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Jun 1990

Volume 61, Issue 6, pp. 1579-1760

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Low dead volume piezoelectric valve

Dan Marinescu

Rev. Sci. Instrum. 61, 1749 (1990); http://dx.doi.org/10.1063/1.1141146 (2 pages) | Cited 2 times

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By using a capillary tube as both seat and exit duct in a commercial piezoelectric valve, the outlet dead volume is reduced by more than three orders of magnitude. The described modification also makes a separation between the gas flow and the actuator chamber which considerably extends the choice of working gases.
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85.50.-n Dielectric, ferroelectric, and piezoelectric devices

Development of a fast scanning frequency meter for the Ka band

Michio Otsuka and Masashi Shimizu

Rev. Sci. Instrum. 61, 1750 (1990); http://dx.doi.org/10.1063/1.1141147 (3 pages) | Cited 1 time

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A fast scanning frequency meter was developed for frequency measurements of microwaves generated in the pulsed gyrotron. The heterodyne technique, using a voltage controlled oscillator (VCO) as the local oscillator, was utilized in order to shorten the measuring time. The frequency coverage of this meter is in the range of 26.5–31.2 GHz. The minimum measuring time is 100 μs(10 kHz) with a measurement error of less than ±23 MHz.
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52.55.Fa Tokamaks, spherical tokamaks
84.30.Le Amplifiers

Characterization of a large superconducting split pair magnet for swept field measurements

A. G. Crockett and T. A. Kennedy

Rev. Sci. Instrum. 61, 1753 (1990); http://dx.doi.org/10.1063/1.1141950 (3 pages)

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A Hall probe was inserted into the magnet of an optically detected magnetic resonance (ODMR) spectrometer to study residual field at zero current, homogeneity, and hysteretic effects. Residual fields were on the order of 10 mT at zero current. The magnet was homogeneous to within one part in 8000 or better over a region of 2.5 cm along its vertical axis. Several hysteresis loops were studied for field sweeps. The largest shifts were about 10 mT. Using the information collected, recommendations are made on how to improve precise field measurements for ODMR.
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84.71.Ba Superconducting magnets; magnetic levitation devices

A high‐pressure cylindrical internal reflection cell for infrared spectroscopy

Seiji Sawamura, Hiroshi Kamaya, and Issaku Ueda

Rev. Sci. Instrum. 61, 1756 (1990); http://dx.doi.org/10.1063/1.1141148 (2 pages) | Cited 1 time

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A high‐pressure cylindrical internal reflection cell is designed for use with water and aqueous solutions. The oil separator is a glass piston‐cylinder type and is placed in the cell. The infrared absorption spectra of water are measured up to 30 MPa. This pressure is three times higher than the previously reported cell.
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07.57.Ty Infrared spectrometers, auxiliary equipment, and techniques

Pitot tube as a calibration device for turbulence measurement

Sadek Z. Kassab

Rev. Sci. Instrum. 61, 1757 (1990); http://dx.doi.org/10.1063/1.1141095 (3 pages)

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This note is to demonstrate that one can correct hot‐wire turbulence measurements simply by using a Pitot tube to obtain the mean velocity distribution in fully developed, turbulent pipe flow. The basic idea is simply a combination of two independent derivations given in the late sixties. A test case is given to prove the idea.
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47.80.-v Instrumentation and measurement methods in fluid dynamics

Integrated inductance bridge package for ac susceptibility measurements of superconducting thin films

E. Polturak, L. Wilen, D. Cohen, and G. Koren

Rev. Sci. Instrum. 61, 1759 (1990); http://dx.doi.org/10.1063/1.1141096 (2 pages)

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We describe a simple integrated self‐inductance bridge package for measuring the ac susceptibility of high‐Tc superconducting thin films. The package has good sensitivity and baseline drift rejection, and employs mechanical clamping for easy sample interchange.
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74.78.-w Superconducting films and low-dimensional structures
74.70.-b Superconducting materials other than cuprates
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