RSI Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue

Dec 1986

Volume 57, Issue 12, pp. 2925-3139

Page 1 of 2 Pages Next Page | Jump to Page

Pulsed metastable atomic beam source for time‐of‐flight applications

A. Kohlhase and S. Kita

Rev. Sci. Instrum. 57, 2925 (1986); http://dx.doi.org/10.1063/1.1139018 (4 pages) | Cited 10 times

Full Text: | Download PDF

Show Abstract
A metastable atomic beam source was developed utilizing pulsed helium and argon nozzle beams. A coaxial electron gun, which can be used in a pulsed as well as in a continuous mode, excites the noble gases to their metastable states by electron bombardment in the direction of propagation of the ground‐state atoms. In contrast to former work, the electron beam is controlled and accelerated by a combination of three hemispherically shaped tungsten grids. With continuous electron gun operation the source produces a metastable flux of about 1015 atoms/sr s for helium and argon under optimum expansion conditions. Applying short electrical pulses to a control grid yields supersonic metastable atom pulses, with velocity distributions having a relative width as low as 3.8% for helium and 6.5% for argon ( FWHM ) with a 100% modulation of the metastable beams. These features make the source applicable for velocity analyzed scattering experiments using the time‐of‐flight technique.
Show PACS
07.77.-n Atomic, molecular, and charged-particle sources and detectors
34.80.Dp Atomic excitation and ionization
52.50.Dg Plasma sources
52.80.Tn Other gas discharges

Radial field discharge for high‐flux ion extraction

S. Humphries and L. K. Len

Rev. Sci. Instrum. 57, 2929 (1986); http://dx.doi.org/10.1063/1.1139019 (6 pages) | Cited 1 time

Full Text: | Download PDF

Show Abstract
Experimental results are described on a pulsed plasma source for the generation of intense beams of intermediate mass ions. The source used radial magnetic field and axial electric field to trap a high density of electrons on azimuthal orbits. A self‐sustained discharge was maintained with high probability for ionization of injected gas. The large extraction area and narrow discharge gap allowed high current operation and effective extraction of ions. Up to 50 A of argon ions were generated over a 100‐μs pulse. The total discharge current was 100 A and the voltage was 1000 V. A current density of 1 A/cm2 argon ions was measured 2 cm from the discharge gap.
Show PACS
07.77.-n Atomic, molecular, and charged-particle sources and detectors
52.80.Tn Other gas discharges
41.75.Ak Positive-ion beams
41.75.Cn Negative-ion beams
52.25.Kn Thermodynamics of plasmas

Accelerator for ion beams using triangle‐shaped accelerated waves

M. Kawaguchi, M. Sasahara, T. Noritake, and H. Enjoji

Rev. Sci. Instrum. 57, 2935 (1986); http://dx.doi.org/10.1063/1.1139020 (5 pages)

Full Text: | Download PDF

Show Abstract
An accelerator for ion beams has been designed and constructed in which ions collectively undergo acceleration in the wells of a train of triangle‐shaped potential waves moving with a constant acceleration. The accelerator mentioned above is planned for investigating the conditions necessary for acceleration of ions with a mass distribution, such as cluster ions, which will be available in future fusion reactors. The method and the circuits for generations of propagating accelerated waves are described and the structure of the accelerator with an acceleration space 120 cm long is mentioned. A result is reported on a preliminary experiment for acceleration of an argon ion beam, which shows that the accelerator works well.
Show PACS
29.20.-c Accelerators
41.75.Ak Positive-ion beams
41.75.Cn Negative-ion beams

Multidipole confinement of argon and potassium plasmas

Robert A. Bosch and Robert L. Merlino

Rev. Sci. Instrum. 57, 2940 (1986); http://dx.doi.org/10.1063/1.1139021 (11 pages) | Cited 3 times

Full Text: | Download PDF

Show Abstract
Multidipole confinement of an argon discharge plasma and a potassium plasma produced by surface ionization was investigated. In both cases, a large volume of uniform density quiescent plasma was produced in the central region of low magnetic field strength. Measurements of electron and ion densities and space potentials suggest that self‐consistent electrostatic fields resulted in crossfield (to B) ion confinement and that the cusp leak widths were determined by a noncollisional mechanism (e.g., Bohm diffusion). A comparison of the nondischarge potassium plasmas produced with and without multidipole confinement indicates that the ion confinement time was improved by a factor of ∼15 by the multidipole magnetic field.
Show PACS
52.55.Lf Field-reversed configurations, rotamaks, astrons, ion rings, magnetized target fusion, and cusps
52.80.Tn Other gas discharges

Light‐integrating cylinder for inertial confinement fusion light balance measurements in mirror illumination systems

J. D. Simpson, D. J. Drake, and T. Speziale

Rev. Sci. Instrum. 57, 2951 (1986); http://dx.doi.org/10.1063/1.1139022 (6 pages) | Cited 2 times

Full Text: | Download PDF

Show Abstract
This report describes the design and operation of a diagnostic instrument used for light balance measurements in inertial fusion experiments. The instrument is a light‐integrating cylinder that uses the integrating principles of the Ulbricht sphere, but which was designed to operate in a reflective illumination environment. The cylinder has been used to make measurements with both high‐absorption disk targets and low‐absorption foil targets, illuminated with 20–80 J of green (527‐nm) light. We have also modeled the cylinder to determine its theoretical integrating performance under a variety of operating conditions. Initial sensitivity was measured at 0.4 V/J and degraded over target shot number to about 0.25 V/J. The instrument has a measurement accuracy of 10% for scattered light and an absorption measurement accuracy of 10% for strongly absorbing targets, and 30%–70% for weakly absorbing targets.
Show PACS
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.25.Os Emission, absorption, and scattering of electromagnetic radiation

Reentrant cavity as a low‐power plasma source

M. R. Brown, T. E. Sheridan, and M. A. Hayes

Rev. Sci. Instrum. 57, 2957 (1986); http://dx.doi.org/10.1063/1.1139023 (4 pages) | Cited 5 times

Full Text: | Download PDF

Show Abstract
A low‐power source of plasma employing ECRH microwave breakdown in a reentrant cavity is described. The cavity has the following features: its dimensions can be made much smaller than its resonant wavelength, cavity Q values of several hundred are not difficult to achieve, and the vacuum rf electric field is uniform near its center. The plasma density to power ratio is roughly 109 cm−3 per watt for powers up to about 10 W. A smooth radial profile and a temperature of 5–10 eV are observed, and the plasma is very quiescent (δn/n is less than 1%). The cavity’s construction and performance is described and compared to the performance of a simple loop antenna in a nonresonant structure.
Show PACS
52.50.Dg Plasma sources
52.80.Pi High-frequency and RF discharges

Critical field index for passive coil stabilization of the spheromak shift instability

G. C. Goldenbaum, R. A. Hess, and R. S. Shaw

Rev. Sci. Instrum. 57, 2961 (1986); http://dx.doi.org/10.1063/1.1139024 (5 pages) | Cited 2 times

Full Text: | Download PDF

Show Abstract
The physics of a shifting spheromak plasma inside a passive stabilization coil is examined. Criteria for the design of these coils are derived for various spheromak current distributions. For realistic coils and force‐free plasmas a critical field index is derived, above which the coils are ineffective.
Show PACS
52.55.Fa Tokamaks, spherical tokamaks
52.55.Pi Fusion products effects (e.g., alpha-particles, etc.), fast particle effects
52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)

Gyro‐electron ghost images due to microchannel‐plate operation in transverse magnetic fields

A. L. Roquemore and S. S. Medley

Rev. Sci. Instrum. 57, 2966 (1986); http://dx.doi.org/10.1063/1.1139025 (4 pages) | Cited 1 time

Full Text: | Download PDF

Show Abstract
A multianode microchannel‐plate (MCP) detector was operated in a transverse magnetic field. When a collimated ion beam of ∼4 mm diameter impinged on one area of the plate, ghost images were observed elsewhere on the plate at anodes up to several centimeters from the beam spot. This effect is due to secondary electrons which are emitted from the interstitial surfaces around the MCP pores and returned to the surface of the plate under the influence of E×B fields, where E is the electric field perpendicular to the plate due to the MCP bias potential and B is the externally applied transverse magnetic field. A regenerative process is observed in which the secondary electrons traverse the surface of the plate in the E×B direction by successive gyro‐orbit steps. A method for suppressing the ghost images is discussed.
Show PACS
29.40.-n Radiation detectors

High repetition long pulse XeCl laser with a coaxial ceramic pulse‐forming line

Shuntaro Watanabe, Masayoshi Watanabe, Akira Endoh, and Tsukasa Sato

Rev. Sci. Instrum. 57, 2970 (1986); http://dx.doi.org/10.1063/1.1139026 (4 pages) | Cited 4 times

Full Text: | Download PDF

Show Abstract
A coaxial pulse‐forming line using ceramic as a dielectric material has been developed for excitation of a long pulse XeCl laser. The dielectric constant of 1700 enabled a compact low‐impedance pulse‐forming line (PFL) with an electric transit time of 260 ns/m. A 200‐ns optical pulse has been produced with an output energy of 240 mJ from a 2×2×28‐cm3 active region. The use of a magnetic switch rather than a nontriggered rail gap improved dramatically the high repetition rate capability, jitter, and reproducibility of the optical pulse shape, which are essential for practical use. The jitter was within 2 ns and the fluctuation in the output energy was ±3%.
Show PACS
42.55.Lt Gas lasers including excimer and metal-vapor lasers
42.60.Da Resonators, cavities, amplifiers, arrays, and rings

Compact CdSe laser with microminiature cryogenic refrigerator

B. Valk, D. J. Olson, and M. M. Salour

Rev. Sci. Instrum. 57, 2974 (1986); http://dx.doi.org/10.1063/1.1139027 (2 pages)

Full Text: | Download PDF

Show Abstract
A microminiature refrigeration system allowing precise temperature control above 77 K has been tested successfully as a compact Dewar to achieve the necessary cryogenic temperatures to operate optically pumped semiconductor lasers in an external cavity. Using this system in a mode‐locked CdSe laser resulted in a stable average output power of up to 10 mW. Tunability from 7015 to 7160 Å was achieved by changing the temperature from 77 to 111 K.
Show PACS
42.60.By Design of specific laser systems
07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment

High‐temperature, alkali–rare‐gas optical cell

D. E. Johnson and J. G. Eden

Rev. Sci. Instrum. 57, 2976 (1986); http://dx.doi.org/10.1063/1.1139028 (3 pages)

Full Text: | Download PDF

Show Abstract
A new type of optical cell is described which is designed specifically for work with alkali– rare‐gas mixtures. Comprised of commercially available components, the cell is capable of operating at 950 K and rare‐gas pressures greater than an atmosphere.
Show PACS
07.60.-j Optical instruments and equipment
51.70.+f Optical and dielectric properties
42.79.-e Optical elements, devices, and systems

Ultraviolet and visible single‐shot autocorrelator based on multiphoton ionization

O. L. Bourne and A. J. Alcock

Rev. Sci. Instrum. 57, 2979 (1986); http://dx.doi.org/10.1063/1.1139029 (4 pages) | Cited 7 times

Full Text: | Download PDF

Show Abstract
The construction and performance of a simple and compact single‐shot autocorrelator suitable for use in both the UV and visible regions of the optical spectrum is described. This device has a temporal range of over 500 ps with a lower limit of 25 ps. Some suggestions are made to reduce this lower limit to the subpicosecond domain.
Show PACS
42.79.-e Optical elements, devices, and systems
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
33.80.Wz Other multiphoton processes
32.80.Wr Other multiphoton processes

Method to compensate laser fluctuation in photon correlation spectroscopy

K. Ohbayashi, T. Kohno, Y. Fukino, and G. Terui

Rev. Sci. Instrum. 57, 2983 (1986); http://dx.doi.org/10.1063/1.1139030 (4 pages)

Full Text: | Download PDF

Show Abstract
A method to compensate the laser power fluctuation in the photon correlation spectroscopy has been developed. In the method, as the key TTL IC element, rate multipliers are used to modulate the sequential digital photoelectron pulses by the parallel digital signal which is processed to be proportional to the inverse of the incident laser intensity. Details of the circuit design are given. To show the usefulness of the method, a case is illustrated in which the ac line noise is compensated in the observation of the Brownian motion of polystyrene latex spheres suspended in water. The bandwidth of the method is estimated to be about 180 kHz.
Show PACS
07.57.Ty Infrared spectrometers, auxiliary equipment, and techniques
07.60.Rd Visible and ultraviolet spectrometers
07.05.Bx Computer systems: hardware, operating systems, computer languages, and utilities
07.05.Hd Data acquisition: hardware and software
07.05.Kf Data analysis: algorithms and implementation; data management
07.05.Rm Data presentation and visualization: algorithms and implementation
07.50.Ek Circuits and circuit components

Improving measurement accuracies in cross‐talk optical sensors

Lucjan Grochowski, Wojciech J. Bock, and John W. Lit

Rev. Sci. Instrum. 57, 2987 (1986); http://dx.doi.org/10.1063/1.1139212 (5 pages)

Full Text: | Download PDF

Show Abstract
A compensation method, applied to sensors based on cross talk to measure physical parameters such as temperature, strain, and pressure, can improve their accuracies by at least an order of magnitude. This method uses an additional coupler that compensates the effects produced in the measuring coupler. The balance is achieved by means of a closed optoelectric feedback loop to reduce the noise, resulting in higher measuring accuracies.
Show PACS
42.81.Pa Sensors, gyros
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
42.15.Eq Optical system design
42.87.-d Optical testing techniques

Low‐temperature, high‐pressure optical system with a compact diamond‐anvil cell and a closed‐cycle refrigerator

Hiroshi Tanino

Rev. Sci. Instrum. 57, 2992 (1986); http://dx.doi.org/10.1063/1.1138980 (3 pages) | Cited 3 times

Full Text: | Download PDF

Show Abstract
An optical system for low‐temperature high‐pressure measurements of polarized absorption, reflectance, and luminescence with a compact diamond‐anvil high‐pressure cell, a closed‐cycle helium refrigerator, and toroidal mirrors to focus on the sample is described. It enables us to get a temperature–pressure diagram of optical spectra easily and rapidly in the region between 200 nm and 14 μm at 15–300 K at pressures up to about 100 kbar with in situ monitoring of pressure by the ruby fluorescence method.
Show PACS
42.15.Eq Optical system design
42.87.-d Optical testing techniques
07.60.-j Optical instruments and equipment
07.35.+k High-pressure apparatus; shock tubes; diamond anvil cells

Diode‐array spectrometer (DAPS) for visible and near‐IR absorption measurements with 10‐ns time resolution

Josef Sedlmair, S. Gwyn Ballard, and David C. Mauzerall

Rev. Sci. Instrum. 57, 2995 (1986); http://dx.doi.org/10.1063/1.1138981 (9 pages) | Cited 8 times

Full Text: | Download PDF

Show Abstract
This paper describes a diode‐array pulsed spectrometer (DAPS) that performs flash photolysis studies with a time resolution of 10 ns and a spectral resolution of 2.4 nm over a 600‐nm wavelength window in the range of 350–1100 nm. It employs a 1024‐element photodiode‐array detector with high dynamic range and low noise. Laser‐pumped fluorescent dye mixtures are used as a novel, stable light source which enable it to record spectra with a photolimited S/N ratio equivalent to 0.001 abs. units in a single shot. The measuring light distribution can be tailored so that a constant S/N ratio across a spectrum is attainable even in regions of high absorbance. Electrical artifacts from the actinic laser or other discharges do not interfere with the measurement and the effects of scattered actinic light and fluorescence from the sample are minimized. The instrument is simple to build, using mainly standard lab equipment, and easy to maintain and operate.
Show PACS
82.80.Dx Analytical methods involving electronic spectroscopy
82.80.Ej X-ray, Mössbauer, and other γ-ray spectroscopic analysis methods
07.60.Rd Visible and ultraviolet spectrometers
07.57.Ty Infrared spectrometers, auxiliary equipment, and techniques
82.40.-g Chemical kinetics and reactions: special regimes and techniques

Operating experience with a GaAs photoemission electron source

F. C. Tang, M. S. Lubell, K. Rubin, A. Vasilakis, M. Eminyan, and J. Slevin

Rev. Sci. Instrum. 57, 3004 (1986); http://dx.doi.org/10.1063/1.1138982 (8 pages) | Cited 25 times

Full Text: | Download PDF

Show Abstract
We report on the development of several operating procedures that promise to make GaAs photoemission electron sources easier to construct, more reliable to operate, and more amenable to use in dynamic vacuum systems. We describe in particular a method for ‘‘ohmically’’ heating a 〈100〉 crystal of GaAs under vacuum to approximately 600 °C. We also discuss our observations of the role of oxygen in the activation of the crystal surface, the use of continuous cesiation, and of the performance of the crystal under varying vacuum conditions.
Show PACS
07.77.-n Atomic, molecular, and charged-particle sources and detectors
81.65.-b Surface treatments
41.75.Fr Electron and positron beams

A new system for LEED intensity measurements using a real‐time digital video processor

D. F. Ogletree, G. A. Somorjai, and J. E. Katz

Rev. Sci. Instrum. 57, 3012 (1986); http://dx.doi.org/10.1063/1.1138983 (7 pages) | Cited 9 times

Full Text: | Download PDF

Show Abstract
A new system for low‐energy electron diffraction (LEED) intensity measurements has been developed using a video camera and digital processing of the video signal. Complete two‐dimensional LEED patterns are digitized in real time with high resolution using a commercial video processor. Intensity‐voltage (I‐V) data on all beams in complex LEED patterns are collected simultaneously. A microcomputer analysis program automatically tracks the diffraction beams as a function of energy and calculates beam position, size, and integrated intensity, including a local background correction. Using a video tape recorder for intermediate data storage, a complete set of I‐V curves can be collected in less than 100 s.
Show PACS
61.05.jh Low-energy electron diffraction (LEED) and reflection high-energy electron diffraction (RHEED)

Measurement of small electrical forces using a torsion balance and capacitive position transducer

L. I. Winkler

Rev. Sci. Instrum. 57, 3019 (1986); http://dx.doi.org/10.1063/1.1138984 (5 pages) | Cited 4 times

Full Text: | Download PDF

Show Abstract
A method for measuring the force arising from the attraction between a charged electrode and another electrode on which charges have been induced has been developed using a torsion balance operated in the ac mode far above the resonance frequency of the balance. The movement of the balance is sensed by a capacitive position transducer which uses two lock‐in amplifiers to demodulate the position signal. The balance itself and the position transducer are described. The sensitivity of the position transducer is given, and results from three electrode geometries are discussed.
Show PACS
07.10.-h Mechanical instruments and equipment
07.50.-e Electrical and electronic instruments and components
41.20.Cv Electrostatics; Poisson and Laplace equations, boundary-value problems
41.20.Gz Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems

Noise characteristics of U. S. synchrotron radiation sources

L. Powers

Rev. Sci. Instrum. 57, 3024 (1986); http://dx.doi.org/10.1063/1.1138985 (3 pages) | Cited 2 times

Full Text: | Download PDF

Show Abstract
Noise characteristics of the U. S. x‐ray synchrotron sources are compared in the 0–2.5‐kHz region. In general, little difference is found in the characteristic frequencies of the noise on focused and unfocused beamlines of a particular source, but the magnitude and white‐noise levels differ. The National Synchrotron Light Source shows the least characteristic noise and the noise that is observed is small in magnitude (2–3 times the white‐noise level).
Show PACS
29.20.db Storage rings and colliders
29.20.-c Accelerators

In situ calibrations of grazing incidence vacuum monochromators for x‐ray laser research

H. Milchberg, C. H. Skinner, S. Suckewer, and D. Voorhees

Rev. Sci. Instrum. 57, 3027 (1986); http://dx.doi.org/10.1063/1.1138986 (4 pages) | Cited 1 time

Full Text: | Download PDF

Show Abstract
In situ relative and absolute calibrations are described for two grazing incidence vacuum monochromators used in our ongoing x‐ray laser experiments. The soft x‐ray sources used in the calibrations are small plasmas produced by a specially constructed portable vacuum spark generator and by irradiating thin (∼100–300 μm diameter) carbon fibers with a high‐power (1–5 GW, 1012–1013 W/cm2) CO2 laser. The absolute instrumental sensitivities have been determined using the method of branching ratios, while the relative calibrations have been done by simultaneously monitoring given ionic lines with each XUV instrument.
Show PACS
07.85.-m X- and γ-ray instruments
07.60.Rd Visible and ultraviolet spectrometers

Computer‐controlled data‐acquisition system for an x‐ray spectrometer

J. M. André, C. Cardinaud, P. Chargelegue, F. Marcelet, and C. Sénémaud

Rev. Sci. Instrum. 57, 3031 (1986); http://dx.doi.org/10.1063/1.1138987 (3 pages) | Cited 1 time

Full Text: | Download PDF

Show Abstract
A data‐acquisition system, controlled by an Apple IIe microcomputer, designed for a bent crystal, vacuum spectrometer is described. A specific interface performing the photon counting via a programmable counter timer and the detector position encoding through a 12‐bit analog‐to‐digital converter is coupled to the microcomputer bus by an 8‐bit parallel interface. An outline of the software in advanced and machine language is given.
Show PACS
07.05.Bx Computer systems: hardware, operating systems, computer languages, and utilities
07.05.Hd Data acquisition: hardware and software
07.05.Kf Data analysis: algorithms and implementation; data management
07.05.Rm Data presentation and visualization: algorithms and implementation
07.85.-m X- and γ-ray instruments

Versatile macroscale heat flow calorimeter for the study of chemical processes

Gerald W. Stockton, Susan J. Ehrlich‐Moser, Dale H. Chidester, and Richard S. Wayne

Rev. Sci. Instrum. 57, 3034 (1986); http://dx.doi.org/10.1063/1.1138988 (9 pages) | Cited 4 times

Full Text: | Download PDF

Show Abstract
A novel macroscale calorimeter has been designed and fabricated for the purpose of evaluating the thermodynamic and kinetic properties of chemical reactions, especially those associated with industrial manufacturing processes. This calorimeter includes provisions for isothermal and temperature‐programmed operation over a wide range of temperatures, simultaneous or sequential addition of several reagents, and variable‐rate agitation. The metal reaction vessel can be removed from the main housing of the calorimeter, permitting the use of vessels made from various materials for optimum corrosion resistance. Heat transfer takes place only through the base of the vessel, ensuring that the thermal efficiency remains independent of the sample volume. A novel computer control algorithm provides precise control of the reaction temperature, as well as low‐noise measurement of heat flux. The observed detection threshold is 50 mW and a heat flux of several hundred watts can be dissipated. Provisions for simultaneous measurement of other properties, such as pH, make the calorimeter especially useful for small scale piloting of chemical processes.
Show PACS
07.20.Fw Calorimeters

Fiber‐optic liquid contact measurements in pool boiling

S. Neti, T. J. Butrie, and J. C. Chen

Rev. Sci. Instrum. 57, 3043 (1986); http://dx.doi.org/10.1063/1.1138989 (5 pages) | Cited 4 times

Full Text: | Download PDF

Show Abstract
Two optical techniques for use in detecting liquid contacts in film and transition boiling regimes were developed. The first optical method involves the measurements of liquid contacts on a high‐temperature glass boiling surface in a transient experiment. The second technique utilizes a small fiber‐optic probe mounted flush on a copper surface. Experiments have indicated the probe is sufficiently fast responding to provide accurate local measurements of liquid to solid contact in film and transition boiling regimes. The relationship between surface superheat and liquid contact time fraction was determined for both methods.
Show PACS
42.81.Pa Sensors, gyros
42.87.-d Optical testing techniques
68.08.-p Liquid-solid interfaces
68.43.-h Chemisorption/physisorption: adsorbates on surfaces
44.30.+v Heat flow in porous media

Method of precision temperature control using flowing water

Hiromitsu Ogasawara

Rev. Sci. Instrum. 57, 3048 (1986); http://dx.doi.org/10.1063/1.1138990 (5 pages) | Cited 3 times

Full Text: | Download PDF

Show Abstract
A high‐precision temperature control method using flowing water near room temperature is described in this paper. The temperature of a thermostatic cell immersed in a water flow within a water jacket is regulated by controlling the temperature of the water circulating through the jacket. This control is accomplished by three‐step controlled heating and constant cooling. The method provides control with a short response time. Temperature stabilization‐process control within a fluctuation of ±25 μK over a period of 12 h and temperature variation‐process control at a rate of 320 μK/h with a fluctuation of less than ±50 μK are achieved. All of the electric devices for controlling and measuring, as well as the thermostatic cell, are placed in thermostatic containers the temperature of which is controlled within a fluctuation of ±0.05 K. The total error in these temperature measurements is estimated to be approximately ±11 μK.
Show PACS
07.20.-n Thermal instruments and apparatus
47.80.-v Instrumentation and measurement methods in fluid dynamics
Page 1 of 2 Pages Next Page | Jump to Page
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close