SPICA: A 3.5m space infrared telescope for mid- and far-infrared astronomy

Onaka, Takashi

doi:10.1016/j.asr.2005.05.087

Cited by 25 publications

(13 citation statements)

References 23 publications

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“…An alterna tive solution to compensation is a cooled mirror, an option being explored for future space missions such as the Japanese Space Infrared Telescope for Cosmology and Astrophysics (SPICA) [182].…”

Section: Resultsmentioning

confidence: 99%

SHIFTS: simulator for the Herschel imaging Fourier transform spectrometer

Lindner

Naylor

Swinyard

2006

Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter

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The Spectral and Photometric Imaging Receiver (SPIRE) is one of three scientific instruments on the European Space Agency's (ESAs) Herschel Space Observatory (HSO). The medium resolution spectroscopic capabilities of SPIRE are provided by an imaging Fourier transform spectrometer (IFTS). A software simulator of the SPIRE IFTS was written to generate realistic data products, making use of available qualification and test data. We present the design and implementation of the simulator. Component and end-to-end simulations were compared to results from the first

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Section: Resultsmentioning

confidence: 99%

SHIFTS: simulator for the Herschel imaging Fourier transform spectrometer

Lindner

Naylor

Swinyard

2006

Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter

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“…The largest space mirror (Herschel) ever launched is made of 12 segments brazed together. 1 Since last century, joining methods have been widely studied for joining of engineering ceramics, for example Al 2 O 3 , SiC and ZrB 2 , with themselves or with other types of materials. [2][3][4][5][6][7][8][9] Among all these kinds of ceramics, joining of SiC would arouse the greatest interest because of its inherent characteristics such as good mechanical properties, low density and coefficient of thermal expansion coupled with excellent optical performance.…”

Section: Introductionmentioning

confidence: 99%

Development of SiC–SiC joint by reaction bonding method using SiC/C tapes as the interlayer

Luo

Jiang

Zhang

et al. 2012

Journal of the European Ceramic Society

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“…However, after the ceramics workpiece is removed from the polishing machine for the measurement, it is difficult for the workpiece to be reattached to the same position on the polishing machine with sub-micrometric accuracy. Therefore, in order to avoid the misalignment due to the attachment and detachment of the workpiece, the on-machine measurement systems have been required (Mou and Richard, 1992, Onaka and Nakagawa, 2005, Rahman et al, 2008. With the increase in the size of the sliding parts made of the ceramics materials, the on-machine measurement system is required not only sub-micrometric measurement accuracy but also the measurement range of several hundred millimeters.…”

Section: Introductionmentioning

confidence: 99%

On-machine form measurement of high precision ceramics parts by using a laser displacement sensor

Ito

Matsuura

Meguro

et al. 2014

JAMDSM

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Ceramics materials have excellent mechanical characteristics such as high-stiffness, low-thermal expansion, wear resistance and light weight. Owing to those characteristics, the ceramics parts have been used for the sliding part of the precision positioning stages. However, it is difficult for the ceramics workpieces to achieve the desired form accuracy in once machining process because of the brittleness of the ceramics materials. The compensation of the form error is processed by the manual procedures in general, so it requires a skill of the operator and a great deal of time. In order to realize the automation of the error compensation, it is necessary to measure the workpiece form on the machine tool. In this study, an on-machine form measurement system using a laser displacement sensor having nanometric accuracy is introduced for the surface form measurement of the precision ceramics workpieces. The laser displacement sensor is mounted on the tool post of the ultra-precision polishing machine to realize the on-machine measurement of the ceramics workpieces. By using two horizontal linear slides of the machine tool, the laser displacement sensor can scan the surface of the workpiece with sub-micrometric motion accuracy. Consequently, three-dimensional continuous surface form of the precisely machined ceramics workpiece can be obtained in non-contact condition. In order to evaluate the measurement accuracy of the constructed system, the experiments to investigate stability and motion accuracy were conducted, and then the form measurement of the precision ceramics parts is carried out by using the proposed measurement system. : Ceramics, On-machine measurement, Non-contact measurement, Laser displacement sensor, Ultra-precision machining tool, Ultra-precision grinding IntroductionUltra-precision positioning stages are utilized in various instruments such as ultra-precision machine tools, semiconductor manufacturing equipments, optical apparatus, and precision measurement instruments (Nakamoto, 2006). With the high density and miniaturization of the devices, the precision positioning stages have been required both of nanometric positioning accuracy and travel range of several hundred millimeters. The positioning accuracy and motion accuracy of the positioning stages are relied on the form accuracy of the sliding surface. In general, the sliding part of the positioning stage is made of the metallic material. However, the form accuracy of the metallic sliding part is not enough for the ultra-precision positioning with nanometric accuracy because of thermal expansion, wear of the sliding surface and its own weight (Ostuka, 2009). Therefore, in the recent years, the sliding parts made of the ceramics materials are employed for the ultra-precision positioning stages. Ceramics materials have the excellent mechanical characteristics such as high-stiffness, low thermal expansion, wear resistance, and light weight (Sugawara, 2013).In order to realize the nanometric positioning accuracy, the form accuracy of sub-...

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SPICA: A 3.5m space infrared telescope for mid- and far-infrared astronomy

Cited by 25 publications

References 23 publications

SHIFTS: simulator for the Herschel imaging Fourier transform spectrometer

SHIFTS: simulator for the Herschel imaging Fourier transform spectrometer

Development of SiC–SiC joint by reaction bonding method using SiC/C tapes as the interlayer

On-machine form measurement of high precision ceramics parts by using a laser displacement sensor

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