Downhole pulse radar

Patent · 31 December 1988

OSTI ID:866890

Chang, Hsi-Tien ^[1]

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1. Albuquerque, NM

A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole.

• Research Organization: AT & T CORP
• DOE Contract Number: AC04-76DP00789
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4814768
• OSTI ID: 866890
• Country of Publication: United States
• Language: English

Related Subjects

/342/324/
30
300
active
active region
antenna
antennas
barium
barium titanate
borehole
borehole logging
broad
diameter
directional
discontinuities
distribution
downhole
duration
electromagnetically
energy
energy distribution
fast
fast rise-time
generates
geological
logging
logging tool
magnitude
mhz
peak-power
pulse
pulse radar
radar
radar pulse
receiving
receiving antenna
reduce
region
returns
rise-time
sampled
titanate
tool
transmission
transmitting
uphole
wavelength