The method of light flux calculation in optical fiber with side emission

2007 ◽  
Author(s):  
Maciej Zajkowski
Keyword(s):  
Optical Fiber ◽  
Light Flux ◽  
Flux Calculation ◽  
Side Emission

scholarly journals Dynamic model of control of vibration damping mode by fiber optic PEL-sensor with phase shifting of control electric voltage.

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
A.A. Pan'kov ◽  
Keyword(s):  
Optical Fiber ◽  
Dynamic Model ◽  
Electrical Impedance ◽  
Coherent Control ◽  
Mechanical Energy ◽  
Light Flux ◽  
Electric Circuit ◽  
Phase Shifting ◽  
Frequency Range ◽  
Electric Voltage

A mathematical dynamic model of the operation of the vibration pressure optical fiber piezoelectroluminescent (PEL) sensor in the damping mode was developed taking into account the electrical conductivities and Maxwell-Wagnerian relaxation of electric fields in the phases for the case of harmonic stress (vibration pressure) on the external cylindrical surface of the sensor. Analytical solution of damping of stationary axisymmetric oscillations of optical fiber PEL-sensor is obtained and investigated by applying coherent control electric voltage to electrodes of sensor with phase shifting relative to vibration pressure. Regularities of frequency dependencies for real, imaginary parts of control, informative transfer and damping coefficients of sensor are established and studied. Analysis of influence of value and shift angle of phases of control electric voltage on results of numerical simulation for intensity of light flux at output from optical fiber of sensor under action of vibration pressure is performed. Frequency dependencies were found for the electrical impedance of the AC electric circuit of the sensor in comparison with the approximation of these dependencies by electromechanical analogy. It was revealed that in the frequency range under consideration, the electrical impedance of the sensor with satisfactory accuracy is based on consideration of an equivalent electric circuit with parallel connection of frequency-dependent active and capacitive elements. Frequency range and values of control parameters are set for effective active damping of vibration pressure through conversion to Joule heat (dissipation) of mechanical energy supplied to the sensor. The results of comparing the analytical and numerical (in the ANSYS package) approaches confirm the validity and adequacy of the decisions obtained.

Star Simulator Base on Multiple LEDs, Optical Fiber and Integral Sphere

2014 ◽  
Vol 672-674 ◽  
pp. 2048-2051
Author(s):  
Xin Ji Gan ◽  
Yan Chen
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Optical System ◽  
Block Diagram ◽  
Compact Star ◽  
Luminous Flux ◽  
Optical Systems ◽  
Pwm Control ◽  
System Configuration ◽  
Flux Calculation

In order to design a compact star simulator based on multiple LEDs, optical fibers, an integral sphere and tiny collimated optical systems are employed in the system. Firstly the system configuration block diagram of the star simulator is given in this paper. Then the luminous flux calculation of LED is calculated based on the optical system. Finally the principle of PWM control of LED is illustrated. The analysis shows that the simulated precision of star magnitude can achieve ±0.1m.

scholarly journals Electro-mechanical model of indicator polymer fiber-optic PEL-coating for diagnosing mechanical effects.

2021 ◽  
Author(s):  
A.A. Pan’kov ◽  
Keyword(s):  
Optical Fiber ◽  
Light Flux ◽  
Mechanical Effect ◽  
Polymer Fiber ◽  
Mechanical Effects ◽  
Flux Intensity ◽  
Characteristic Points ◽  
Informative Characteristic ◽  
Indicator Coating ◽  
Static Pressing

A mathematical model of the functioning of the indicator polymer piezoelectroluminescent (PEL) coating for diagnosing external mechanical effects - quasi-static pressing of rigid ball particles has been developed. The algorithm of numerical processing of informative intensity of light flux at the output from optical fiber built into indicator coating of optical fiber PEL-sensor is presented. A numerical analysis for the case of single mechanical effect revealed the regularities of influence of the values of the sensor spiral pitch on the informative parts of the resulting spectra of light flux intensity and pressure distribution along the length of the sensor spiral. Informative characteristic points of pressure spectra plots were revealed; these are points of maxima, abscissa and values of which make it possible to find the desired values of radius and pressing force of a rigid ball particle.

Evanescent wave interaction with nanoparticles on optical fiber modulate side emission of germicidal ultraviolet light

2021 ◽  
Author(s):  
Zhe Zhao ◽  
Mariana Lopes ◽  
Emma Westerhoff ◽  
Xiangxing Long ◽  
Ho Jung Rho ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Ultraviolet Light ◽  
Evanescent Wave ◽  
Wave Interaction ◽  
Silica Nanoparticle ◽  
Nanoparticle Coating ◽  
Quartz Optical Fiber ◽  
Side Emission ◽  
Uv C

Silica nanoparticle coating on quartz optical fiber facilitates side-emission of germicidal ultraviolet light (UV-C), which shows promise for disinfection of contaminated air, water, and surfaces. However, the emitted light along...

Bending loss formulas for step-index optical fiber and their applicable regions

1981 ◽  
Vol 64 (10) ◽  
pp. 95-103
Author(s):  
Kiyonobu Kusano ◽  
Shigeo Nishida
Keyword(s):  
Optical Fiber ◽  
Step Index ◽  
Bending Loss

Modeling of photosynthesis light curves by linear splines

2019 ◽  
pp. 20-29
Author(s):  
Alexander S. Lelekov ◽  
Rudolf P. Trenkenshu
Keyword(s):  
Experimental Data ◽  
Chlorophyll A ◽  
Skeletonema Costatum ◽  
Light Flux ◽  
Photosynthesis Rate ◽  
Light Curves ◽  
External Irradiation ◽  
Exchange Reactions ◽  
Cell Adaptation ◽  
Linear Splines

The paper presents an example of the linear splines use to describe the photosynthesis light curves for microalgae culture. The main mathematical models of the relationship between photosynthesis rate and light are listed. Based on the previously formulated basic principles of modeling microalgae photobiosynthesis, a mathematical model is proposed that describes the dependence of the assimilation number of chlorophyll a on the value of the light flux by linear splines. The advantage of the proposed approach is a clear definition of the point of change of the limiting factor. It is shown that light-limited photosynthesis rate is determined not only by external irradiation, but also by the concentration of chlorophyll a. The light-saturated rate depends on the amount of a key enzyme complex, which limits the rate of energy exchange reactions in the cell. Verification of the proposed model on the example of the diatom microalgae Skeletonema costatum was carried out. It is shown that the higher the degree of cell adaptation to high irradiation, the better the photosynthesis curve is described by linear splines. If S. costatum cells are adapted to low irradiation, deviations of experimental data from the idealized broken line are observed, which are caused by changes in the pigment composition. When the experimental data are normalized, the cell adaptation factor is reduced, all points are described by a single broken line, which indicates the universality of the proposed approach.

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