USE OF CARBON NANOTUBES FOR EQUALIZATION OF TEMPERATURE FIELDS IN FIBER OPTIC GYROSCOPES

2019 ◽  
Author(s):  
Alexey Golikov
Keyword(s):  
Carbon Nanotubes ◽  
Fiber Optic ◽  
Temperature Fields

Carbon nanotubes coated fiber optic ammonia gas sensor

2011 ◽  
Author(s):  
S. Manivannan ◽  
L. R. Shobin ◽  
A. M. Saranya ◽  
B. Renganathan ◽  
D. Sastikumar ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Fiber Optic ◽  
Ammonia Gas ◽  
Coated Fiber

scholarly journals Entropy Generation of Carbon Nanotubes Flow in a Rotating Channel with Hall and Ion-Slip Effect Using Effective Thermal Conductivity Model

Entropy ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 52 ◽  
Author(s):  
Nosheen Feroz ◽  
Zahir Shah ◽  
Saeed Islam ◽  
Ebraheem Alzahrani ◽  
Waris Khan
Keyword(s):  
Carbon Nanotubes ◽  
Differential Equations ◽  
Entropy Generation ◽  
Multiwall Carbon Nanotubes ◽  
Temperature Fields ◽  
Physical Parameters ◽  
Slip Effect ◽  
Parallel Plates ◽  
Nanofluid Flow ◽  
Ion Slip

This article examines the entropy analysis of magnetohydrodynamic (MHD) nanofluid flow of single and multiwall carbon nanotubes between two rotating parallel plates. The nanofluid flow is taken under the existence of Hall current and ion-slip effect. Carbon nanotubes (CNTs) are highly proficient heat transmission agents with bordering entropy generation and, thus, are considered to be a capable cooling medium. Entropy generation and Hall effect are mainly focused upon in this work. Using the appropriate similarity transformation, the central partial differential equations are changed to a system of ordinary differential equations, and an optimal approach is used for solution purposes. The resultant non-dimensional physical parameter appear in the velocity and temperature fields discussed using graphs. Also, the effect of skin fraction coefficient and Nusselt number of enclosed physical parameters are discussed using tables. It is observed that increased values of magnetic and ion-slip parameters reduce the velocity of the nanofluids and increase entropy generation. The results reveal that considering higher magnetic forces results in greater conduction mechanism.

scholarly journals Fiber Optic Chemical Nanosensors Based on Engineered Single-Walled Carbon Nanotubes

2008 ◽  
Vol 2008 ◽  
pp. 1-29 ◽  
Author(s):  
M. Consales ◽  
A. Cutolo ◽  
M. Penza ◽  
P. Aversa ◽  
M. Giordano ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Fiber Surface ◽  
Single Walled Carbon Nanotubes ◽  
Operating Conditions ◽  
Single Walled Carbon ◽  
Sensing Applications ◽  
Fiber Technology ◽  
Walled Carbon Nanotubes

In this contribution, a review of the development of high-performance optochemical nanosensors based on the integration of carbon nanotubes with the optical fiber technology is presented. The paper first provide an overview of the amazing features of carbon nanotubes and their exploitation as highly adsorbent nanoscale materials for gas sensing applications. Successively, the attention is focused on the operating principle, fabrication, and characterization of fiber optic chemosensors in the Fabry-Perot type reflectometric configuration, realized by means of the deposition of a thin layer of single-walled carbon nanotubes (SWCNTs) upon the distal end of standard silica optical fibers. This is followed by an extensive review of the excellent sensing capabilities of the realized SWCNTs-based chemical nanosensors against volatile organic compounds and other pollutants in different environments (air and water) and operating conditions (room temperature and cryogenic temperatures). The experimental results reported here reveal that ppm and sub-ppm chemical detection limits, low response times, as well as fast and complete recovery of the sensor responses have been obtained in most of the investigated cases. This evidences the great potentialities of the proposed photonic nanosensors based on SWCNTs to be successfully employed for practical environmental monitoring applications both in liquid and vapor phase as well as for space. Furthermore, the use of novel SWCNTs-based composites as sensitive fiber coatings is proposed to enhance the sensing performance and to improve the adhesion of carbon nanotubes to the fiber surface. Finally, new advanced sensing configurations based on the use of hollow-core optical fibers coated and partially filled by carbon nanotubes are also presented.

scholarly journals Problem statement for practical modeling of temperature fields of gyroscopes in space navigation systems

2020 ◽  
Vol 224 ◽  
pp. 02006
Author(s):  
V M Pankratov ◽  
A V Golikov ◽  
M. A. Barulina ◽  
E V Pankratova ◽  
M V Efremov
Keyword(s):  
Fiber Optic ◽  
Three Dimensional ◽  
Research Problem ◽  
Temperature Fields ◽  
Design Stage ◽  
Navigation Systems ◽  
Fiber Optic Gyroscope ◽  
Financial Investment ◽  
Space Navigation ◽  
Space Navigation Systems

The paper describes a method of studying temperature fields in fiber-optic gyroscopes that are part of complex navigation systems, using the example fiber-optic gyroscope as part of the angular velocity measurement system BIUS-M-1, developed by “Antares” (Saratov). The work relevance is due to the fact that currently existing methods for studying external and internal thermal effects on precision devices, and the resulting three-dimensional non-stationary temperature fields may be too complicated for practical application, or require significant computation and time resource. Also, not all contemporary models take into account such parameters, as low pressure and vacuum, the importance of which for devices operating in space orbital conditions cannot be underestimated. Therefore, modeling of the thermal process in various devices should be carried out at the design stage. At the same time, such modeling should not be labor-intensive, do not require large financial investment and computing resources. In this paper, the authors formulate a research problem, develop a thermal model, and present the main relations that are the components of the mathematical model of nonstationary three-dimensional inhomogeneous temperature fields in the fiber-optic gyroscope. The resulting model can be implemented quite simply in computational algorithms and software.

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