Patent · US Active

Transillumination of the subsurface, method of cavity detection and detection configuration

US11221396B2 · kind B2 · utility

1Cited by

8References

13Claims

0Family size

Assignee

Diehl Defence GmbH & Co. KG · DE

Inventors

Robert Stark · Bad Windsheim, DE
Frank Sonnemann · Koblenzer Straße, DE
Helmut Hofmann · Sandhausen, DE

Key dates

Filing date	Jun 17, 2019
Grant date	Jan 11, 2022
Priority date	—
Expiry date	Jul 7, 2040

Classification

Technology area (CPC G)Physics
CPC primaryG01N22/00
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

In a method for generating a transillumination signal of a section of the subsurface, an HPEM radiation source radiates an electromagnetic pulse into the section for the purpose of exciting electromagnetically reactive structures to emit an electromagnetic response signal. For the pulse, a pulse duration of at most 500 ns, a center frequency in the range between 10 MHz and 10 GHz, and a bandwidth in the range from 10% to 150% of the center frequency is set. The transillumination signal is formed as the sum of response signals received at a measuring location. In a method for detecting a cavity in the subsurface, the above method is carried out, and the structures are detected from the transillumination signal with the aid of a detection method, and the cavity is detected if the structures satisfy a detection criterion.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.