scholarly journals Rotman Lens-Fed Fabry-Perot Resonator Antennas for Generating Converged Multi-Mode OAM Beams

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 105768-105775 ◽  
Author(s):  
Xudong Bai ◽  
Anjie Cao ◽  
Fanwei Kong ◽  
Jingyi Qian ◽  
Shengyang Xu ◽  
...  
Keyword(s):  
Fabry Perot ◽  
Multi Mode

Multi-mode all Fiber Interferometer based on Fabry-Perot Multi-cavity and its Temperature Response

Optik ◽  
2017 ◽  
Vol 147 ◽  
pp. 232-239 ◽  
Author(s):  
Y. Lopez-Dieguez ◽  
J.M. Estudillo-Ayala ◽  
D. Jauregui-Vazquez ◽  
J.M. Sierra-Hernandez ◽  
L.A. Herrera-Piad ◽  
...  
Keyword(s):  
Temperature Response ◽  
Fabry Perot ◽  
Multi Mode

Experimental Research of Strain and Temperature Based on EFPI Sensor

2011 ◽  
Vol 130-134 ◽  
pp. 4185-4188
Author(s):  
Xiu Feng Yang ◽  
Chun Yu Zhang ◽  
Zheng Rong Tong
Keyword(s):  
Low Cost ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Good Reliability ◽  
High Repetition ◽  
Sensing Applications ◽  
Fabry Perot ◽  
Wet Chemical ◽  
The Many ◽  
Multi Mode

An extrinsic Fabry-Perot (F-P) interferometric (EFPI) sensor by using simple etching and fusing method is proposed and demonstrated. The cavity is formed by wet chemical etching of multi-mode fiber (MMF) end face in hydrofluoric acid solutions, and then it is fused to the end of a single-mode fiber (SMF) to form an extrinsic F-P structure. The strain and temperature of EFPI sensor are studied experimentally. The experimental results show that the interference wavelength becomes 2.648nm longer while the strain increases from 0N to 637N, and the strain sensitivity is about 0.004nm/N, and linearity is 0.999. The interference wavelength becomes 0.032nm shorter while the temperature increases from 20°C to 100°C. This kind of sensor has the many advantages of easy fabrication, good reliability, high-repetition, small size, low cost and mass-production, which offers great prospect for sensing applications.

A multi-mode extrinsic Fabry - Pérot interferometric strain sensor

1997 ◽  
Vol 6 (4) ◽  
pp. 464-469 ◽  
Author(s):  
T Liu ◽  
D Brooks ◽  
A Martin ◽  
R Badcock ◽  
B Ralph ◽  
...  
Keyword(s):  
Strain Sensor ◽  
Fabry Perot ◽  
Multi Mode

scholarly journals Scorpio On the 6m Telescope: Current State and Perspectives for Spectroscopy of Galactic and Extragalactic Objects

2011 ◽  
Vol 20 (3) ◽  
Author(s):  
V. L. Afanasiev ◽  
A. V. Moiseev
Keyword(s):  
Scientific Data ◽  
Short Description ◽  
Significant Part ◽  
Direct Imaging ◽  
The Past ◽  
Current State ◽  
Fabry Perot ◽  
New Generation ◽  
Multi Mode

AbstractA significant part of observations at the Russian 6 m telescope is carried out using the SCORPIO multi-mode focal reducer. During the past ten years, a lot of scientific data have been collected using observations in the direct imaging, slit spectroscopy and Fabry-Pérot interferometry modes. Some results of these observations are considered in this review. We also present a short description of a new generation instrument named SCORPIO-2.

scholarly journals Quantifying Resolving Power in Astronomical Spectra

2013 ◽  
Vol 30 ◽  
Author(s):  
J. Gordon Robertson
Keyword(s):  
Spectral Line ◽  
Spatial Dimension ◽  
Spectral Lines ◽  
Resolving Power ◽  
Noise Power ◽  
Line Spread Function ◽  
Fabry Perot ◽  
Lorentzian Profile ◽  
Multi Mode ◽  
Line Spread

AbstractThe spectral resolving power R = λ/δλ is a key property of any spectrograph, but its definition is vague because the ‘smallest resolvable wavelength difference’ δλ does not have a consistent definition. Often, the FWHM is used, but this is not consistent when comparing the resolution of instruments with different forms of spectral line-spread function. Here, two methods for calculating resolving power on a consistent scale are given. The first method is based on the principle that two spectral lines are just resolved when the mutual disturbance in fitting the fluxes of the lines reaches a threshold (here equal to that of sinc2 profiles at the Rayleigh criterion). The second criterion assumes that two spectrographs have equal resolving powers if the wavelength error in fitting a narrow spectral line is the same in each case (given equal signal flux and noise power). The two criteria give similar results and give rise to scaling factors that can be applied to bring resolving power calculated using the FWHM on to a consistent scale. The differences among commonly encountered line-spread functions are substantial, with a Lorentzian profile (as produced by an imaging Fabry–Perot interferometer) being a factor of two worse than the boxy profile from a projected circle (as produced by integration across the spatial dimension of a multi-mode fibre) when both have the same FWHM. The projected circle has a larger FWHM than its true resolution, so using FWHM to characterise the resolution of a spectrograph which is fed by multi-mode fibres significantly underestimates its true resolving power if it has small aberrations and a well-sampled profile.

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