Millimetre-wave reflectometer

被引：1

作者：

Appleby, R ^{[1
]}

Leeks-Musselwhite, M ^{[1
]}

机构：

[1] QinetQ, Malvern WR14 3PS, Worcs, England

来源：

INFRARED AND PASSIVE MILLIMETER-WAVE IMAGING SYSTEMS: DESIGN, ANALYSIS, MODELING, AND TESTING | 2002年 / 4719卷

关键词：

millimetre; polarisation; reflectivity;

D O I：

10.1117/12.477466

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper describes a reflectometer, which can operate at either 35 or 94GHz. A broadband signal is produced by a modulated noise source in either vertical or horizontal polarisation. After reflection by the sample under test a superheterodyne receiver detects this signal. The noise source and the receiver are mounted on two opposed 0.5m parabolic antennas. These antennas are supported on arms, which can be rotated by stepper motors under computer control. The computer also controls the data logging system, which consists of a lock-in amplifier and analogue to digital converter. This instrument allows reflectivity to be measured for incidence angles from 20 to 70degrees down to a minimum of 0.05%, which is sufficient to measure diffuse reflection.

引用

页码：402 / 408

页数：7

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