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Digitale Medien

In-situ monitoring of redeposited carbon in the vicinity of a plasma–graphite interacting region (abstract) (1988)

Hsu, Wen L.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 59 (1988), S. 1891-1891

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: The interaction of the plasma with graphite limiters in fusion devices has been observed to lead to the formation of carbon film deposits. This occurs from the erosion of the graphite tiles in a high-flux region and subsequent redeposition of the carbon atoms onto a low-flux surface. The redeposition of carbon has strong ramifications on the in-vessel tritium inventory. A commercially available quartz crystal monitor has been tested in a plasma simulator device to measure the flux of eroded carbon. The test was done with the intent of mounting such a detector in TFTR. The monitor measures the deposited film thickness as a change in the resonance frequency of the crystal. The plasma simulator is a Penning discharge operated with graphite electrodes. Initial tests show the crystal monitor has high sensitivity and can detect film thickness changes of a few angstroms. Thermal shock problems, however, may limit time resolution of the measurement and can provide only an integrated deposited thickness within a discharge. This work was supported by the U. S. DOE.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1140046

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Digitale Medien

An instrument for measuring turbulent pressure fluctuations (1986)

Papadimitrakis, Yiannis Alex ; Hsu, En Yu ; Street, Robert L.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 57 (1986), S. 666-673

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: An instrument is described for laboratory measurements of the fluctuating static pressure in the turbulent boundary layer above progressive water waves. It consists of a disk-shaped sensing head properly designed to minimize the dynamic pressure variation to an acceptable level, a commercially available piezocrystal transducer housed inside a casing, and a forward-bent connecting tube. Pressure fluctuations sampled by the disk are converted into an electrical signal by the piezocrystal transducer. Through low-pass filtering, only the frequency range of interest is retained. The instrument was tested successfully for frequency response, dynamic and mechanical noise sensitivity, and response to spurious pressure fluctuations (produced when operating in a Eulerian wave-following mode) inside a cylindrical chamber and in a wind–wave facility, and some sample results along with the calibration procedures and data analysis are presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1138887

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Digitale Medien

Apparatus and technique for reconstruction of flaws using model-based elastic wave inverse ultrasonic scattering (1986)

Thompson, D. O. ; Wormley, S. J. ; Hsu, D. K.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 57 (1986), S. 3089-3098

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: An automated multiviewing ultrasonic apparatus and signal processing routine have been developed for utilization in nondestructive evaluation (NDE) of materials. The instrument has been developed to take advantage of recent advances in long and intermediate wavelength inverse scattering of elastic waves, and provides a 3-D reconstruction of a flaw. Although the reconstruction obtained does not contain fine details of the flaw's structure, it provides sufficient information about the flaw (size, orientation, and selected materials properties) so that failure-predictive decisions can be made.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1139211

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Digitale Medien

Study of the transit time of pressure propagation in an acoustic delay line (1986)

Song, Yunn-Fang ; Chen, Ching-Iue ; Chang, Chu-Nan ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 57 (1986), S. 3063-3065

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A fast sensor was used as a vacuum gauge to measure the transit time of a gas pressure through an acoustic delay line (ADL). The results were compared with the predictions of two theoretical models. We found that in the rupture pressure range of 101 to 104 Pa, the predictions of Jean and Rauss' model, based on the assumption that the flow of gas be a gas fluid, set lower boundaries for the observed transit times; while the predictions of our model, based on the molecular motion, set the upper ones.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1138992

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