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Jan 2003

Volume 74, Issue 1, pp. 1-912

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A vertical inertial coarse approach for variable temperature scanned probe microscopy

William R. Silveira and John A. Marohn

Rev. Sci. Instrum. 74, 267 (2003); http://dx.doi.org/10.1063/1.1524712 (3 pages) | Cited 7 times

Online Publication Date: 16 January 2003

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We have developed a variable temperature inertial coarse approach mechanism for use in scanned probe microscopy. This reliable micropositioner has a coarse range of 2.5 mm and can take individual steps of less than 10 nm from 4 to 300 K. This simple, compact device is both nonmagnetic and glueless. It is operational in both horizontal and vertical geometries and is driven by a low voltage sawtooth waveform. We report on the design and performance of the device. © 2003 American Institute of Physics.
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07.79.Lh Atomic force microscopes
06.60.Sx Positioning and alignment; manipulating, remote handling

Modified Michelson fiber-optic interferometer: A remote low-coherence distributed strain sensor array

Libo Yuan

Rev. Sci. Instrum. 74, 270 (2003); http://dx.doi.org/10.1063/1.1525867 (3 pages)

Online Publication Date: 16 January 2003

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A simple modified Michelson fiber-optic low-coherence interferometric quasi-distributed sensing system permitting absolute length measurement in remote reflective sensor array is proposed. The sensor reflective signals characteristics have been analyzed and the relationship between light signal intensities and sensors number was given for multiplexing potential evaluation. The proposed sensing scheme will be useful for the remote measurement of strain. An important application could be deformation sensing in smart structures. Experimentally, a three sensors array has been demonstrated. © 2003 American Institute of Physics.
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42.81.Pa Sensors, gyros
07.60.Vg Fiber-optic instruments
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
07.10.Pz Instruments for strain, force, and torque
07.60.Ly Interferometers
42.25.Kb Coherence
06.30.Bp Spatial dimensions (e.g., position, lengths, volume, angles, and displacements)

Environmental chamber for powder x-ray diffractometers for use at elevated pressures and low temperatures

A. F. Koster van Groos, Stephen Guggenheim, and Curt Cornell

Rev. Sci. Instrum. 74, 273 (2003); http://dx.doi.org/10.1063/1.1525868 (3 pages) | Cited 6 times

Online Publication Date: 16 January 2003

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An elevated-pressure, low-temperature environmental chamber was developed for the Bruker (Siemens) D-5000 theta-theta goniometer-based powder x-ray diffractometer. With minor modifications, the chamber is applicable to all models of theta-theta goniometers from any manufacturer. The chamber is capable of pressures to about 100 bars and temperatures from −50 °C to 200 °C (with silicone seals), based on conservative best estimates. Diffractometer scans may be made between 0° and 70° two theta. © 2003 American Institute of Physics.
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07.35.+k High-pressure apparatus; shock tubes; diamond anvil cells
07.85.Jy Diffractometers
61.05.cp X-ray diffraction

Lifetime measurement and calibration from pressure-sensitive paint luminescence images

T. F. Drouillard, M. A. Linne, L. P. Goss, J. R. Gord, and G. J. Fiechtner

Rev. Sci. Instrum. 74, 276 (2003); http://dx.doi.org/10.1063/1.1527201 (3 pages) | Cited 1 time

Online Publication Date: 16 January 2003

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A dual-image lifetime technique for acquiring surface pressure measurements from pressure-sensitive paint image data has been developed. This technique eliminates the need to acquire a “wind-off” reference image as required by the traditional radiometric technique, which is known to corrupt results. Here a luminescence lifetime-versus-pressure calibration experiment was conducted. Uncertainty was nominally less than ±4% and decreased as signal level increased. The nominal sensitivity was less than ±5 Torr at 100 Torr, less than ±50 Torr at 700 Torr, and improved with signal level. © 2003 American Institute of Physics.
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06.20.F- Units and standards
78.60.Mq Sonoluminescence, triboluminescence
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