Handheld wave-absorbing material reflectivity measuring device

Abstract

The invention provides a handheld wave-absorbing material reflectivity measuring device. The handheld wave-absorbing material reflectivity measuring device comprises a metal test platform, a to-be-measured sample plate or a standard sample plate, a supporting cover, an arched guide rail, a near-field focusing antenna, a wave-absorbing partition plate, sliding blocks, a lifting rod, a push-pull rod and a receiving and transmitting module. According to the handheld wave-absorbing material reflectivity measuring device, the near-field focusing antenna which is a novel double-antipodal structure Vivaldi antenna replaces a horn antenna to serve as a receiving and transmitting antenna, the antenna is small in size and weight, and has the low standing-wave ratio in a wide band, the high gain and the low side lobe characteristic, a near-field linear polarization plane wave can be generated, the far-field radiation environment is simulated on a near field, a test area moves from an antenna far-field area to an antenna near-field area, and test space is reduced; due to reduction of the distance between the to-be-measured sample plate and the antenna, the to-be-measured sample plate can be more intensively irradiated through an electromagnetic wave, and the influence of background reflectance on the test accuracy is reduced; meanwhile, electromagnetic wave incidence and a reflection angle can be accurately adjusted, the accuracy of a receiving-and-transmitting antenna positioning angle is improved, and the complex rate of operation is reduced.

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 method for testing the reflectivity of the absorbing material is RAM (Radar Absorbing Material) reflectivity far-field RCS (Rader Cross Section) test Method, RAM reflectivity sample space translation test method, RAM reflectivity bow test method, etc. Among them, the bow test method is the main method re...

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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