Physical properties of monochromatic light beam

1968 ◽  
Vol 11 (3) ◽  
pp. 78-79
Author(s):  
A. Yu. Ardashev ◽  
V. A. Kashin ◽  
G. V. Skrotskii
Keyword(s):  
Physical Properties ◽  
Light Beam ◽  
Monochromatic Light ◽  
Monochromatic Light Beam

Rotating Ag-Fe3O4-Au Nanograin by Optical Torque with a Monochromatic Light Beam

Plasmonics ◽  
2019 ◽  
Vol 14 (5) ◽  
pp. 1081-1089
Author(s):  
Xiaoqin Mao ◽  
Yan Li ◽  
Weiyan Jiao ◽  
Xinshun Wang ◽  
Benyang Wang
Keyword(s):  
Light Beam ◽  
Monochromatic Light ◽  
Monochromatic Light Beam ◽  
Optical Torque

THE DURATION OF THE 16 VOLT LEVELS OF NEON

1950 ◽  
Vol 28a (3) ◽  
pp. 339-358 ◽  
Author(s):  
Frank A. Grant
Keyword(s):  
Light Beam ◽  
Discharge Tube ◽  
Half Life ◽  
Electrical Discharge ◽  
Monochromatic Light ◽  
Metastable Level ◽  
Electronic Apparatus ◽  
Rate Of Decay ◽  
Monochromatic Light Beam ◽  
Measured Duration

Electronic apparatus has been developed to determine the rate of decay of the 16 volt levels of neon after the interruption of an electrical discharge, by measurement of the absorption of a monochromatic light beam. The half life of the 3P2 metastable level has been determined as a function of pressure and discharge tube diameter. The 3P0 and 3P1 levels exhibit a pronounced departure from an exponential decay. The hypothesis of the imprisonment of resonance radiation is consistent with the measured duration of the 1P1 and 3P1 levels.

Some properties of a narrow monochromatic light beam

1968 ◽  
Vol 11 (12) ◽  
pp. 1047-1049
Author(s):  
A. Yu. Ardashev ◽  
V. A. Kashin ◽  
G. V. Skrotskii
Keyword(s):  
Light Beam ◽  
Monochromatic Light ◽  
Monochromatic Light Beam

Interaction between collinear asymmetric cracks

1972 ◽  
Vol 7 (3) ◽  
pp. 186-193 ◽  
Author(s):  
P S Theocaris
Keyword(s):  
Light Beam ◽  
Monochromatic Light ◽  
Rear Surface ◽  
Thickness Variation ◽  
Shadow Method ◽  
Gas Laser ◽  
Light Rays ◽  
Monochromatic Light Beam ◽  
Neon Gas ◽  
Helium Neon

Thin strips made of perspex and containing two collinear internal cracks of different length were subjected to tension. The thickness variation of the strips was depicted by the reflected-shadow method, in which a coherent monochromatic light beam, emitted from a helium-neon gas laser, was partly reflected from the rear surface of the specimen. The light rays emerging from the plate, which were twice refracted along the thickness and reflected on the rear surface of the plate, were retarded according to Favre's and Neumann's law. The retarded light rays were focused on a caustic surface which depicted the boundary between the constrained area surrounding the crack tip and the remainder of the plate. In this paper two asymmetric collinear internal cracks of different lengths were studied and the interaction between these cracks was evaluated by measuring the variation of the diameter and the distortion of the shape of the caustics for various ratios of crack lengths.

Paper 10: Measurement of an Average Size and Number of Droplets during Spontaneous Condensation of Supersaturated Steam

1969 ◽  
Vol 184 (7) ◽  
pp. 22-28 ◽  
Author(s):  
V. Petr
Keyword(s):  
Droplet Size ◽  
Static Pressure ◽  
Monochromatic Light ◽  
Measuring Error ◽  
Photometric Method ◽  
Intensity Attenuation ◽  
Spontaneous Condensation ◽  
Droplet Sizes ◽  
Monochromatic Light Beam ◽  
Average Size

This paper presents the results of measurements to determine the average size and number of droplets which appear during spontaneous condensation of expanding undercooled steam. The measurements were carried out in a non-symmetric convergent–divergent nozzle for three expansion rates, , of 2000, 5000, and 8000 units per second, and pressure in the Wilson region of 0·4–1·5 bar. The method is based on the measurement of monochromatic light beam intensity attenuation when passing through a layer of wet steam of length l (width of the nozzle) and static pressure variation through the nozzle axis. The photometric method was verified by measuring the droplet sizes in sulphur emulsion. The average size and number of droplets during spontaneous condensation were found to be dependent on the expansion rate and pressure in the Wilson region, and the results of the measurement are in qualitative agreement with those obtained by Gyarmathy. The average droplet size measured by the photometric method is about 25–60 per cent greater than the corresponding values of Gyarmathy. The droplet size measuring error, determined by an approximate analysis, was found to be in the range 15–30 per cent.

Determination of ordinary and extraordinary refractive indices of nematic liquid crystals by using wedge cells

2010 ◽  
Vol 18 (2) ◽  
Author(s):  
J. Kędzierski ◽  
Z. Raszewski ◽  
M. Kojdecki ◽  
E. Kruszelnicki-Nowinowski ◽  
P. Perkowski ◽  
...  
Keyword(s):  
Thin Film ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Monochromatic Light ◽  
Refractive Indices ◽  
Multiple Reflections ◽  
Edge Angle ◽  
Interference Fringes ◽  
Monochromatic Light Beam

AbstractA new accurate and fast interference method for determining ordinary and extraordinary refractive indices of nematic liquid crystals is presented and discussed. The method relies on microscopic measurements of distances between interference fringes appearing in polarised parallel coherent monochromatic light beam transmitted normally to the surfaces through a wedge cell filled with a nematic. Both glass plates confining the cell are coated with a partly transparent thin film of metal which is deposited by evaporation in vacuum. Owing to the multiple reflections between the surfaces and a small edge angle, the interference fringes observed near the wedge apex edge are sharp and equidistant. To apply this method one needs only small amount of an investigated liquid crystal. Basic mathematical formulae and results of an experiment are briefly discussed.

Sign in / Sign up

Export Citation Format

Share Document