Hand-held absorbing material reflectance measuring device

Abstract

The invention provides a handheld reflectance measuring device for absorbing materials, including: a metal test platform, a sample to be tested or a standard sample, a support cover, a bow-shaped guide rail, a near-field focusing antenna, a wave-absorbing partition, a slider, a lifting rod, Push-pull rod, transceiver module; the present invention adopts the near-field focusing antenna—the new double-heel structure Vivaldi antenna to replace the horn antenna as the receiving and transmitting antenna. Gain, low side lobe characteristics, can generate near-field linearly polarized plane waves, simulate the far-field radiation environment in the near field, and move the test area from the far-field area of ​​the antenna to the near-field area of ​​the antenna, reducing the test space. The distance between the test sample and the antenna is shortened, and the electromagnetic wave can irradiate the test sample more concentratedly, which reduces the influence of background reflection on the test accuracy; at the same time, the incident and reflection angles of electromagnetic waves can be adjusted precisely, which improves the accuracy of the positioning angle of the receiving and transmitting antennas. performance, reducing the operational complexity.

Description

technical field [0001] The invention relates to the field of reflectivity measurement of absorbing materials, in particular to a method that can reduce the test space and operation complexity while ensuring the test accuracy, and is suitable for on-site testing of absorbing materials coated on metal surfaces. Hand-held device for measuring the reflectivity of absorbing materials. Background technique [0002] With the rapid development of high technology, absorbing materials have been widely used. In order to study the absorbing material in depth, we need to find a method that can measure the absorbing performance of the absorbing material more accurately. The commonly used methods for testing the reflectivity of the absorbing material are RAM (Radar Absorbing Material) reflectivity far-field RCS (Radar Absorbing Material) Cross Section) test method, RAM reflectance sample space translation test method, RAM reflectance bow test method, etc. Among them, the bow test method i...

AI Technical Summary

Problems solved by technology

There are following disadvantages based on this method: 1. The horn antenna and the supporting bow frame and its driving motor have high cost, large volume, heavy weight, complicated installation and debugging, and relatively low accuracy in positioning angles of receiving and transmitting antennas. Poor; 2. The sample to be tested needs to be placed in a uniform plane wave area, and the plane wave area radiated by the horn antenna is located in the radiation far field area; at the same time, the distance R between the receiving and transmitting antennas via the material reflection path must meet the following conditions:

Due to the large diameter of the horn antenna, its radiation far-field area is far away from the antenna, resulting in a large test space; The back and forth reflection of the ground around the test system will generate a large interference signal, so a layer of high-performance absorbing material needs to be laid on the ground around the test system to reduce the background reflection of the test system, which also increases the test space and cost; 4. When the absorbing material to be tested has been coated on missiles, aircraft and ships, the traditional test system cannot be tested

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