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THE SPATIAL SENSITIVITY OF TIME-DOMAIN REFLECTOMETRY
Soil Science, 1989With any method for measuring soil water content it is useful to know the spatial sensitivity of the measurement, i.e., what volume of soil is measured and what the distribution of sensitivity is within that volume.
J. M. BAKER, R. J. LASCANO
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Time Domain Reflectometry Uses In Geotechnical Engineering
18th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2005Time Domain Reflectometry (TDR) makes use of a device that propagates transverse electromagnetic waves through soils by means of special soil probes as shown in Figure 1 for field testing and in Figure 2 for testing a specimen. For field testing four spikes are driven into the soil while for testing a specimen in a mold, only a center rod is driven ...
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Advances in optical time domain reflectometry
Journal of Lightwave Technology, 1989Advances in optical time-domain reflectometry (OTDR), such as enlargement of dynamic range, enhancement in resolution, reduction of noise intrinsic to single-mode fibers, and increase in user friendliness of the equipment, are reviewed. The gated detection technique and recent progress in OTDR are presented.
M. Tateda, T. Horiguchi
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On the time referencing problem in time domain reflectometry
Journal of Physics E: Scientific Instruments, 1981In dielectric time domain reflectometry (TDR) a crucial point in the evaluation of the Fourier transforms of the incident and reflected pulses is the establishment of a common time origin t0. Ideally the TDR system should operate in a self contained way without the requirement of separate instruments or measurements to indirectly define t0.
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Dielectric measurements by time domain reflectometry
Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1975, 1975Transient or “time domain” methods have become of considerable interest in the last few years because of the availability of fast pulse generators and sampling oscilloscopes permitting measurements in the range 10−11 to 10−7 seconds, corresponding to frequencies from a few megahertz to a few gigahertz.
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Raman time-domain reflectometry
Integrated Optics and Optical Fiber Communication, 1981L. Stensland, G. Borak
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Time domain reflectometry in the micrometer range
1987The subpicosecond OTDR has been investigated as a diagnostic tool for the fiber optics components and integrated waveguide devices. The mode-locked dye laser at 1.3 μm was excited by Nd-YAG compressed pulses. 300 fsec pulses have been generated at the rate of 82 MHz.
Novak, R. P. +5 more
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