Absolute calibration of space- and time-resolving flat-field vacuum ultraviolet spectrograph under both P and S polarized light conditions for plasma diagnostics

2001 ◽  
Vol 72 (12) ◽  
pp. 4366-4371 ◽  
Author(s):  
Y. Okamoto ◽  
M. Yoshikawa ◽  
N. Yamaguchi ◽  
C. Watabe ◽  
T. Tamano ◽  
...  
Keyword(s):  
Plasma Diagnostics ◽  
Vacuum Ultraviolet ◽  
Polarized Light ◽  
Absolute Calibration ◽  
Light Conditions ◽  
Space And Time ◽  
Flat Field

Absolute Calibration of Space- and Time-Resolving Flat-Field Vacuum Ultraviolet Spectrograph for Plasma Diagnostics

2000 ◽  
Vol 39 (Part 1, No. 6A) ◽  
pp. 3609-3613 ◽  
Author(s):  
Yuuji Okamoto ◽  
Masayuki Yoshikawa ◽  
Naohiro Yamaguchi ◽  
Chikara Watabe ◽  
Teruo Tamano ◽  
...  
Keyword(s):  
Plasma Diagnostics ◽  
Vacuum Ultraviolet ◽  
Absolute Calibration ◽  
Space And Time ◽  
Flat Field

Space‐resolving flat‐field vacuum ultraviolet spectrograph for plasma diagnostics

1994 ◽  
Vol 65 (11) ◽  
pp. 3408-3414 ◽  
Author(s):  
Naohiro Yamaguchi ◽  
Jungo Katoh ◽  
Yukiko Sato ◽  
Tatsuya Aota ◽  
Atsusi Mase ◽  
...  
Keyword(s):  
Plasma Diagnostics ◽  
Vacuum Ultraviolet ◽  
Flat Field

scholarly journals Absolute calibration of vacuum ultraviolet spectrograph system for plasma diagnostics

2004 ◽  
Vol 75 (10) ◽  
pp. 4088-4090 ◽  
Author(s):  
M. Yoshikawa ◽  
Y. Kubota ◽  
T. Kobayashi ◽  
M. Saito ◽  
N. Numada ◽  
...  
Keyword(s):  
Plasma Diagnostics ◽  
Vacuum Ultraviolet ◽  
Absolute Calibration

Space‐ and time‐resolving spectrograph for high‐temperature plasma diagnostics

1986 ◽  
Vol 57 (8) ◽  
pp. 2041-2042 ◽  
Author(s):  
D. Content ◽  
D. Wróblewski ◽  
M. Perry ◽  
H. W. Moos
Keyword(s):  
High Temperature ◽  
Plasma Diagnostics ◽  
Temperature Plasma ◽  
Space And Time ◽  
High Temperature Plasma

scholarly journals An empirical method for absolute calibration of coccolith thickness

2017 ◽  
Author(s):  
Saúl González-Lemos ◽  
José Guitián ◽  
Miguel-Ángel Fuertes ◽  
José-Abel Flores ◽  
Heather M. Stoll
Keyword(s):  
Laboratory Data ◽  
Polarized Light ◽  
Empirical Method ◽  
Absolute Calibration ◽  
Light Spectra ◽  
Independent Determination ◽  
Data Comparability ◽  
Calibration Materials ◽  
Constant Slope

Abstract. As major calcifiers in the open ocean, coccolithophores play a key role in the marine carbon cycle. Because they may be sensitive to changing CO2 and ocean acidification, there is significant interest in quantifying past and present variations in their cellular calcification by quantifying the thickness of the coccoliths or calcite plates that cover their cells. Polarized light microscopy has emerged as a key tool for quantifying the thickness of these calcite plates, but the reproducibility and accuracy of such determinations has been limited by the absence of suitable calibration materials in the thickness range of coccoliths (0–4 microns). Here, we describe the fabrication of a calcite wedge with a constant slope over 15 this thickness range, and the independent determination of calcite thickness along the wedge profile. We show how the calcite wedge provides more robust calibrations in the 0 to 1.55 μm range than previous approaches using rhabdoliths. We show the particular advantages of the calcite wedge approach for developing equations to relate thickness to the interference colors that arise in calcite in the thickness range between 1.55 and 4 μm. The calcite wedge approach can be applied to develop equations relevant to the particular light spectra and intensity of any polarized light microscope system and could significantly improve within and inter-laboratory data comparability.

scholarly journals Intensity Calibration in the Presence of a Disturbing Effect Dependent on Wavelength

1994 ◽  
Vol 161 ◽  
pp. 314-316
Author(s):  
P. Kotrč
Keyword(s):  
Photographic Plate ◽  
Light Conditions ◽  
Light Detector ◽  
Calibration Process ◽  
Image Structure ◽  
Factors Influencing ◽  
Calibration Methods ◽  
Flat Field ◽  
Astronomical Images ◽  
Ccd Detectors

Conversion of light detector signals to intensity values is one of the most important factors influencing precision of spectroscopic observations. Most of the classical light detectors used in astronomical practice are more or less nonlinear. As the photoemulsion has long been the most widespread nonlinear light detector, many improvements in the calibration methods concerned its nonlinearity. In addition to it, there are other substantial sources of inaccuracy in the calibration process of real astronomical images and spectrograms. They are mostly related to real light conditions in telescopes and spectrographs, as well as to the wavelength dependent sensitivity of light detectors. Some of these factors can be taken into account and involved in the calibration process. Similar effects are considered when a flat-field is evaluated for CCD detectors or when image structure varies over a photographic plate.

scholarly journals Technical note: An empirical method for absolute calibration of coccolith thickness

2018 ◽  
Vol 15 (4) ◽  
pp. 1079-1091 ◽  
Author(s):  
Saúl González-Lemos ◽  
José Guitián ◽  
Miguel-Ángel Fuertes ◽  
José-Abel Flores ◽  
Heather M. Stoll
Keyword(s):  
Laboratory Data ◽  
Polarized Light ◽  
Empirical Method ◽  
Technical Note ◽  
Absolute Calibration ◽  
Light Spectra ◽  
Data Comparability ◽  
Calibration Materials ◽  
Constant Slope

Abstract. As major calcifiers in the open ocean, coccolithophores play a key role in the marine carbon cycle. Because they may be sensitive to changing CO2 and ocean acidification, there is significant interest in quantifying past and present variations in their cellular calcification by quantifying the thickness of the coccoliths or calcite plates that cover their cells. Polarized light microscopy has emerged as a key tool for quantifying the thickness of these calcite plates, but the reproducibility and accuracy of such determinations has been limited by the absence of suitable calibration materials in the thickness range of coccoliths (0–4 µm). Here, we describe the fabrication of a calcite wedge with a constant slope over this thickness range, and the independent determination of calcite thickness along the wedge profile. We show how the calcite wedge provides more robust calibrations in the 0 to 1.55 µm range than previous approaches using rhabdoliths. We show the particular advantages of the calcite wedge approach for developing equations to relate thickness to the interference colors that arise in calcite in the thickness range between 1.55 and 4 µm. The calcite wedge approach can be applied to develop equations relevant to the particular light spectra and intensity of any polarized light microscope system and could significantly improve inter-laboratory data comparability.

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