J
John U. White
Researcher at Esso
Publications - 9
Citations - 1529
John U. White is an academic researcher from Esso. The author has contributed to research in topics: Spectrometer & Grating. The author has an hindex of 7, co-authored 9 publications receiving 1484 citations.
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Journal ArticleDOI
Long Optical Paths of Large Aperture
TL;DR: In this article, an absorption cell is described, in which the light traverses a small volume a large and arbitrarily variable number of times, and the angular aperture of the mirrors is not occulted either on or off the optical axis, and can be used for observing spectra that are very weak, or that belong to high boiling point compounds or to compounds obtainable only in very low concentrations.
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Very long optical paths in air
TL;DR: In this paper, two different multiple traversal optical systems are described; one gives the longest paths, the other the best compensation for vibration and misalignment problems, and the possible numbers of passes are (4mn − 2)k + 2, where m and n are any integers representing, respectively, the number of columns and half the number in the array.
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Photoelectric Raman spectrometer
TL;DR: In this article, a photoelectric Raman spectrometer was built for the measurement of small liquid and gas samples, employing a 1200-line per millimeter replica grating, it can record a complete Raman spectrum in six minutes and a more accurate one in an hour.
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A Long Path Gas Absorption Cell
Robert G. Pilston,John U. White +1 more
TL;DR: In this paper, a long path gas absorption cell is described for infrared analyses of components of extremely low concentrations and absorption coefficients, which can either be evacuated or pressurized, with a peak efficiency of 45 percent of incident energy at 10 meters.
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New Method for Measuring Diffuse Reflectance in the Infrared
TL;DR: In this paper, the source and sample are placed at conjugate foci of a hemispherical mirror with the chopper between the source source and mirror, making the component reflected by the sample distinguishable from the one emitted by it.