scholarly journals Space Astrometry JASMINE

2007 ◽  
Vol 3 (S248) ◽  
pp. 296-297 ◽  
Author(s):  
T. Yano ◽  
N. Gouda ◽  
Y. Kobayashi ◽  
Y. Yamada ◽  
T. Tsujimoto ◽  
...  
Keyword(s):  
Near Infrared ◽  
Focal Length ◽  
Field Of View ◽  
Galactic Bulge ◽  
Satellite Mission ◽  
Fully Depleted ◽  
Thick Substrate ◽  
Trigonometric Parallaxes ◽  
Space Astrometry ◽  
Back Illuminated

AbstractJASMINE is the acronym of the Japan Astrometry Satellite Mission for INfrared (z-band: 0.9 micron) Exploration, and is planned to be launched around 2017. The main objective of JASMINE is to study the fundamental structure and evolution of the Milky Way bulge components. In order to accomplish these objectives, JASMINE will measure trigonometric parallaxes, positions and proper motions of about ten million stars in the Galactic bulge with a precision of 10 microarcsec at z = 14mag.The primary mirror for the telescope has a diameter of 75cm with a focal length of 22.5m. The back-illuminated CCD is fabricated on a 300 micron thick substrate which is fully depleted. These thick devices have extended near infrared response. The size of the detector for z-band is 3cm×3cm with 2048×2048 pixels. The size of the field of view is about 0.6deg×0.6deg by using 64 detectors on the focal plane. The telescope is designed to have only one field of view, which is different from the designs of other astrometric satellites. JASMINE will observe overlapping fields without gaps to survey a total area of about 20deg×10 deg around the Galactic bulge. Accordingly we make a “large frame” of 20deg×10 deg by linking the small frames using stars in overlapping regions. JASMINE will observe the Galactic bulge repeatedly during the mission life of about 5 years.

scholarly journals A Back-Illuminated Time-of-Flight Image Sensor with SOI-Based Fully Depleted Detector Technology for LiDAR Application

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 798 ◽  
Author(s):  
Sanggwon Lee ◽  
Keita Yasutomi ◽  
Ho Hai Nam ◽  
Masato Morita ◽  
Shoji Kawahito
Keyword(s):  
Near Infrared ◽  
Time Of Flight ◽  
Image Sensor ◽  
Light Signal ◽  
Silicon On Insulator ◽  
Light Power ◽  
Fully Depleted ◽  
Range Resolution ◽  
Back Illuminated ◽  
Detector Technology

A back-illuminated time-of-flight (ToF) image sensor based on a 0.2 µm silicon-on-insulator (SOI) CMOS detector technology using fully-depleted substrate is developed for the light detection and ranging (LiDAR) applications. A fully-depleted 200 µm-thick bulk silicon is used for the higher quantum efficiency (QE) in a near-infrared (NIR) region. The developed SOI pixel structure has a 4-tapped charge modulator with a draining function to achieve a higher range resolution and to cancel background light signal. A distance is measured up to 27 m with a range resolution of 12 cm at the outdoor and average light power density is 150 mW/m2@30 m.

scholarly journals Infrared space astrometry project JASMINE

2007 ◽  
Vol 3 (S248) ◽  
pp. 248-251
Author(s):  
N. Gouda ◽  
Y. Kobayashi ◽  
Y. Yamada ◽  
T. Yano ◽  
Keyword(s):  
Milky Way ◽  
Development Phase ◽  
Preliminary Design ◽  
Proper Motions ◽  
Galactic Bulge ◽  
Satellite Mission ◽  
Technical Issues ◽  
Space Astrometry ◽  
Scientific Results ◽  
K Band

AbstractA Japanese plan of an infrared (z-band:0.9 μas or k-band:2.2 μas) space astrometry (JASMINE-project) is introduced. JASMINE (Japan Astrometry Satellite Mission for INfrared Exploration) will measure distances and tangential motions of stars in the bulge of the Milky Way. It will measure parallaxes, positions with an accuracy of 10 μas and proper motions with an accuracy of 10 μas/year for stars brighter than z=14 mag or k=11 mag. JASMINE will observe about ten million stars belonging to the bulge component of our Galaxy. With a completely new “map” of the Galactic bulge, it is expected that many new exciting scientific results will be obtained in various fields of astronomy. Presently, JASMINE is in a development phase, with a targeted launch date around 2016. Science targets, preliminary design of instruments, observing strategy, critical technical issues in JASMINE and also Nano-JASMINE project are described in this paper.

scholarly journals JASMINE: constructor of the dynamical structure of the Galactic bulge

2007 ◽  
Vol 3 (S245) ◽  
pp. 355-358
Author(s):  
N. Gouda ◽  
Y. Kobayashi ◽  
Y. Yamada ◽  
T. Yano ◽  
T. Tsujimoto ◽  
...  
Keyword(s):  
High Accuracy ◽  
Dynamical Structure ◽  
Preliminary Design ◽  
Proper Motions ◽  
Galactic Bulge ◽  
Satellite Mission ◽  
Central Wavelength ◽  
Distance Data ◽  
Space Astrometry ◽  
Scientific Results

AbstractWe introduce a Japanese space astrometry project which is called JASMINE. JASMINE (Japan Astrometry Satellite Mission for INfrared Exploration) will measure distances and tangential motions of stars in the Galactic bulge with yet unprecedented precision. JASMINE will operate in z-band whose central wavelength is 0.9 micron. It will measure parallaxes, positions with accuracy of about 10 micro-arcsec and proper motions with accuracy of about 10 micro- arcsec/year for the stars brighter than z=14 mag. The number of stars observed by JASMINE with high accuracy of parallaxes in the Galactic bulge is much larger than that observed in other space astrometry projects operating in optical bands. With the completely new “map of the Galactic bulge” including motions of bulge stars, we expect that many new exciting scientific results will be obtained in studies of the Galactic bulge. One of them is the construction of the dynamical structure of the Galactic bulge. Kinematics and distance data given by JASMINE are the closest approach to a view of the exact dynamical structure of the Galactic bulge.Presently, JASMINE is in a development phase, with a target launch date around 2016. We comment on the outline of JASMINE mission, scientific targets and a preliminary design of JASMINE in this paper.

Infrared space astrometry mission for survey of the Galactic nuclear bulge: Small-JASMINE

2019 ◽  
Vol 14 (S353) ◽  
pp. 51-53
Author(s):  
Naoteru Gouda ◽  
Keyword(s):  
Black Hole ◽  
Near Infrared ◽  
Galactic Center ◽  
Scientific Objective ◽  
Satellite Mission ◽  
Infrared Band ◽  
Supermassive Black Hole ◽  
Space Astrometry ◽  
Galactic Structures ◽  
Astrometric Data

AbstractSmall-JASMINE will provide astrometric data with high precisions in a near infrared band for stars in the Galactic nuclear bulge and other specific targets. The primary scientific objective is to carry out the Galactic Center Archeology by exploring the Galactic nuclear bulge that leads to the elucidation of the Galactic structures and the evolution of the supermassive black hole at the center. Small-JASMINE has been selected as the unique candidate for the competitive 3rd M-class science satellite mission by ISAS/JAXA. The launch date is mid-2020s.

A High Resolution Scanning Microscope

1968 ◽  
Vol 26 ◽  
pp. 356-357
Author(s):  
A. V. Crewe ◽  
J. Wall ◽  
L. M. Welter
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Spherical Aberration ◽  
Focal Length ◽  
Spot Size ◽  
Emission Source ◽  
Field Of View ◽  
Scanning Microscope ◽  
Magnetic Lens ◽  
High Quality

A scanning microscope using a field emission source has been described elsewhere. This microscope has now been improved by replacing the single magnetic lens with a high quality lens of the type described by Ruska. This lens has a focal length of 1 mm and a spherical aberration coefficient of 0.5 mm. The final spot size, and therefore the microscope resolution, is limited by the aberration of this lens to about 6 Å.The lens has been constructed very carefully, maintaining a tolerance of + 1 μ on all critical surfaces. The gun is prealigned on the lens to form a compact unit. The only mechanical adjustments are those which control the specimen and the tip positions. The microscope can be used in two modes. With the lens off and the gun focused on the specimen, the resolution is 250 Å over an undistorted field of view of 2 mm. With the lens on,the resolution is 20 Å or better over a field of view of 40 microns. The magnification can be accurately varied by attenuating the raster current.

Metallicity of Red Giants in the Galactic Bulge from Near-Infrared Spectroscopy

2000 ◽  
Vol 120 (2) ◽  
pp. 833-844 ◽  
Author(s):  
Solange V. Ramírez ◽  
Andrew W. Stephens ◽  
Jay A. Frogel ◽  
D. L. DePoy
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Red Giants ◽  
Galactic Bulge

Optimisation of Magnification Levels for near Infrared Chemical Imaging of Blending of Pharmaceutical Powders

2007 ◽  
Vol 15 (3) ◽  
pp. 137-151 ◽  
Author(s):  
Hua Ma ◽  
Carl A. Anderson
Keyword(s):  
Near Infrared ◽  
Image Data ◽  
Principal Component ◽  
Chemical Imaging ◽  
Field Of View ◽  
Pharmaceutical Dosage Forms ◽  
Component Distribution ◽  
Circular Field ◽  
Pharmaceutical Powder ◽  
Magnification Level

A critical parameter in the evaluation of pharmaceutical dosage forms by hyperspectral imaging is the level of magnification. If the magnification (as set by the optical objective) is inadequate to resolve the relevant features, then the value of the imaging is diminished; if the magnification level is greater than is required, then the field of view is unnecessarily reduced. The purpose of this study was to determine an optimum magnification level for the study of powder mixing. Relevant features in this system include distribution of individual components within samples and the overall content of a given sample. In the present study, three magnification levels of near infrared (NIR) chemical imaging objectives were evaluated for their effects on imaging a blend of pharmaceutical materials (powders). High, medium and low objective magnification levels were investigated by comparing the resulting blend surface images of a two-component (salicylic acid and lactose) pharmaceutical powder mixture. Multiple images from high and medium magnification were concatenated so that an equivalent field of view was obtained for all magnification levels. Univariate images, principal component analysis score images, partial least squares predicted images and spectra extracted from different intensity regions in the area images were analysed qualitatively and quantitatively for comparison. A series of images spanning a strip across the centre of the circular field were collected at each magnification level and compared with respect to surface features elucidated and area of blend surface imaged. Analyses of images indicate that the three magnification levels delineate the component distribution for this particular powder system similarly. Images obtained at the low magnification level demonstrated adequate resolution and provided the broadest view of the blend surface. It is concluded that the low optical magnification level was adequate for the system being studied and is the preferred mode for pharmaceutical powder blend image data collection for this system.

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