Method and apparatus for identifying the distribution of the dielectric constants in an object

US4805627A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Klaus Klingenbeck · Aufseß, DE
• Judith Regn · Koblenzer Straße, DE

Key dates

• Filing date: Sep 4, 1986
• Grant date: Feb 21, 1989
• Expiry date: Sep 4, 2006

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N22/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and apparatus for identifying the distribution of the dielectric constants in an object employ radiation emitted by a microwave transmitter directed at the object, which radiation is received by a microwave detector array. The dielectric constant distribution is calculated in a computer from the output signal of the detector array, and is represented on a monitor. The transmitted and scattered radiation is acquired by the array in a prescribed volume in terms of amplitude and phase. For this purpose, the array has a surface with detector elements thereon which is linearly displaceable in a direction toward the microwave transmitter in steps along a selected path. At each step, the incoming radiation is identified in terms of amplitude and phase at a plurality of measuring locations, the number of measuring locations corresponding to the number of individual detector elements within the array. This measuring phase is thereafter combined with a calibration phase for further processing.