scholarly journals On the possibility of using the optical method for express quality control of fruits

2021 ◽  
Vol 2086 (1) ◽  
pp. 012143
Author(s):  
E M Gryaznova ◽  
V V Davydov ◽  
V Y Rud
Keyword(s):  
Quality Control ◽  
Laser Radiation ◽  
Fruit Quality ◽  
Optical Method ◽  
Spatial Coherence ◽  
Experimental Results

Abstract The necessity of express control of fruit quality in various situations has been substantiated. Various methods for the implementation of express control of fruit quality in express mode are considered. A method for express control of fruit quality using laser radiation has been developed. The change in the degree of spatial coherence in the recorded reflected laser radiation from defects on the surfaces of fruits was investigated. Experimental results of the study of various defects on fruits, as well as their hardness and degree of ripening, are presented using the method developed by us.

Review on the Development of Non-Destructive Testing Based on Laser Ultrasonic Technique

2014 ◽  
Author(s):  
Yuanfeng He ◽  
Wenwu Zhang
Keyword(s):  
Quality Control ◽  
Optical Method ◽  
Vibration Signal ◽  
Quality Inspection ◽  
Ultrasonic Technique ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Laser Ultrasonic ◽  
Ultrasonic Technology ◽  
Non Destructive

Development of industry demands better performance of equipments and devices than ever. The property of material used to produce the equipments is the precondition to ensure the quality. As equipments are usually required to be integral during the quality inspection, non-destructive testing (NDT) plays an increasingly import role in modern industry quality control. Different NDT methods are introduced and analyzed. The mechanism of ultrasonic exciting is described. After the ultrasonic is excited, the vibration signal can be detected by transducer or optical method which are then illustrated. In the section of development of laser ultrasonic technology, contributions made by various researchers in theoretic development, experiment, simulation and application are introduced and the corresponding content of the researches as well. The conclusion and the outlook of laser ultrasonic technique is made at the last.

Mutual effects of temporal and spatial coherence of laser radiation during wind refraction

1989 ◽  
Vol 32 (7) ◽  
pp. 606-611
Author(s):  
V. A. Aleshkevich ◽  
G. D. Kozhoridze ◽  
A. N. Matveev
Keyword(s):  
Laser Radiation ◽  
Spatial Coherence ◽  
Temporal And Spatial

Extraordinary Coherent Thermal Emission From SiC Due to Coupled Resonant Cavities

2008 ◽  
Vol 130 (11) ◽  
Author(s):  
Nir Dahan ◽  
Avi Niv ◽  
Gabriel Biener ◽  
Yuri Gorodetski ◽  
Vladimir Kleiner ◽  
...  
Keyword(s):  
Quality Factor ◽  
Coherence Length ◽  
Thermal Emission ◽  
Spatial Coherence ◽  
Optical Filters ◽  
High Quality Factor ◽  
Experimental Results ◽  
Thermal Source ◽  
High Quality ◽  
Resonant Cavities

In high temperature and vacuum applications, when heat transfer is predominantly by radiation, the material’s surface texture is of substantial importance. Several micro- and nanostructure designs have been proposed to enhance a material’s emissivity and its radiative coherence, as control of thermal emission is of crucial concern in the design of infrared sources, optical filters, and sensing devices. In this research, an extraordinary coherent thermal emission from an anisotropic microstructure is experimentally and theoretically presented. The enhanced coherency is due to coherent coupling between resonant cavities obtained by surface standing waves, wherein each cavity supports a localized field that is attributed to coupled surface phonon polaritons. We show that it is possible to obtain a polarized quasimonochromatic thermal source from a SiC microstructure with a high quality factor of 600 at the resonant frequency of the cavity and a spatial coherence length of 716 wavelengths, which corresponds to an angular divergence of 1.4mrad. In the experimental results, we measured a quality factor of 200 and a spatial coherence length of 143 wavelengths. We attribute the deviation in the experimental results to imperfections in the fabrication of the high quality factor cavities.

Angular divergence and spatial coherence of X-ray laser radiation

1998 ◽  
Vol 41 (8) ◽  
pp. 761-792 ◽  
Author(s):  
P D Gasparyan ◽  
F A Starikov ◽  
Andrei N Starostin
Keyword(s):  
Laser Radiation ◽  
Spatial Coherence ◽  
Angular Divergence ◽  
X Ray

scholarly journals DYNAMICS OF VIBRA AMICS OF VIBRATIONAL MOTION OF THE DOM TION OF THE DOMAIN BORDER AIN BORDER IN THE FERRITE GRADE OF Tb3Fe5O12

2019 ◽  
Vol 3 (3) ◽  
pp. 6-10
Author(s):  
Davron Rakhmonovich Dzhuraev ◽  
◽  
Mirzo Zokirovich Sharipov ◽  
Dilshod Ergashovich Khaitov ◽  
Nilufar Mansurovna Ergasheva
Keyword(s):  
Theoretical Model ◽  
Magnetic Resonance ◽  
Resonance Frequency ◽  
Optical Method ◽  
Oscillatory Motion ◽  
Experimental Results ◽  
Compensation Point ◽  
Vibrational Motion ◽  
Magnetic Compensation ◽  
Domain Boundaries

The magneto-optical method is used to study the dynamics of the oscillatory motion of domain boundaries in a Tb3Fe5O12 garnet ferrite in the temperature range 200-295K, including the magnetic compensation point of this ferrimagnet Fs ≈ 249K. To interpret the experimental results obtained, a theoretical model of magnetic resonance of domain boundaries is proposed, according to which when the temperature approaches the compensation point, the mass of the domain boundaries tends to infinity, and the resonance frequency tends to zero

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