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Showing papers on "Fiber optic sensor published in 1971"


Journal ArticleDOI
TL;DR: The effective transmission of the source brightness was calculated as a function of the f numbers of the entrance and output optics of the fiber, and these results were used to choose a suitable optical system for illumination of a spectrometer.
Abstract: Absolute and angular transmission measurements were made on a single sheathed fiber 0.15 mm in diameter and 2.1 m long, and an optical angular transfer function was defined and calculated. The effective transmission of the source brightness was calculated as a function of the f numbers of the entrance and output optics of the fiber, and these results were used to choose a suitable optical system for illumination of a spectrometer.

5 citations



30 Sep 1971
TL;DR: In this article, a baseline model for an optical data link utilizing a single fiber bundle was established, which is solely concerned with light interface technology (LIT) for digital signal transmission, and was characterized by the pulse amplitude, pulse rise and fall times, pulse delay, and signal-to-noise ratio of the photodiode output.
Abstract: : The report establishes a baseline model for an optical data link utilizing a single fiber bundle. This model is solely concerned with light interface technology (LIT) for digital signal transmission. Data link performance is characterized by the pulse amplitude, pulse rise and fall times, pulse delay, and signal-to-noise ratio of the photodiode output. The LIT link has been analyzed as an entirety considering four major areas; light emitting diodes, fiber optic light guide, fiber optic/diode interface, and photodiode. Fiber optic/diode interface has been investigated with regard to loss mechanisms of coupling light into and out of fiber bundles. Fiber optic light guides have been surveyed and evaluated. The three major types that have been given consideration are total internal reflection fibers, total internal refraction fibers and waveguide mode fibers. Space division multiplexing investigations considering Lambertian sources were completed for the TIR and SELFOC fiber types. Number of channels possible, optical cross coupling of fibers, and sampling effect are the main topics discussed. Analog properties of a typical link were investigated with respect to distortion. Experiments were completed using various wavelength LEDs and at various temperatures. (Author)

1 citations


Journal ArticleDOI
TL;DR: In this article, a technique based on the use of fiber optics in conjunction with an optical sensor and amplifier is described for detecting the first indication of light output after the application of a stimulus.
Abstract: Functioning time of an explosive device can be defined as the first indication of light output after the application of a stimulus. A technique based on the use of fiber optics in conjunction with an optical sensor and amplifier is described.