Characterization of uniaxially oriented isotactic polypropylene films using sonic velocity measurements

1986 ◽  
Vol 26 (9) ◽  
pp. 593-599 ◽  
Author(s):  
A. Mahammad Ibrahim ◽  
Alan R. Wedgewood ◽  
James C. Seferis
Keyword(s):  
Isotactic Polypropylene ◽  
Sonic Velocity ◽  
Velocity Measurements ◽  
Polypropylene Films

Characterization of orientation of one-way and two-way drawn isotactic polypropylene films

Polymer ◽  
1993 ◽  
Vol 34 (13) ◽  
pp. 2691-2701 ◽  
Author(s):  
I. Karacan ◽  
A.K. Taraiya ◽  
D.I. Bower ◽  
I.M. Ward
Keyword(s):  
Isotactic Polypropylene ◽  
Polypropylene Films

scholarly journals STRUCTURAL CHARACTERIZATION OF HIGHLY REDRAWN ISOTACTIC POLYPROPYLENE FILMS

1982 ◽  
Vol 38 (1) ◽  
pp. T10-T15 ◽  
Author(s):  
Yuzo Yamamoto ◽  
Mitsuto Dewasawa ◽  
Shigetake Kinoshita
Keyword(s):  
Isotactic Polypropylene ◽  
Structural Characterization ◽  
Polypropylene Films

scholarly journals Densified Pupil Spectrograph as High-precision Radial Velocimetry: From Direct Measurement of the Universe’s Expansion History to Characterization of Nearby Habitable Planet Candidates

2022 ◽  
Vol 163 (2) ◽  
pp. 63
Author(s):  
Taro Matsuo ◽  
Thomas P. Greene ◽  
Mahdi Qezlou ◽  
Simeon Bird ◽  
Kiyotomo Ichiki ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Direct Measurement ◽  
High Precision ◽  
Resolving Power ◽  
Line Of Sight ◽  
High Dispersion ◽  
Velocity Measurements ◽  
Habitable Planet ◽  
Airy Disk

Abstract The direct measurement of the universe’s expansion history and the search for terrestrial planets in habitable zones around solar-type stars require extremely high-precision radial-velocity measures over a decade. This study proposes an approach for enabling high-precision radial-velocity measurements from space. The concept presents a combination of a high-dispersion densified pupil spectrograph and a novel line-of-sight monitor for telescopes. The precision of the radial-velocity measurements is determined by combining the spectrophotometric accuracy and the quality of the absorption lines in the recorded spectrum. Therefore, a highly dispersive densified pupil spectrograph proposed to perform stable spectroscopy can be utilized for high-precision radial-velocity measures. A concept involving the telescope’s line-of-sight monitor is developed to minimize the change of the telescope’s line of sight over a decade. This monitor allows the precise measurement of long-term telescope drift without any significant impact on the Airy disk when the densified pupil spectra are recorded. We analytically derive the uncertainty of the radial-velocity measurements, which is caused by the residual offset of the lines of sight at two epochs. We find that the error could be reduced down to approximately 1 cm s−1, and the precision will be limited by another factor (e.g., wavelength calibration uncertainty). A combination of the high-precision spectrophotometry and the high spectral resolving power could open a new path toward the characterization of nearby non-transiting habitable planet candidates orbiting late-type stars. We present two simple and compact highly dispersed densified pupil spectrograph designs for cosmology and exoplanet sciences.

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