Courbes de visibilité du spectre cannelé

1970 ◽  
Vol 48 (18) ◽  
pp. 2112-2117 ◽  
Author(s):  
Jean-Marie St-Arnaud ◽  
Claude Delisle
Keyword(s):  
Spectral Density ◽  
White Light ◽  
Michelson Interferometer ◽  
Path Difference ◽  
Experimental Results ◽  
Parallel Beam ◽  
Density Modulation

A Michelson interferometer is illuminated by a parallel beam of white light. The visibility of the channelled spectrum or spectral density modulation at the exit of the interferometer is measured as a function of the path difference between the two beams formed in the interferometer. The experimental results show that the contrast has not completely disappeared for a path difference much larger than that already reported in the literature.

Etude de l'Effet des Paramètres d'Appareil sur la Décroissance de la Visibilité du Spectre Cannelé

1971 ◽  
Vol 49 (17) ◽  
pp. 2237-2249 ◽  
Author(s):  
C. Delisle ◽  
M. Brochu ◽  
J. M. St-Arnaud
Keyword(s):  
Spectral Density ◽  
White Light ◽  
Michelson Interferometer ◽  
Finite Size ◽  
Path Difference ◽  
Parallel Beam ◽  
Density Modulation ◽  
Theory And Experiment

The visibility of the channelled spectrum, or in other words the visibility of the spectral density modulation at the exit of a Michelson interferometer illuminated with a parallel beam of white light, is theoretically independent of the frequency and path difference of the two beams formed in the interferometer. Up to now there has been no agreement between theory and experiment. It is shown here, theoretically and experimentally, that the decrease in visibility with increasing path difference is related to both the finite size of the slits and the limit of resolution of the apparatus.

The Influence of Surface Texture on Abrasive Wear

2019 ◽  
Vol 823 ◽  
pp. 33-40 ◽  
Author(s):  
Yu Tong Hu ◽  
Yong Yong He ◽  
Wei Wang
Keyword(s):  
Friction Coefficient ◽  
Femtosecond Laser ◽  
Abrasive Wear ◽  
White Light ◽  
Surface Texture ◽  
Friction Surface ◽  
Surface Texturing ◽  
Experimental Results ◽  
The Relationship ◽  
Main Factor

Friction happens everywhere. Abrasives generated in tribological process will result in secondary wear. Abrasive wear is a kind of rather common but harmful wear, which is the main reason for the damage of fifty-percent mechanical components by friction. Surface texturing is an effective method to improve the tribological and lubricating performance of tribo-pairs. In this paper, with different-size diamond particles added into the lubricant and a surface of the tribo-pairs textured by different parameters (diameter and depth) with femtosecond laser, the relationship between the surface texture and the abrasive wear was researched, and the influence of the texture on the abrasive wear was analyzed. The friction experiments were carried out on UMT3. The microstructures were tested and analyzed by SEM, microscope and White Light Interferometer respectively. The experimental results showed that the size of the surface texture, compared with that of abrasives, is the main factor which determines the friction coefficient. As the size of the surface texture is much bigger than that of the abrasives, the texture can accommodate the abrasives efficiently, and thus the friction coefficient is reduced efficiently.

scholarly journals Development of a Compact Three-Degree-of-Freedom Laser Measurement System with Self-Wavelength Correction for Displacement Feedback of a Nanopositioning Stage

2018 ◽  
Vol 8 (11) ◽  
pp. 2209 ◽  
Author(s):  
Yindi Cai ◽  
Zhifeng Lou ◽  
Siying Ling ◽  
Bo-syun Liao ◽  
Kuang-chao Fan
Keyword(s):  
Laser Diode ◽  
Low Cost ◽  
Michelson Interferometer ◽  
Optical Path Difference ◽  
Path Difference ◽  
Degree Of Freedom ◽  
Laser Source ◽  
Laser Measurement ◽  
Length Unit ◽  
Three Degree Of Freedom

This paper presents a miniature three-degree-of-freedom laser measurement (3DOFLM) system for displacement feedback and error compensation of a nanopositioning stage. The 3DOFLM system is composed of a miniature Michelson interferometer (MMI) kit, a wavelength corrector kit, and a miniature autocollimator kit. A low-cost laser diode is employed as the laser source. The motion of the stage can cause an optical path difference in the MMI kit so as to produce interference fringes. The interference signals with a phase interval of 90° due to the phase control are detected by four photodetectors. The wavelength corrector kit, based on the grating diffraction principle and the autocollimation principle, provides real-time correction of the laser diode wavelength, which is the length unit of the MMI kit. The miniature autocollimator kit based on the autocollimation principle is employed to measure angular errors and compensate induced Abbe error of the moving table. The developed 3DOFLM system was constructed with dimensions of 80 mm (x) × 90 mm (y) × 20 mm (z) so that it could be embedded into the nanopositioning stage. A series of calibration and comparison experiments were carried out to test the performance of this system.

scholarly journals Color Temperature Tunable White-Light LED Cluster with Extrahigh Color Rendering Index

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Minhao Zhang ◽  
Yu Chen ◽  
Guoxing He
Keyword(s):  
White Light ◽  
Experimental Results ◽  
Color Temperature ◽  
Blue Led ◽  
Average Value ◽  
Red Led ◽  
Green Led ◽  
Color Rendering Index ◽  
Color Rendering

The correlated color temperature (CCT) tunable white-light LED cluster with extrahigh color rendering property has been found by simulation and fabricated, which consists of three WW LEDs (CCT = 3183 K), one red LED (634.1 nm), one green LED (513.9 nm), and one blue LED (456.2 nm). The experimental results show that this cluster can realize the CCT tunable white-lights with a color rendering index (CRI) above 93, special CRI R9 for strong red above 90, average value of the special CRIs of R9 to R12 for the four saturated colors (red, yellow, green, and blue) above 83, and luminous efficacies above 70 lm/W at CCTs of 2719 K to 6497 K.

Multimode interference and a white light scanning Michelson interferometer with a 400-mm sapphire fiber sensing head

1998 ◽  
Author(s):  
Tianchu Li ◽  
Russell G. May ◽  
Anbo Wang ◽  
Richard O. Claus
Keyword(s):  
White Light ◽  
Michelson Interferometer ◽  
Multimode Interference ◽  
Fiber Sensing ◽  
Sapphire Fiber

Ultrabroadband infrared chirped mirrors characterized by a white-light Michelson interferometer

2015 ◽  
Vol 119 (2) ◽  
pp. 347-353 ◽  
Author(s):  
Keisuke Kaneshima ◽  
Muneo Sugiura ◽  
Koichi Tamura ◽  
Nobuhisa Ishii ◽  
Jiro Itatani
Keyword(s):  
White Light ◽  
Michelson Interferometer

scholarly journals Interférométrie et réflectométrie haute résolution en lumière incohérente : modélisation d'interférogrammes

2000 ◽  
Vol 77 (9) ◽  
pp. 685-692
Author(s):  
C Lupi ◽  
E Tanguy ◽  
C Boisrobert ◽  
F de Fornel
Keyword(s):  
Optical Properties ◽  
Spatial Resolution ◽  
White Light ◽  
Near Infrared ◽  
Michelson Interferometer ◽  
Optical Power ◽  
Source Spectrum ◽  
Optical Fibres ◽  
Low Coherence ◽  
Haute Résolution

We report on low-coherence, near-infrared reflectometry applied to optical fibres, waveguides, and coupling devices to detect the echoes due to reflective propagation defects and measure their optical properties — losses or attenuation, dispersion. This technique, based on interferometry, leads to the highest spatial resolution and the lowest detectable reflected optical power. We scan the reference arm of our Michelson interferometer around the ``white light fringe'' position and obtain interferograms whose envelopes and fringes contain information on the light source spectrum and the reflectivity of the test arm. Theoretical and experimental results are compared. Examples are given and show that numerical simulations are needed to understand the signatures of the reflectors and get to their physical structures.

Fast, accurate measurement of path difference with white light

2003 ◽  
Vol 50 (18) ◽  
pp. 2781-2790 ◽  
Author(s):  
A. R. D. Somervell ◽  
T. H. Barnes
Keyword(s):  
White Light ◽  
Path Difference
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