A Charge Coupled Device Array Detector for Single-Wavelength and Multiwavelength Ultraviolet Absorbance in Capillary Electrophoresis

1999 ◽  
Vol 71 (19) ◽  
pp. 4376-4384 ◽  
Author(s):  
Edmund T. Bergström ◽  
David M. Goodall ◽  
Boris Pokrić ◽  
Nigel M. Allinson
Keyword(s):  
Capillary Electrophoresis ◽  
Array Detector ◽  
Charge Coupled Device ◽  
Ultraviolet Absorbance ◽  
A Charge

scholarly journals The automated patrol telescope

1986 ◽  
Vol 118 ◽  
pp. 85-86
Author(s):  
J. W. Cochrane ◽  
P. Mitchell ◽  
P. W. Payne ◽  
J. W. V. Storey ◽  
B. L. Webster
Keyword(s):  
New South ◽  
Array Detector ◽  
Schmidt Telescope ◽  
Charge Coupled Device ◽  
South Wales ◽  
Ccd Array ◽  
On Line ◽  
Computer Controlled ◽  
A Charge ◽  
North Western

A new astronomical system is nearing completion at U.N.S.W. in which a charge coupled device (CCD) array detector is matched to a Schmidt telescope, with the observations completely analyzed on-line. We have modified a Baker-Nunn satellite tracking camera, with its excellent 0.5m, f/1 super-Schmidt optics, converting it into a computer-controlled equatorially-mounted astronomical telescope. The telescope is expected to be located at Siding Spring Observatory in north-western New South Wales.

Man-Portable Laser-Induced Breakdown Spectroscopy System for in Situ Characterization of Karstic Formations

2008 ◽  
Vol 62 (11) ◽  
pp. 1250-1255 ◽  
Author(s):  
J. Cuñat ◽  
F. J. Fortes ◽  
L. M. Cabalín ◽  
F. Carrasco ◽  
M. D. Simón ◽  
...  
Keyword(s):  
Field Testing ◽  
Array Detector ◽  
Depth Information ◽  
Charge Coupled Device ◽  
Breakdown Spectroscopy ◽  
Ccd Array ◽  
Laser Induced Breakdown ◽  
Environment Identification ◽  
A Charge ◽  
Identification Analysis

This paper reports the development and field testing of a man-portable instrument based on laser-induced breakdown spectrometry (LIBS) for inspection and analysis of speleothems. The 50 mJ of a Q-switched Nd:YAG laser operating at 1064 nm was used to generate a plasma on the sample. Plasma emission was then guided using a fiber-optic cable to a 1/10 m spectrometer equipped with a charge-coupled device (CCD) array detector. Plasma light was automatically processed in order to obtain surface and in-depth information from the speleothems. A field campaign in the interior of Nerja Cave (a large karstic formation in the South of Spain) has been carried out, aimed at evaluating the analytical performance of the instrument when operating in an unfriendly environment. Identification analysis of the speleothems' alteration layers and depth profiles of Sr and Ca is carried out and reported.

scholarly journals The Ultraviolet Visible Hyperspectral Imaging Spectrometer (UVHIS), and high-resolution NO<sub>2</sub> mapping from its first airborne observation

2020 ◽  
Author(s):  
Liang Xi ◽  
Fuqi Si ◽  
Yu Jiang ◽  
Haijin Zhou ◽  
Kai Zhan ◽  
...  
Keyword(s):  
Hyperspectral Imaging ◽  
Optical Design ◽  
Optical Absorption Spectroscopy ◽  
Array Detector ◽  
Vertical Column ◽  
Imaging Spectrometer ◽  
Charge Coupled Device ◽  
Ccd Array ◽  
Airborne Imaging ◽  
A Charge

Abstract. We present a novel airborne imaging differential optical absorption spectroscopy (DOAS) instrument: Ultraviolet Visible Hyperspectral Imaging Spectrometer (UVHIS), which is developed for trace gas monitoring and pollution mapping. Within a broad spectral range from 200 to 500 nm, operated in three channels, the spectral resolution of UVHIS is better than 0.5 nm. The optical design of each channel comprises a fore-optics with a field of view (FOV) of 40°, an Offner imaging spectrometer, and a charge-coupled device (CCD) array detector of 1032 × 1072 pixels. A first demonstration flight using UVHIS was undertaken on 23 June 2018, above an approximate 600 km2 area in Feicheng, China, with a spatial resolution of about 25 × 22 m2. Measurements of nadir backscattered solar radiation of channel 3 are used to retrieve vertical column densities (VCDs) of NO2 with a mean fitting error of 2.6 × 1015 molec cm−2. The UVHIS instrument clearly detected several emission plumes transporting from south to north, with a peak value of 3 × 1016 molec cm−2 in the dominant one. UVHIS NO2 vertical columns are well correlated with ground-based mobile DOAS observations, with a correlation coefficient of 0.65 for all co-located measurements, and a slight underestimation for polluted observations. This study demonstrates the capability of UVHIS for NO2 local emission and transmission monitoring.

scholarly journals Spectroscopic flat-fields can be used for precision CCD gain and noise tests

2021 ◽  
Vol 38 ◽  
Author(s):  
J. Gordon Robertson
Keyword(s):  
Ccd Camera ◽  
Matched Pair ◽  
Optical Fibres ◽  
Charge Coupled Device ◽  
Small Areas ◽  
Flat Field ◽  
Basic Parameters ◽  
The Mean ◽  
A Charge ◽  
Analogue To Digital

Abstract One of the basic parameters of a charge coupled device (CCD) camera is its gain, that is, the number of detected electrons per output Analogue to Digital Unit (ADU). This is normally determined by finding the statistical variances from a series of flat-field exposures with nearly constant levels over substantial areas, and making use of the fact that photon (Poisson) noise has variance equal to the mean. However, when a CCD has been installed in a spectroscopic instrument fed by numerous optical fibres, or with an echelle format, it is no longer possible to obtain illumination that is constant over large areas. Instead of making do with selected small areas, it is shown here that the wide variation of signal level in a spectroscopic ‘flat-field’ can be used to obtain accurate values of the CCD gain, needing only a matched pair of exposures (that differ in their realisation of the noise). Once the gain is known, the CCD readout noise (in electrons) is easily found from a pair of bias frames. Spatial stability of the image in the two flat-fields is important, although correction of minor shifts is shown to be possible, at the expense of further analysis.

Detailed Performance Analysis of a 10kW Dish∕Stirling System

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
W. Reinalter ◽  
S. Ulmer ◽  
P. Heller ◽  
T. Rauch ◽  
J.-M. Gineste ◽  
...  
Keyword(s):  
Electric Energy ◽  
Optical Quality ◽  
Stirling Engine ◽  
Thermodynamic Efficiency ◽  
Ambient Conditions ◽  
Camera System ◽  
Charge Coupled Device ◽  
Mapping System ◽  
Conversion Unit ◽  
A Charge

The CNRS-Promes dish∕Stirling system was erected in Jun. 2004 as the last of three country reference units built in the “Envirodish” project. It represents the latest development step of the EuroDish system with many improved components. With a measured peak of 11kW electrical output power, it is also the best performing system so far. The measurement campaign to determine the optical and thermodynamic efficiency of the system is presented. The optical quality of the concentrator and the energy input to the power conversion unit was measured with a classical flux-mapping system using a Lambertian target and a charge coupled device camera system. An efficiency of the concentrator including the intercept losses of 74.4% could be defined for this particular system. For the thermodynamic analysis all the data necessary for a complete energy balance around the Stirling engine were measured or approximated by calculations. For the given ambient conditions during the tests, a Stirling engine efficiency of 39.4% could be measured. The overall efficiency for the conversion of solar to electric energy was 22.5%.

scholarly journals X-ray transmission grating spectrometer with CCD detector for laser plasma studies

1991 ◽  
Vol 9 (2) ◽  
pp. 579-591 ◽  
Author(s):  
L. Pína ◽  
H. Fiedorowicz ◽  
M. O. Koshevoi ◽  
A. A. Rupasov ◽  
B. Rus ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Array Detector ◽  
Charge Coupled Device ◽  
X Ray ◽  
Transmission Grating ◽  
Hot Plasma ◽  
Ccd Detector ◽  
Wet Processing

A program is under way to develop methods and instrumentation based on charge-coupled device (CCD) sensors for hot plasma diagnostics. We have developed a new X-ray spectrometer in which a freestanding X-ray transmission grating is coupled to a CCD linear array detector with electronic digitized readout replacing film and its wet processing. This instrument measures time-integrated pulsed X-ray spectra with moderate spectral resolution (δλ ≤ 0.6 nm) over a broad spectral range (0.3–2 keV) with high sensitivity, linearity, and large dynamic range. The performance of the device was tested using laser plasma as the X-ray source.

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