Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"Photometer"”.
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The design and construction of a new density photometer
Thesis: B.S., Massachusetts Institute of Technology, Department of Electrochemical Engineering, 1923
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Design, construction, & calibration of a sixty-inch integrating sphere photometer
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science, 1932
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Optical remote sensing of thermospheric emission with the Sky-Calibrated Imaging Photometer
… and analysis of the Sky-Calibrated Imaging Photometer (SCIP). SCIP is a new ground-based instrument with the novel capability of absolute brightness calibration using astronomical sources. The derivation of the emission line brightness from a two-channel photometer is presented, followed by …
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A study of the practicability of the photometer method in making soil loss measurements
… may be drawn from this investigation: (1) The photometer is an accurate and dependable device for measuring light absorption by turbid soil and water solutions when the soil particles are of nearly constant size. The tests made with the soil that had passed through a 100-mess sieve proved this …
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Auroral arc detection using a COTS spectral photometer for the Auroral Emission Radio Explorer (AERO) CubeSat Mission
Auroral phenomena are dynamic in nature: observed events have rich structures that are both spatially and temporally complex, with scientifically interesting features. While optical auroral observations using CCDs or all-sky cameras are common, the aurora also have interesting emission properties …
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Development of a Water Cloud Radiance Model for Use in Training an Artificial Neural Network to Recover Cloud Properties from Sun Photometer Observations
… of inferring cloud properties from sun photometer observations of the cloud solar aureole using an artificial neural network (ANN). Training of an ANN requires a large number of input and output parameter sets. A cloud radiance model is derived that takes into consideration the cloud …
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Optical studies of the mesospheric region
A three-field photometer has been employed at the University of Adelaide's Buckland Park field site to collect optical observations of the 557.7nm OI and 730nm OH airglow emissions. Data have been collected on an almost continuous basis since May 1995 through to May 2000, with observations made …
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Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca)
… the total ammonia nitrogen (TAN) measured by photometer test kits is crucial as inaccuracies could result in major losses of abalone on the farms. The accuracy and applicability of two frequently used photometer test kits (the Nesslers method and the Palintest method) were compared. The …
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Black Carbon Measurements of Snow and Ice Using the Single Particle Soot Photometer: Method Development and an AD 1852-1999 Record of Atmospheric Black Carbon from a Mount Logan Ice Core
… in snow and ice using the Single Particle Soot Photometer (SP2). Results suggest the optimal procedures for sample storage, treatment, and nebulization, and analysis and calibration of BC concentrations measured using the SP2 coupled to a CETAC ultrasonic nebulizer. The methods were then used to …
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Fluctuating concentrations in atmospheric dispersion
… source. These measurements included both aerosol photometer records of the instantaneous concentration taken at a 1 Hz sampling rate and aspirated filters for mean concentration measurements.
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Absorption of sunlight by atmospheric sodium
A photometer has been built which is sensitive only to light in a very narrow spectral region near the sodium D-line8. The light is scattered by sodium vapour at low density and the scattered light recorded by a photoelectric spectrometer. The latter resolves the two lines and allows the effect of …
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Uv-Visible Microscope Spectrophotometric Polarization And Dichroism With Increased Discrimination Power In Forensic Analysis
… microscope and sample and then is detected by a photometer detector (photomultiplier tube) to systems in which broad-band (white light) illumination falls incident upon a sample followed by a non-scanning grating spectrometer equipped with a solid-state multi-element detector. Most of these small …
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The direct measurement of system Modulation Transfer Function (MTF) for an AN/AVS-6 Aviator's Night Vision Imaging System (ANVIS)
… technique and uses a Photo Research PR-900 video photometer as the detector. Comparisons between the direct measurement and the component combination calculation demonstrate the accuracy of the direct measurement.
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Assessment of Black Carbon in Snow and Ice from the Tibetan Plateau and Pacific Northwest
… black carbon (BC) using a Single Particle Soot Photometer (SP2). From the ice core, the high-resolution BC record displayed substantial variability, a 2-fold increase in peak concentrations from 1853-1930 to 1930-1983, and a 1.6-fold increase in average concentrations from 1853-1975 to …
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Standard magnitude sequences in the Harvard standard regions at -45° declination
… employing the Fabry method and a photoelectric photometer, respectively, are described in some detail. A special series of observations was made to ensure that the nine E regions have the same zero point. Accurate photographic and photovisual magnitudes were obtained for about 270 of the …
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Investigating spatial variation in the surface and atmosphere of Pluto through stellar occultations and PSF photometry
… the ground testing of the High-speed Imaging Photometer for Occultations (HIPO), a camera aboard the Stratospheric Observatory For Infrared Astronomy (SOFIA). Differential photometry was found to be reliable to one part in 104. The second project is a modern determination of the light ratio of …
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Post-wildfire black carbon deposition on the snowpack in the Cascade Range, Washington State: Temporal and spatial variability with implications for accelerated melt
… were measured using a Single Particle Soot Photometer (SP2), gravimetric filtration, and spectroradiometer analysis. These analyses demonstrate that the greatest BC deposition is localized to high burn severity areas, and decreases significantly within ten years of a wildfire. …
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150 Years of Light Absorbing Impurity Deposition on South Cascade Glacier, Washington State USA
… and BC was measured using a Single Particle Soot Photometer (SP2). Background and peak BC concentrations increased over the top third of the core, peaking at a depth of 52 meters. Concentrations decreased gradually over the lower two thirds of the core, with the higher concentrations indicating …
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Case Studies of IMF Driven Auroral Emissions
… Data was obtained via a meridian scanning photometer, CCD spectrograph, and NASA's WIND & ACE satellites. The wavelet power spectrums of the auroral emissions and satellite data were compared to identify events of interest. The observed time lags from the power spectrums were then compared …
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