Simultaneous Camera, Light Position and Radiant Intensity Distribution Calibration

2016 ◽  
pp. 557-571 ◽  
Author(s):  
Marco Visentini-Scarzanella ◽  
Hiroshi Kawasaki
Keyword(s):  
Intensity Distribution ◽  
Radiant Intensity

Spatial Distribution of Radiant Intensity from Primary Sources for Atomic Absorption Spectrometry. Part I: Hollow Cathode Lamps

1995 ◽  
Vol 49 (4) ◽  
pp. 413-424 ◽  
Author(s):  
Albert Kh. Gilmutdinov ◽  
Bernard Radziuk ◽  
Michael Sperling ◽  
Bernhard Welz ◽  
Konstantin Yu. Nagulin
Keyword(s):  
Spatial Distribution ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Intensity Distribution ◽  
Hollow Cathode ◽  
Imaging System ◽  
Absorption Spectrometry ◽  
Operating Conditions ◽  
Radiant Intensity ◽  
Warm Up

The spatial distribution of radiant intensity from hollow cathode lamps used as radiation sources in atomic absorption spectrometry is investigated with a digital photodiode array imaging system. Intensity distribution over the cross section of each lamp is measured for both atomic and ionic lines of the analyte and the filler gas. The shape of the distribution is strongly dependent on the hollow cathode diameter. In small cathodes the distribution has the shape of a paraboloid with maximum intensity at the hollow cathode axis for all of the recorded lines. The intensity distributions of lines emitted from large cathodes are nonparaboloid and in some cases have a minimum at the cathode axis and a maximum concentric to the cathode walls. It is shown that the intensity distribution for a given lamp has practically the same shape for all currents applied. Data on the evolution of the intensity distribution during warm-up of the lamps and under various operating conditions are presented.

The Relationship of the Radiant Intensity Distribution of Focal Spots to Resolution

Radiology ◽  
1974 ◽  
Vol 111 (2) ◽  
pp. 427-431 ◽  
Author(s):  
Hyman Bernstein ◽  
R. Thomas Bergeron ◽  
David J. Klein
Keyword(s):  
Intensity Distribution ◽  
Radiant Intensity ◽  
Relationship Of ◽  
The Relationship

Design of a uniform irradiance source based on light emitting diodes

2021 ◽  
pp. 147715352110010
Author(s):  
E Rojas Villafañe ◽  
A Valor ◽  
JM de la Rosa ◽  
D Fabila-Bustos ◽  
S Stolik
Keyword(s):  
Intensity Distribution ◽  
Theoretical Calculations ◽  
Light Emitting Diode ◽  
Simulation Method ◽  
Diode Array ◽  
Light Sources ◽  
Uniform Illumination ◽  
Radiant Intensity ◽  
Light Emitting ◽  
Simulation Results

Many applications in various fields require uniform illumination from light sources, for example, in medical imaging in the biophotonics area. In this work, the design and application of an annular light-emitting diode array capable of producing a homogeneous irradiance pattern is presented. As part of the design process, software that allows the simulation of the irradiance pattern as a function of the LED’s radiant intensity distribution, and the position and inclination angle of the LEDs, was developed and validated. Based on the simulation results, a source that produces homogeneous illumination over an area of 20 mm in diameter, where the lowest irradiance is more than 94% of the maximum irradiance, was constructed and tested in real conditions. The simulation method and theoretical calculations on which the array is based can be applied to the design of sources for other applications where a homogeneous irradiance is required.

scholarly journals Angular resolution in VCSEL radiant intensity distribution measurements

2021 ◽  
Vol 18 (3) ◽  
pp. 58-61
Author(s):  
Günther Leschhorn ◽  
Thomas Attenberger ◽  
Tobias Schneider
Keyword(s):  
Intensity Distribution ◽  
Angular Resolution ◽  
Radiant Intensity

Structure images of Si, Ge and Mos2 crystals and some application to radiation damage studies

1978 ◽  
Vol 36 (1) ◽  
pp. 292-293 ◽  
Author(s):  
K. Izui ◽  
T. Nishida ◽  
S. Furuno ◽  
H. Otsu ◽  
S. Kuwabara
Keyword(s):  
Radiation Damage ◽  
Exposure Time ◽  
Gaussian Distribution ◽  
Intensity Distribution ◽  
Chromatic Aberration ◽  
Magnetic Lens

Recently we have observed the structure images of silicon in the (110), (111) and (100) projection respectively, and then examined the optimum defocus and thickness ranges for the formation of such images on the basis of calculations of image contrasts using the n-slice theory. The present paper reports the effects of a chromatic aberration and a slight misorientation on the images, and also presents some applications of structure images of Si, Ge and MoS2 to the radiation damage studies.(1) Effect of a chromatic aberration and slight misorientation: There is an inevitable fluctuation in the amount of defocus due to a chromatic aberration originating from the fluctuations both in the energies of electrons and in the magnetic lens current. The actual image is a results of superposition of those fluctuated images during the exposure time. Assuming the Gaussian distribution for defocus, Δf around the optimum defocus value Δf0, the intensity distribution, I(x,y) in the image formed by this fluctuation is given by

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