A FABRY-PEROT SPECTROMETER FOR AURORAL AND AIRGLOW OBSERVATIONS

1960 ◽  
Vol 38 (12) ◽  
pp. 1560-1569 ◽  
Author(s):  
G. G. Shepherd
Keyword(s):  
Preliminary Results ◽  
Grating Spectrometer ◽  
Light Gathering Power ◽  
Fabry Perot ◽  
Light Gathering ◽  
Mechanical Scanning ◽  
Low Order

A 1-in. Fabry-Perot interferometric spectrometer employing mechanical scanning has been constructed to operate at low order. Such an instrument gives a resolution similar to that of a grating spectrometer but has, at that resolution, a much higher light gathering power. The spectrometer is capable of resolving the sodium D lines in the twilight airglow, scanning once per minute. Some preliminary results on the variation of D2/D1 ratio during twilight are presented. This type of spectrometer should be useful for a number of other applications.

High Resolution Atomic Absorption Spectrometry with a Scanning Fabry-Perot Interferometer

1973 ◽  
Vol 27 (5) ◽  
pp. 361-365 ◽  
Author(s):  
Claude Veillon ◽  
Philip Merchant
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Continuum Source ◽  
Reflective Coating ◽  
Light Gathering Power ◽  
Fabry Perot ◽  
Light Gathering ◽  
Grating Monochromator ◽  
Absorption Measurements ◽  
Multilayer Dielectric

A stable, piezoelectric scanning Fabry-Perot interferometer is used in conjunction with a conventional grating monochromator to obtain an over-all spectral bandwidth of 0.013 Å with moderate light-gathering power. A multilayer dielectric reflective coating is used for atomic absorption measurements with a continuum source in the 3200 to 3600 Å region. Results for Cu and Ag show that sensitivities obtained are the same as those obtained with line sources. Profiles of the 3247 Å copper and 3383 Å silver resonance lines were obtained, and the half-widths reported.

Real-time simulation of accommodation and low-order aberrations of the human eye using light-gathering trees

2021 ◽  
Author(s):  
Alex R. Cunha Lima ◽  
Arthur M. Medeiros ◽  
Vitor G. Marques ◽  
Manuel M. Oliveira
Keyword(s):  
Real Time ◽  
Real Time Simulation ◽  
Human Eye ◽  
Time Simulation ◽  
Light Gathering ◽  
Low Order

High depth-of-field imaging without sacrificing light-gathering power and resolution

1997 ◽  
Author(s):  
Alan R. FitzGerrell ◽  
Edward R. Dowski, Jr.
Keyword(s):  
Depth Of Field ◽  
Light Gathering Power ◽  
Light Gathering ◽  
Field Imaging ◽  
High Depth

Merging Data from Large and Small Telescopes – Good or Bad? And: How Useful is the Application of Statistical Weights to Time-Series Photometric Measurements?

2003 ◽  
Vol 12 (2) ◽  
Author(s):  
G. Handler
Keyword(s):  
Fourier Transforms ◽  
Light Curves ◽  
Data Sets ◽  
Effective Number ◽  
Spectral Window ◽  
Light Gathering Power ◽  
Data Weighting ◽  
Light Gathering ◽  
Data Points ◽  
Photometric Measurements

AbstractI have investigated the value of the contribution of small telescopes to the success of a whole WET run. To this end, I have applied different data weighting schemes to two extreme WET test data sets. I find that weights proportional to the inverse local scatter in the light curves produce Fourier Transforms of best signal-to-noise. Weighting data stronger than their inverse scatter does not yield optimal results because of the reduction of the effective number of data points.The contribution of the small telescopes to the combined WET results was found to be very important. They do not only improve the spectral window, but they can reduce the noise in the total FT by more than their light gathering power would imply. Some suggestions for the optimal use of small telescopes in the WET are given.

scholarly journals Wide-Field-Imaging 3-Mirror-Systems by High Light Gathering Power and a Wide-Field Optical System for the ‘Large Imaging Telescope’ (Lite)

1994 ◽  
Vol 161 ◽  
pp. 101-107
Author(s):  
U. Laux
Keyword(s):  
Optical System ◽  
High Light ◽  
Field Of View ◽  
Wide Field ◽  
Light Gathering Power ◽  
Imaging Telescope ◽  
Light Gathering ◽  
Field Imaging ◽  
Wide Field Imaging

The desire of astronomers for wide field telescope systems which surpass the RCC (1:8 max. 1.5 degree) in light gathering power and field of view are relative concrete today. For this type of telescope, detectors planned ARE CCDs in multichip arrangement.

scholarly journals Further observations on the spectrum of the night sky

1923 ◽  
Vol 103 (720) ◽  
pp. 45-52 ◽  
Keyword(s):  
Camera Lens ◽  
The Past ◽  
Light Gathering Power ◽  
Identical Construction ◽  
Light Gathering ◽  
Minimum Number ◽  
Night Sky ◽  
Collimating Lens ◽  
Past Winter

During the past winter I have continued my studies on the spectrum of the night sky, and the connected subject of the auroral spectrum. The present paper reports the results obtained. The spectrographs used in this work are two of nearly identical construction. In designing them the paramount consideration was to obtain the greatest possible light gathering power, all other considerations being kept subordinate to this. It was accordingly decided to use the minimum number of optical pieces—one prism, one collimating lens, one camera lens, neither of the latter to be achromatic.

Experimental study of the response of a bad cavity bistable system to fast light switch-on

1984 ◽  
Vol 313 (1525) ◽  
pp. 417-420 ◽  
Keyword(s):  
Light Field ◽  
Single Mode ◽  
Bistable System ◽  
Preliminary Results ◽  
Fabry Perot ◽  
Atomic Beams ◽  
Fast Light ◽  
Branch Switching ◽  
Atom Dynamics ◽  
System Approaches

Preliminary results are reported on the response of an intrinsic bistable system to the rapid switch-on of an injected light field. The bistable system consists of a linear array of 25 sodium atomic beams contained in a low finesse Fabry—Perot etalon. The beams are aligned perpendicular to the direction of propagation of the cavity field and are collimated sufficiently to resolve the D-line ground state 3 2 S 1/2 hyperfine structure. The etalon conditions are such that the cavity lifetime is an estimated 6 ns compared with the atomic lifetime of 16 ns; hence the system approaches the bad cavity limit in which the atom dynamics should be observable. The radiation from a single-mode ring dye laser is switched on to the bistable system in approximately 1 ns. Although preliminary results show low branch to high branch switching there is no evidence of the expected nutational oscillations.

A far-infrared Fabry—Pérot interferometer and grating spectrometer for balloon-borne astronomy

1983 ◽  
Vol 23 (1) ◽  
pp. 43-50 ◽  
Author(s):  
G. Poulter ◽  
R.E. Jennings
Keyword(s):  
Far Infrared ◽  
Grating Spectrometer ◽  
Fabry Perot

Use of a Low Order Fabry-Perot Resonator for Infrared Laser Line Selection

1969 ◽  
Vol 8 (8) ◽  
pp. 1745 ◽  
Author(s):  
V. Daneu
Keyword(s):  
Infrared Laser ◽  
Laser Line ◽  
Fabry Perot ◽  
Line Selection ◽  
Low Order

The light gathering power of optical systems with an electron optical member

1956 ◽  
Vol 6 (1) ◽  
pp. 21-21
Author(s):  
Antonín Vaško
Keyword(s):  
Optical Systems ◽  
Light Gathering Power ◽  
Light Gathering
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