Impedance stroke volume - A comparison in dogs and man with electromagnetic flowmeters and dye dilution respectively
Measurement of stroke volume by electrical impedance, electromagnetic flowmeter, and dye solution methods
Martin, W. E.↗
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Results for “dyes”
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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Development and qualification of the Apollo sea dye marker
Performance of Apollo sea dye marking powder
Bricker, R. W.↗
Dye penetrant for surfaces subsequently contacted by liquid oxygen Patent
Dye penetrant and technique for nondestructive tests of solid surfaces contacted by liquid oxygen
Giles, R. M. F.↗
Predicting the relative dye layer densities of color infrared transparencies
Graphical method for deriving dye-layer densities of color infrared image elements from known reflectance curves, and analysis of CIR photography from spacecraft windows
Pease, R. W.↗
Enhancement of absorption spectra by dye-laser quenching
Absorption spectra enhancement by organic dye laser quenching, considering applications for absorbing species spectroscopic detection
Bass, A. M.↗
Mode locking of the CW dye laser
CW dye laser mode locking with lithium niobate phase modulator, observing 500 psec pulse generation
Kuizenga, D. J.↗
Electronic tuning of a dye laser using the acousto-optic filter
Dye laser electronic tuning by inserting calcium-molybdenum oxide acousto-optic filter into cavity
Hansch, T. W.↗
Study of excitation transfer in a flowing helium afterglow pumped with a tuneable dye laser. 1: Measurement of the rate coefficient for selected quenching reactions involving he(5 3P)
A system is described for the measurement of excited state reaction times in the nanosecond range. A flowing afterglow produces large populations of chemically unstable species, and a pulsed, tuneable dye laser is used to selectively pump these into the reacting excited state. The transient fluorescence from the populations of reactants and end products is used to determine reaction lifetimes and yields. This radiatron is collected with a photon counting system which logs arrival times of spectrally dispersed photons with 10 nanosecond resolution.
Collins, C. B.↗
Study of excitation transfer in flowing helium afterglow pumped with a tuneable dye laser. 2: Measurement of the rate coefficient for the rotational relaxation of He2(3p (3 Pi g))
The rotational relaxation of the He2(3p(3pi g)) state is examined by optically pumping a flowing helium afterglow with a tuneable dye laser. The population of the J = 8 rotational state is enhanced by optically saturating the R sub 7 component of the transition connecting this state with the metastable He2(2s (3 Sigma u +)) molecular state. From the lifetime and yield of the Q sub 7 component, the rate coefficient for the rotational relaxation via the forbidden delta J = 1 channel is determined to be of the order of 2 x 10 to the minus 11th power cm3/sec. It is found that this represents about half of the total rate of rotational relaxation in this state.
Collins, C. B.↗
Dye penetrant indications caused by superficial surface defects in 2014 aluminum alloy welds.
Demonstration that dye penetrant indications on the heat-affected zone of 2014-T6 aluminum GMA weldments are frequently caused by superficial surface conditions and are less than 0.007 in. deep. The following methods are suggested for minimization of these surface defects: stabilization of the arc, application of dc ?GTA' welding procedures, reduction of the caustic etch time, and use of fine grain materials.
Hocker, R. G.↗
A laser head for simultaneous optical pumping of several dye lasers
Device accomplishes simultaneous optical pumping using single flashlamp and electrical driver. Dye lasers require relatively low energy to operate (low-threshold pumping requirement) and provide simple method for producing simultaneous independent laser output at number of different wavelengths.
Mumola, P. B.↗
Dye laser remote sensing of marine plankton
Dye laser, emitting four wavelengths sequentially in time, has been incorporated into helicopter-borne lidar flight package, for performing studies of laser-induced fluorescence of chlorophyll A in algae. Data obtained by multicolor lidar technique can provide water-resource management with rapid-access wide-area coverage of the impact of various environmental factors for any body of water.
Mumola, P. B.↗
Trinity Bay Study: Dye tracing experiments
An analysis of the heat balance and temperature distribution within Trinity Bay near Galveston, Texas is presented. The effects of tidal currents, wind driven circulations, and large volume inflows are examined. Emphasis is placed on the effects of turbulent diffusion and local shears in currents. The technique of dye tracing to determine the parameters characterizing dispersion is described. Aerial photographs and maps are provided to show the flow conditions existing at different times and seasons.
Ward, G. H., Jr.↗
Study of excitation transfer in a flowing helium afterglow pumped with a tuneable dye laser. II - Measurement of the rate coefficient for the rotational relaxation of He2/3p 3Pi-g/.
The results of the use of a fast-transient fluorescence technique in the examination of rotational relaxation caused by collisions with neutral helium atoms are discussed. Details regarding the production and detection of reacting species are considered, together with the analytical method used. A dye laser system with 4-methylcoumarin producing a pumping flux in the 4650 A region was employed in the investigations.
Collins, C. B.↗
Dye laser tuning with pellicles.
Thin nitrocellulose membranes (pellicles) are shown to exhibit properties which make them suitable for intracavity tuning elements in high-energy pulsed dye lasers. Uncoated pellicles of 2-micron and 8-micron thickness with surface figures of lambda/1 are shown to closely approximate the properties of low-finesse etalons with wide free spectral ranges. Pellicles of 8-micron thickness, coated on both surfaces with 50% reflectivity multilayer dielectrics, are shown to be effective as spectral narrowing elements with peak transmission greater than 80% and resultant laser linewidths of 0.57 nm full width at half-maximum.
Mumola, P. B.↗
Study of excitation transfer in laser dye mixtures by direct measurement of fluorescence lifetime
By directly measuring the donor fluorescence lifetime as a function of acceptor concentration in the laser dye mixture Rhodamine 6G-Cresyl violet, we found that the Stern-Volmer relation is obeyed, from which the rate of excitation transfer is determined. The experimental results indicate that the dominant mechanism responsible for the efficient excitation transfer is that of resonance transfer due to long range dipole-dipole interaction.
Lin, C.↗
Stimulated Stokes emission with a dye laser - Intense tuneable radiation in the infrared
Tunable stimulated Stokes emission is generated at approximately 2.9 microns in barium vapor with an oscillator-amplifier dye laser. The conversion efficiency is as high as 40% and the energy output as high as 30 mJ. The emission is tuneable over about 100 wavenumbers. At high vapor pressures the tuning profile is markedly asymmetric.
Carlsten, J. L.↗
Dye fading test for mission control operator console displays
A dye fading test of 40 days duration was conducted to determine the effect of mission control operator console and ambient lighting effects on a series of photographic products under consideration for use in mission console operator consoles. Six different display samples, each containing 36 windows of several different colors, were prepared and placed in the mission control consoles for testing. No significant changes were recorded during the testing period. All changes were attributed to a mechanical problem with the densitometer. Detailed results are given in graphs.
Lockwood, H. E.↗