Multiedge slitter for FCC
Tool cuts multiple slits up to 3 in. long between conductors of flat conductor cables up to 3 in. wide to prepare them for termination on terminal boards or in multipin connectors.
Tucker, D. T.↗
SEARCH · Engineering Papers
Results for “slit”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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The horizontal component of spicule motion
Spicule horizontal component motion from H alpha spectra movies with slit tangential to solar limb
Weart, S. R.↗
Optical shutter for use in shock tubes
Thin metal shutter that is forced into angled optical slit isolates spectrograph from high speed shock tube both optically and mechanically so neither radiation nor particulate material enters spectrograph.
Mcclenahan, J. O.↗
Improved optical filters for automated visual inspection
Sides of spatial filter slits are shaped so that their contribution to signal is reduced, thus minimizing the number of scanning errors.
Curtis, D. A.↗
Development of a position sensitive X-ray detector for use in a light weight X-ray diffractometer
A position sensitive proportional counter for use in an X-ray diffractometer is developed to permit drastic reductions in the power and weight requirements of the X-ray source and the elimination of the power, weight, and complexity of a moving slit. The final detector constructed and tested has a window spanning 138 and a free standing anode curved along an arc of 7.1 cm radius. Demonstration spectra of a quartz sample in a Debye-Sherrer geometry indicate a spatial resolution of 0.4 - 0.5 mm (0.3 - 0.4 theta). The lunar diffractometer consumed 25 watts in the X-ray generator and weighed about 20 pounds.
Semmler, R. A.↗
Application of Monte Carlo techniques to optimization of high-energy beam transport in a stochastic environment
An algorithm employing a modified sequential random perturbation, or creeping random search, was applied to the problem of optimizing the parameters of a high-energy beam transport system. The stochastic solution of the mathematical model for first-order magnetic-field expansion allows the inclusion of state-variable constraints, and the inclusion of parameter constraints allowed by the method of algorithm application eliminates the possibility of infeasible solutions. The mathematical model and the algorithm were programmed for a real-time simulation facility; thus, two important features are provided to the beam designer: (1) a strong degree of man-machine communication (even to the extent of bypassing the algorithm and applying analog-matching techniques), and (2) extensive graphics for displaying information concerning both algorithm operation and transport-system behavior. Chromatic aberration was also included in the mathematical model and in the optimization process. Results presented show this method as yielding better solutions (in terms of resolutions) to the particular problem than those of a standard analog program as well as demonstrating flexibility, in terms of elements, constraints, and chromatic aberration, allowed by user interaction with both the algorithm and the stochastic model. Example of slit usage and a limited comparison of predicted results and actual results obtained with a 600 MeV cyclotron are given.
Parrish, R. V.↗
Spatial and spectral studies of solar phenomena
Work proceeded simultaneously in four different areas of solar research. These were: (1) assembly and testing of the components of a multiple-slit H alpha spectrograph, (2) simultaneous observations of the wings of the H alpha line with a newly modified filter, (3) analysis of H alpha high resolution observations in conjunction with magnetic field observations obtained at Kitt Peak, and (4) theoretical analysis of the D3 line HeI.
Harvey, K. L.↗
Services provided in support of the planetary quarantine requirements
Results are presented of laboratory experiments conducted on the thermal resistance of naturally occurring airborne spores and microbiological examinations of space hardware using long-term slit samplers and rodac plate and swab-rinse methods of sampling environmental surfaces.
Favero, M. S.↗
OAO-2 observations of C III 1909 A line in gamma 2 Velorum
The C III 1909 A emission line in gamma 2 Velorum was observed over a period of 24 hours in an attempt to find short period time variability. Analysis of this data found no periods in the range of 0.5 to 200 minutes, and placed an upper limit of 3% on the amplitude of the stellar pulsations. Improved spectral resolution data for this line was obtained by offsetting the OAO-2 pointing in steps of 15 seconds of arc. The line profile derived by combining this offset data with the slit function shows a definite asymmetry. Although the improved resolution gives results which are barely sufficient for comparison with the prediction from model envelopes, some information concerning the abundance of carbon and the physical conditions of the envelope can be gained.
West, D. K.↗
A pressure scanning Fabry-Perot magnetometer.
Description of an oscillating magnetic analyzer (KDP crystal plus Glan-Thompson prism) coupled to an echelle-interferometer spectrograph, and of single-slit magnetometer which by pressure variations can be made to scan the entire profiles of the circularly and linearly polarized Zeeman components. Freon gas is used as the scanner gas with wavelength displacements of 0.02 A per 0.1 in. Hg pressure change at the NaD lines. The available scan range is 15 A in the visual spectral region.
Fay, T. D.↗
Observing Venus near the sun.
Discussion of the special requirements posed by telescopic observing near the sun. The sky brightness in the image plane must be kept to a minimum. Sunlight scattered from dust in the atmosphere or on the optical surfaces is the main difficulty, particularly at red and infrared wavelengths where Rayleigh scattering by air molecules is weak. Atmospheric dust is less troublesome at high altitudes and in dry climates than at low, humid sites. Excellent seeing is required, especially to get the thin crescent of Venus at inferior conjunction into the narrow slit of a spectrograph. The spectroscopic phase effect of Venus is discussed, and the procedures used to carry out observations near the sun are described in detail.
Young, A. T.↗
A circumferential crack in a cylindrical shell under tension.
A closed cylindrical shell under uniform internal pressure has a slit around a portion of its circumference. Linear shallow shell theory predicts inverse square-root-type singularities in certain of the stresses at the crack tips. This paper reports the computed strength of these singularities for different values of a dimensionless parameter based on crack length, shell radius and shell thickness.
Duncan-Fama, M. E.↗
An image-tube scanner for the Wisconsin echelle spectrograph.
The slit and multiplier tube of the spectrograph are replaced by an intensifier tube scanner. Two data-collection schemes are described. Results and future directions are discussed as is an application to rockets.
Mcnall, J. F.↗
URSIES - An ultravariable resolution single interferometer echelle scanner.
Use of a Fabry-Perot interferometer in a Ramsay mount in tandem with an echelle Hilger monochromator with pinholes instead of slits. The instrument, URSIES, is enclosed within a pressure chamber filled with Freon. Photoelectric pulse counting techniques and pressure scanning are used to record the spectrum. This design has four basic advantages: (1) the resolution of the scanner is variable from 5.0 to 0.005 A, and the effective wavelength range is quite broad, from 3500 to 13,000 A; (2) a light gain of ten over conventional grating scanners at resolutions of 0.1 A or better is achieved; (3) very low levels of light from outside the wavelength passband reach the detector; for a resolution of 0.03 A at 6000 A this level is 5%; and (4) there are very low levels of scattered light from the pinholes when extended sources are observed. The scattered light from the instrument at the edge of the solar disk is found to be less than 1% from 4000 to 11,000 A. Measurements demonstrating these advantages are discussed.
Wyller, A. A.↗
The emission-line velocity field in M82.
A slit-spectrum study of the apparent velocity field in the peculiar galaxy M82 (NGC 3034) has been completed. Velocity curves were measured from the emission lines of H-alpha, forbidden N II, and forbidden S II, and a contour map of the emission-line velocity field has been constructed. The observations are interpreted from the standpoint that either (1) the radiation which we see in the direction of the filamentary structure is intrinsic to the filaments or, more likely, (2) the radiation originates at the apparent optical nucleus and is subsequently scattered by dust in the filaments. The conclusion is reached that the ejected material, which is probably expanding away from the central region of the galaxy, must have velocity components which are not directed radially with respect to the apparent optical nucleus. The observations imply that the expanding cloud of ejecta is rotating about an axis roughly perpendicular to the fundamental plane of the galaxy even at distances as large as 45 arc seconds from the apparent nucleus of the galaxy.
Heckathorn, H. M.↗
Detection of crystals in CO2 jet plumes.
It is shown that the electron diffraction technique is well suited for studying condensation effects in low-density flows. The possibility of improving the sensitivity and resolution of the detector by using electron multipliers and by increasing the slit distance is examined.
Beylich, A. E.↗
A high-speed spectrograph shutter
Device can operate in close-open-close mode. Beam splitter placed behind static-slit assembly allows use of more than one camera. Each frame in particular series may be conveniently varied in exposure time and spacing. This can be done independent of other frames in the series. In ''open'' position, shutter transmits light over wide wavelength range.
Miller, M. H.↗
Procedure for rapid determination of nickel, cobalt, and chromium in airborne particulate samples
A rapid, selective procedure for the determination of 1 to 20 micrograms of nickel, chromium, and cobalt in airborne particulates is described. The method utilizes the combined techniques of low temperature ashing and atomic absorption spectroscopy. The airborne particulates are collected on analytical filter paper. The filter papers are ashed, and the residues are dissolved in hydrochloric acid. Nickel, chromium, and cobalt are determined directly with good precision and accuracy by means of atomic absorption. The effects of flame type, burner height, slit width, and lamp current on the atomic absorption measurements are reported.
Davis, W. F.↗