scholarly journals Determination of the wavelength of zero material dispersion in optical fibres by pulse-delay measurements

1977 ◽  
Vol 13 (21) ◽  
pp. 627 ◽  
Author(s):  
D.N. Payne ◽  
A.H. Hartog
Keyword(s):  
Optical Fibres ◽  
Material Dispersion ◽  
Pulse Delay

scholarly journals Time domain reflectrometry measurements using a movable obstacle for the determination of dielectric profiles

2008 ◽  
Vol 6 ◽  
pp. 1-4
Author(s):  
B. Will ◽  
M. Gerding ◽  
S. Schultz ◽  
B. Schiek
Keyword(s):  
Dielectric Constant ◽  
Water Content ◽  
Time Domain ◽  
Measurement Techniques ◽  
Measurement Data ◽  
Time Domain Reflectometry ◽  
Dielectric Measurement ◽  
Effective Dielectric Constant ◽  
Pulse Delay

Abstract. Microwave techniques for the measurement of the permittivity of soils including the water content of soils and other materials, especially TDR (time domain reflectometry), have become accepted as routine measurement techniques. This summary deals with an advanced use of the TDR principle for the determination of the water content of soil along a probe. The basis of the advanced TDR technique is a waveguide, which is inserted into the soil for obtaining measurements of the effective soil permittivity, from which the water content is estimated, and an obstacle, which can mechanically be moved along the probe and which acts as a reference reflection for the TDR system with an exactly known position. Based on the known mechanical position of the reference reflection, the measured electrical position can be used as a measure for the effective dielectric constant of the environment. Thus, it is possible to determine the effective dielectric constant with a spatial resolution given by the step size of the obstacle displacement. A conventional industrial TDR-system, operating in the baseband, is used for the signal generation and for the evaluation of the pulse delay time of the obstacle reflection. Thus, a cost effective method for the acquisition of the dielectric measurement data is available.

The determination of the refractive index profile in α-profile optical fibres by intermodal interference investigation

Optik ◽  
2004 ◽  
Vol 115 (2) ◽  
pp. 86-88 ◽  
Author(s):  
I. Martinček ◽  
D. Káčik ◽  
I. Turek ◽  
P. Peterka
Keyword(s):  
Refractive Index ◽  
Refractive Index Profile ◽  
Optical Fibres ◽  
Index Profile

scholarly journals Variation of pulse delay with stress and temperature in jacketed and unjacketed optical fibres

1979 ◽  
Vol 11 (3) ◽  
pp. 265-273 ◽  
Author(s):  
A. H. Hartog ◽  
A. J. Conduit ◽  
D. N. Payne
Keyword(s):  
Optical Fibres ◽  
Pulse Delay
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