scholarly journals A mini-spectrometre for the on-orbit control of optical window ageing on the ISS

2017 ◽  
Author(s):  
António Araújo ◽  
Marc van Eesbeek ◽  
Magdeleine Dinguirard
Keyword(s):  
Optical Window ◽  
Orbit Control

EVALUATION OF THE RELIABILITY OF COMPLEX TECHNICAL RECONFIGURATION SYSTEMS BY STATISTICAL MODELING METHOD

2019 ◽  
pp. 84-88
Author(s):  
A.Yu. Kulakov
Keyword(s):  
Normal Distribution ◽  
Statistical Modeling ◽  
Quantitative Estimate ◽  
Failure Time ◽  
Modeling Method ◽  
System Failure ◽  
Similar System ◽  
Orbit Control ◽  
Reliability Characteristics ◽  
Complex Technical System

Goal. Assess the reliability of a complex technical system with periodic reconfiguration and compare the results obtained a similar system, but without reconfiguration. Materials and methods. In this article uses the method of statistical modeling (Monte Carlo) to assess the reliability of complex system. We using the normal and exponential distribution of failure time for modeling failures of system elements. Reconfiguration algorithm is the algorithm proposed for the attitude and orbit control system of spacecraft. Results. A computer program has been developed for assessing reliability on the basis of a statistical modeling method, which makes it possible to evaluate systems of varying complexity with exponential and normal distribution, as well as with and without periodic reconfiguration. A quantitative estimate of the reliability as a function of the probability of system failure is obtained. Conclusion. It has been demonstrated that a system with reconfiguration has the best reliability characteristics, both in the case of exponential and normal distribution of failures.

scholarly journals Improvement of an InfraRed Pyroelectric Detector Performances in THz Range Using the Terajet Effect

2021 ◽  
Vol 11 (15) ◽  
pp. 7011
Author(s):  
Oleg V. Minin ◽  
Jaime Calvo-Gallego ◽  
Yahya M. Meziani ◽  
Igor V. Minin
Keyword(s):  
Internal Structure ◽  
Diffraction Limit ◽  
Noise Equivalent Power ◽  
Pyroelectric Detector ◽  
Optical Window ◽  
Ir Sensors ◽  
Thz Detection ◽  
Thz Range ◽  
Thz Applications

An infrared (IR) pyroelectric detector was investigated for terahertz (THz) detection using the principle of the terajet effect, which focuses the beam beyond the diffraction limit. The terahertz beam was coupled to the detector’s optical window through a two-wavelength-dimension dielectric cubic particle-lens based on the terajet effect. We experimentally demonstrate an enhancement of about 6 dB in the sensitivity under excitation of 0.2 THz without degradation of the noise equivalent power value. The results show that the proposed method could be applied to increase the sensitivity of various commercial IR sensors for THz applications that do not require modification of the internal structure, and it may apply also to acoustics and plasmonic detectors.

scholarly journals Optical study to identify and quantify capsaicin in optical window

Heliyon ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. e05797
Author(s):  
Manuel Abraham López Pacheco ◽  
José Javier Báez Rojas ◽  
Jorge Castro-Ramos ◽  
José Fabian Villa Manríquez ◽  
Karen Esmonde-White
Keyword(s):  
Optical Study ◽  
Optical Window

Attitude and Orbit Control Subsystem For MOS-1

1989 ◽  
Vol 22 (7) ◽  
pp. 75-80 ◽  
Author(s):  
T. Matsueda ◽  
T. Shimoda ◽  
K. Okada ◽  
T. Yamaguchi ◽  
H. Kato
Keyword(s):  
Control Subsystem ◽  
Orbit Control
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