,35], liquid level [36,37], and other parameters [38][39][40][41][42][43][44][45]. Separately, it is worth highlighting the ability of optical fiber to register acoustic vibrations in various environments [46][47][48], as well as vibrations of various objects and mechanisms [49][50][51], which forms the basis of acoustic diagnostics of technical objects, in particular, power plants, where non-invasive monitoring of the state of individual units is required, including GTUs used in GT engines, liquid rocket engines, and gas compressor stations.…”

Section: Introductionmentioning

confidence: 99%

Non-Invasive Acoustic Monitoring of Gas Turbine Units by Fiber Optic Sensors

Stepanov

Zhirnov

Sazonkin

et al. 2022

Sensors

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In this article, we study the possibility of gas turbine unit (GTU) monitoring using interferometric fiber optic sensors. We used the Mach–Zehnder interferometer (MZI) scheme, which can be easily implemented and simply installed on the turbine, and also allows us to solve the problem of phase unwrapping conveniently. In this research, the following main steps were carried out: an experimental scheme based on the MZI was assembled, and its sensitive arm was fixed on the GTU under study; data on various operation modes of the GTU was collected; the data were subjected to frequency FFT analysis, based on which the main rotational speeds of the turbine were identified. With FFT analysis, we also demonstrated multiples harmonics, which appear in the case of GTU after operating time, caused by the number of blades. The possibility of GTU monitoring and analysis using a non-invasive compact fiber-optic sensor is demonstrated: spectral analysis is used to detect the rotor speed, as well as the presence or absence of high-order multiple frequencies indicating blade and bearing defects, which are determined by the number of GTU’s blades and rolling bearing used as turbines rotor supports.

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Section: Introductionmentioning

confidence: 99%

Non-Invasive Acoustic Monitoring of Gas Turbine Units by Fiber Optic Sensors

Stepanov

Zhirnov

Sazonkin

et al. 2022

Sensors

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“…Therefore, we can describe the working process parameters in SRM as fast-flowing. They include vibrations, pressure in the combustion chamber, and acousto-optical and electrophysical characteristics [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, many tasks can be solved in science and technics with the help of FOSs. They are useful for measuring deformation [ 9 ], temperature [ 10 , 11 , 12 ], vibration [ 13 ], concentration of substances [ 14 ], rotation speed [ 15 ], refractive index [ 16 ], pressure [ 17 ], liquid level [ 18 ], acceleration [ 19 ], acoustics [ 20 , 21 , 22 ], and other parameters [ 2 , 23 , 24 , 25 ]. Additionally, new types of fiber promise to open new opportunities for such monitoring devices [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Study of Intra-Chamber Processes in Solid Rocket Motors by Fiber Optic Sensors

Zhirnov

Stepanov

Sazonkin

et al. 2021

Sensors

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In this study, an experimental study of the burning rate of solid fuel in a model solid propellant rocket motor (SRM) E-5-0 was conducted using a non-invasive control method with fiber-optic sensors (FOSs). Three sensors based on the Mach–Zehnder interferometer (MZI), fixed on the SRM E-5-0, recorded the vibration signal during the entire cycle of solid fuel burning. The results showed that, when using MZI sensors, the non-invasive control of solid fuel burnout is made possible both by recording the time of arrival of the combustion front to the sensor and by analyzing the peaks on the spectrogram of the recorded FOS signal. The main mode of acoustic vibrations of the chamber of the model SRM is longitudinal, and it changes with time, depending on the chamber length. Longitudinal modes of the combustion chamber were detected by MZI only after the combustion front passed its fixing point, and the microphone was unable to register them at all. The results showed that the combustion rate was practically constant after the first second, which was confirmed by the graph of the pressure versus time at the nozzle exit.

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“…A microscope with hyperspectral imaging can use narrow-band radiation of an object, or radiation transmitted through an optical monochromator [7]. Hyperspectral imaging systems based on acousto-optic modulators are known [8]. Most often, hyperspectrometers use an optical scheme of the scanning type, similar to that described in Ref.…”

Section: Introductionmentioning

confidence: 99%