An experimental study of light intensity fluctuation in a turbulent atmosphere

1973 ◽  
Vol 16 (6) ◽  
pp. 852-853
Author(s):  
S. S. Khmelevtsov ◽  
R. Sh. Tsvyk
Keyword(s):  
Experimental Study ◽  
Light Intensity ◽  
Turbulent Atmosphere ◽  
Intensity Fluctuation

Light intensity and spatial coherence characteristics of laser coherent detection in a turbulent atmosphere

2020 ◽  
Vol 13 (4) ◽  
pp. 728-736
Author(s):  
REN Jian-ying ◽  
◽  
◽  
SUN Hua-yan ◽  
ZHAO Yan-zhong ◽  
...  
Keyword(s):  
Light Intensity ◽  
Turbulent Atmosphere ◽  
Spatial Coherence ◽  
Coherent Detection

Experimental Study on Angle-resolved Light Intensity Scattered Profile and Roughness Exponent of Self-affine Fractal Surface

2009 ◽  
Vol 29 (8) ◽  
pp. 2208-2215
Author(s):  
张宁玉 Zhang Ningyu ◽  
程传福 Cheng Chuanfu ◽  
张俊超 Zhang Junchao ◽  
滕树云 Teng Shuyun
Keyword(s):  
Experimental Study ◽  
Light Intensity ◽  
Fractal Surface ◽  
Roughness Exponent

Suppression of laser intensity fluctuation in resonator optical gyro by a simple light intensity feedback technique

2020 ◽  
Vol 59 (03) ◽  
pp. 1
Author(s):  
Shihao Yin ◽  
Wenyao Liu ◽  
Enbo Xing ◽  
Ziwen Pan ◽  
Yu Tao ◽  
...  
Keyword(s):  
Light Intensity ◽  
Intensity Fluctuation ◽  
Laser Intensity

An experimental study of Phototactic responses of Tanytarsus barbitarsis Freeman (Diptera: Chironomidae

1989 ◽  
Vol 40 (6) ◽  
pp. 693 ◽  
Author(s):  
MJ Kokkinn ◽  
WD Williams
Keyword(s):  
Experimental Study ◽  
Light Intensity ◽  
South Australia ◽  
Salt Lakes ◽  
Near Ultraviolet ◽  
Large Numbers ◽  
Local Residents ◽  
Do So

A series of salt lakes near Port Augusta, South Australia, supports large larval populations of Tanytarsus barbitarsis Freeman, a chironomid midge. When adults emerge they often fly to nearby artificial lights, and when large numbers do so a considerable nuisance to local residents is caused. In an investigation designed to provide control advice, those parts of the spectrum of particular attractivity to adults were identified in an experimental study of phototactic responses. Results indicated that the peak of attractivity lies in the near-ultraviolet part of the spectrum (370-400 nm). A second, weaker peak lies between 490 and 510 nm. Light intensity does not appear to be important. Certain sorts of commercially available lamps emit light with peaks in those parts of the spectrum attractive to T. barbitarsis and may be suitable for control purposes.

Experimental Study on Light Intensity Profile in an Axisymmetric Thin Shell Irradiated by a Light

2013 ◽  
Vol 740 ◽  
pp. 640-643
Author(s):  
Ching Yen Ho ◽  
C. Ma
Keyword(s):  
Experimental Study ◽  
Solar Energy ◽  
Light Intensity ◽  
Intensity Distribution ◽  
Thin Shell ◽  
Laser Light ◽  
Laser Drilling ◽  
Geometric Optics ◽  
Light Intensity Distribution ◽  
Novel Method

This paper experimentally investigates light intensity distribution in a paraboloid of thin shell irradiated by a laser. Light intensity distribution needs to be understood for solar energy heat receiver or laser drilling cavity. A novel method is utilized to measure the light intensity distribution in a paraboloid of thin shell irradiated by a laser. The results are explained by simple geometric optics.

Characterization Of Pathological Skin Sample By Polarimetric Technique

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Anil Gupta ◽  
C LP Gupta ◽  
Purnima Bharti ◽  
Devash Kumar
Keyword(s):  
Experimental Study ◽  
Optical Properties ◽  
Light Intensity ◽  
Physical Properties ◽  
Biological Tissue ◽  
Incident Light ◽  
Polarization State ◽  
Skin Sample ◽  
Skin Changes

Measurement of optical properties of skin is an expanding and growing field of research. Recent studies have shown that the biological tissue, especially skin changes the polarization state of the incident light. Using this property will enable the study of abnormalities and diseases that alter not only the light intensity but also its polarization state. We have tried an experimental study for measuring changes of polarization state of the light scattered from skin sample. Using the strokes vector and Mueller matrix notation we have shown that some elements of matrix were sensitive to the changes of the polarization when physical properties of the scatters are changed with sample.

Scattered light intensity fluctuation in the canine ventricular myocardium: correlation with inotropic drug effect

1988 ◽  
Vol 66 (9) ◽  
pp. 1232-1238 ◽  
Author(s):  
D. Bose ◽  
T. Kobayashi ◽  
R. A. Bouchard ◽  
L. V. Hryshko
Keyword(s):  
Sarcoplasmic Reticulum ◽  
Light Intensity ◽  
Intensity Fluctuation ◽  
Scattered Light ◽  
Ventricular Myocardium ◽  
Bay K 8644 ◽  
Scattered Light Intensity ◽  
Ca Channel ◽  
Inotropic Agents ◽  
Inotropic Response

Scattered light intensity fluctuation (SLIF) of coherent light by a strip of ventricular muscle during diastole is believed to be due to asynchronous cellular motion within the myocyte as a result of spontaneous release of Ca from the sarcoplasmic reticulum. Previous studies have shown a correlation between inotropic agents, such as ouabain and elevated extracellular Ca or decreased extracellular Na, and SLIF. The purpose of this study was to see if this correlation could be extended to other inotropic agents. The digitalis genin, ouabagenin, produces inotropy by increasing intracellular free Ca. In toxic concentrations the drug produces abnormal aftercontractions by spontaneous Ca release from the sarcoplasmic reticulum. On the other hand, the Ca channel agonist BAY k 8644 is also positively inotropic, but its effect is associated with a decrease in Ca release from the sarcoplasmic reticulum, manifested by conversion of "rest potentiation" to "rest depression." The effects of these inotropic agents on the power spectra of SLIF were dissimilar. Both frequency and amplitude of SLIF were increased after ouabagenin (1 μM), but these changes were most marked after the onset of toxicity, at which time contractility was decreased, rather than during the positive inotropic response. In contrast, BAY k 8644 (1 μM) decreased SLIF at all levels of inotropic response. The β-adrenoceptor stimulant drug, dobutamine, and the adenylate cyclase activator, forskolin, produced minimal increase in SLIF at inotropic concentrations but caused a large increase in SLIF only after the onset of toxicity. These results suggest that SLIF is a better indicator of intracellular Ca overload and toxic oscillatory contractions in the presence of an inotrope and not of increased inotropy, per se.

scholarly journals Light Flicker Frequencies in the HID lamps

2017 ◽  
Vol 2 (2) ◽  
pp. 96-101
Author(s):  
Lakhdar Amer ◽  
Messaoud Hamouda ◽  
Chellali Benachiba
Keyword(s):  
Applied Sciences ◽  
Light Intensity ◽  
Intensity Fluctuation ◽  
Great Part ◽  
Low Frequency ◽  
High Frequencies ◽  
University Of Applied Sciences ◽  
Low Costs ◽  
Light Flicker ◽  
Hid Lamps

In order to reduce the electric consumption for high intensity discharge lamps (HID), the use of high frequencies electronic ballasts represents both a solution and many advantages such as, the decrease in the congestion, low costs and weak losses, approximately 10%. However it is not regarded as perfectly reliable, this is due in a great part to the appearance of Acoustic Resonances inside the arc tube which can result in low frequency light flicker and even lamp destruction. Experimentally we used a HID lamp of 50 W and we determined, light flicker frequencies and the arc motion frequencies using a photodiode which detects the light intensity fluctuation and a camera to record the arc motion. The experiment was done in the Department of Mechanical Engineering and Production, Hamburg University of Applied Sciences.

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