Difficulties in determining the shape of the instrumental line for a semiconductor spectrometer at photon energies of 20?30 keV

1987 ◽  
Vol 30 (7) ◽  
pp. 710-714
Author(s):  
A. G. Egorov ◽  
S. A. Sidorenko ◽  
G. E. Shchukin ◽  
L. M. Bak ◽  
K. P. Yakovlev
Keyword(s):  
Instrumental Line ◽  
Semiconductor Spectrometer

scholarly journals Technical note: Sensitivity of instrumental line shape monitoring for the ground-based high-resolution FTIR spectrometer with respect to different optical attenuators

2017 ◽  
Vol 10 (3) ◽  
pp. 989-997 ◽  
Author(s):  
Youwen Sun ◽  
Mathias Palm ◽  
Christine Weinzierl ◽  
Christof Petri ◽  
Justus Notholt ◽  
...  
Keyword(s):  
High Resolution ◽  
Line Shape ◽  
Radiant Energy ◽  
Technical Note ◽  
Total Carbon ◽  
Atmospheric Composition ◽  
Incident Intensity ◽  
Instrumental Line ◽  
Ftir Spectrometer ◽  
Potential Strategy

Abstract. The TCCON (Total Carbon Column Observing Network) and most NDACC (Network for Detection of Atmospheric Composition Change) sites assume an ideal ILS (instrumental line shape) for analysis of the spectra. In order to adapt the radiant energy received by the detector, an attenuator or different sizes of field stop can be inserted in the light path. These processes may alter the alignment of a high-resolution FTIR (Fourier transform infrared) spectrometer, and may result in bias due to ILS drift. In this paper, we first investigated the sensitivity of the ILS monitoring with respect to application of different kinds of attenuators for ground-based high-resolution FTIR spectrometers within the TCCON and NDACC networks. Both lamp and sun cell measurements were conducted after the insertion of five different attenuators in front of and behind the interferometer. The ILS characteristics derived from lamp and sun spectra are in good agreement. ILSs deduced from all lamp cell measurements were compared. As a result, the disturbances to the ILS of a high-resolution FTIR spectrometer with respect to the insertion of different attenuators at different positions were quantified. A potential strategy to adapt the incident intensity of a detector was finally deduced.

scholarly journals Calibration and instrumental line shape characterization of a set of portable FTIR spectrometers for detecting greenhouse gas emissions

2015 ◽  
Vol 8 (7) ◽  
pp. 3047-3057 ◽  
Author(s):  
M. Frey ◽  
F. Hase ◽  
T. Blumenstock ◽  
J. Groß ◽  
M. Kiel ◽  
...  
Keyword(s):  
Line Shape ◽  
External Source ◽  
Calibration Procedure ◽  
Total Carbon ◽  
Instrumental Performance ◽  
Solar Absorption ◽  
Ground Pressure ◽  
Before And After ◽  
Instrumental Line ◽  
The Individual

Abstract. A comprehensive calibration procedure for mobile, low-resolution, solar-absorption FTIR spectrometers, used for greenhouse gases observations, is developed. These instruments commend themselves for campaign use and deployment at remote sites. The instrumental line shape (ILS) of each spectrometer has been thoroughly characterized by analyzing the shape of H2O signatures in open path spectra. A setup for the external source is suggested and the invariance of derived ILS parameters with regard to chosen path length is demonstrated. The instrumental line shape characteristics of all spectrometers were found to be close to nominal. Side-by-side solar observations before and after a campaign, which involved shipping of all spectrometers to a selected target site and back, are applied for verifying the temporal invariability of instrumental characteristics and for deriving intercalibration factors for XCO2 and XCH4, which take into account residual differences of instrumental characteristics. An excellent level of agreement and stability was found between the different spectrometers: the uncorrected biases in XCO2 and XCH4 are smaller than 0.01 and 0.15 %, respectively, and the drifts are smaller than 0.005 and 0.035 %. As an additional sensitive demonstration of the instrumental performance we show the excellent agreement of ground pressure values obtained from the total column measurements of O2 and barometric records. We find a calibration factor of 0.9700 for the spectroscopic measurements in comparison to the barometric records and a very small scatter between the individual spectrometers (0.02 %). As a final calibration step, using a co-located TCCON (Total Carbon Column Observation Network) spectrometer as a reference, a common scaling factor has been derived for the XCO2 and XCH4 products, which ensures that the records are traceable to the WMO in situ scale.

scholarly journals Characteristics of natural radiation background at the Callio Lab (Finland) performed within the BSUIN project

2020 ◽  
Author(s):  
Jan Kisiel ◽  
Kinga Polaczek-Grelik ◽  
Katarzyna Szkliniarz ◽  
Agata Walencik-Łata ◽  
Jari Joutsenvaara ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Gamma Ray ◽  
Background Radiation ◽  
Gamma Ray Spectrometry ◽  
Radiation Background ◽  
Rock Samples ◽  
Baltic Sea Region ◽  
Semiconductor Spectrometer ◽  
The Baltic

<p>The BSUIN (Baltic Sea Underground Innovation Network) aims to enhance the accessibility of the underground laboratories in the Baltic Sea region for innovation, business and science. One of the BSUIN project activities is characterization of natural background radiation (NBR) in underground facilities. In this talk results from NBR measurements performed in Callio Lab, Pyhäsalmi, Finland, at the depth of 4100 m w.e. will be presented. The in-situ gamma spectra were collected with the use of  HPGe semiconductor spectrometer, whereas the  concentration of radon were measured with RAD7 electronic detector. In addition, the water and rock samples were taken for laboratory analysis in Institute of Physics, University of Silesia, Poland. The concentration radioisotopes in water samples were performed by using a liquid scintillation α/β counter (LSC) and α-particle spectrometry, while the concentration of radioisotopes in rock samples were performed by using laboratory gamma ray spectrometry and also α-particle spectrometry.</p>

Implied Polyphony in the Solo String Works of J. S. Bach: A Case for the Perceptual Relevance of Structural Expression

2006 ◽  
Vol 23 (5) ◽  
pp. 423-446 ◽  
Author(s):  
Stacey Davis
Keyword(s):  
Statistical Analysis ◽  
Aesthetic Quality ◽  
Perceptual Effect ◽  
Multiple Voices ◽  
Instrumental Line ◽  
Analytical System ◽  
And Function

Bach created a sense of counterpoint in his unaccompanied string works by outlining multiple voices within a single instrumental line. In order to better understand the construction and function of this implied polyphony, an analytical system was developed that provides guidelines for determining where transitions between implied voices occur. Two experiments then investigated how implied polyphony affects the perceived aesthetic quality of these pieces. The hypothesis was that Bach used implied polyphony to create “structural expression,” something that would enhance the melody’s appeal without the aid of performer expressivity. Statistical analysis of the results confirmed that passages containing implied polyphony are indeed considered more engaging than those that were recomposed to diminish the sense of counterpoint. Results also suggest, however, that all instances of implied polyphony do not have the same perceptual effect. Listener’s judgments of engagingness were significantly affected when the implied polyphony created simultaneous, linear streams, but not when it created a sense of successive grouping structure.

Characterization of standard reference materials for obtaining instrumental line profiles

1998 ◽  
Vol 13 (4) ◽  
pp. 210-215 ◽  
Author(s):  
Matteo Leoni ◽  
Paolo Scardi ◽  
J. Ian Langford
Keyword(s):  
Reference Materials ◽  
Profile Analysis ◽  
Standard Reference Materials ◽  
Line Profile Analysis ◽  
Line Profiles ◽  
Instrumental Line ◽  
Geometrical Effects ◽  
Structural Imperfections

Standard Reference Materials (SRMs) for determining instrumental line profiles should not exhibit measurable broadening from structural imperfections, but owing the effects of sample transparency and other geometrical effects, the quality of possible SRMs cannot necessarily be assessed satisfactorily with data from a conventional divergent-beam diffractometer. The problem of transparency can be avoided if parallel beam optics is used, as for instance on a synchrotron radiation powder diffraction station employing Parrish (Soller-type receiving slit assembly) geometry. Data from such a configuration are used to compare three SRMs commonly used in line-profile analysis.

Multilayer semiconductor spectrometer for studying light neutron-rich nuclei

2000 ◽  
Vol 446 (3) ◽  
pp. 461-468 ◽  
Author(s):  
M.G. Gornov ◽  
Yu.B. Gurov ◽  
P.V. Morokhov ◽  
S.V. Lapushkin ◽  
V.A. Pechkurov ◽  
...  
Keyword(s):  
Semiconductor Spectrometer
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