A Terahertz Antenna Applied in Coal Mine Borehole Detection

Abstract

The invention discloses a terahertz antenna applied to detection in a coal mine hole and belongs to the field of antenna design. The terahertz antenna is arranged on a coal mine drill rod. The terahertz antenna utilizes multiple layers of paraboloids as reflecting surfaces, wherein the paraboloids have the same focus, and the difference of the focal lengths of the paraboloids is nlambda / 2 (lambda is the wave length corresponding to a central work frequency, and n is an integer). The terahertz antenna utilizes an opened circular waveguide as a feed source, a rectangle-circle transition waveguide, a 90-degree H surface bent waveguide and a standard flange plate are connected to the rear of the terahertz antenna, and an antenna cover made of fiber reinforce plastic materials is used for protection. The terahertz antenna applied to detection in the coal mine hole has the advantages of being high in gain and extremely narrow in wave beam, and high-resolution imaging can be achieved. The whole antenna is small in size, compact in structure, capable of being used as a front end antenna of a terahertz detection system, and capable of being integrated into the drill rod and going deep into a drill hole to carry out detection work, small fractures or other substances in the coal mine hole can be accurately detected, water inrushing accidents caused by the fractures and other factors can be effectively prevented, and production safety of coal mines is ensured.

Description

technical field [0001] The invention belongs to the field of antenna design, and specifically relates to the design of a terahertz antenna used for detection in coal mine holes. Background technique [0002] In recent years, my country's coal mine production safety accidents have occurred frequently, which has aroused widespread concern in the society, among which mine water damage has become a major hidden danger restricting coal mine safety production. Water inrush in "old kilns and goafs" accounts for the vast majority of water damage accidents, which are mostly caused by tiny cracks on the mine surface. Therefore, it is the key to prevent mine water damage to be able to effectively detect cracks in mine holes. [0003] The detection accuracy of the instruments used in the current mine detection system is not enough, such as the direct current method, transient electromagnetic method, audio-frequency electrotransmission method, and the detection depth of the seismic metho...

AI Technical Summary

Problems solved by technology

[0006] Problems solved by the technology of the present invention: In order to overcome the shortcomings of the existing detection technology such as insufficient precision, insufficient depth, inability to detect in the hole, and the above-mentioned high-frequency loss of the antenna or incompatibility with the drill pipe, it provides a small, compact, A low-loss, wide-band terahertz antenna that can be easily combined with coal mine drill pipes for detection in coal mine holes. The antenna has the characteristics of high gain and extremely narrow beam, and can be applied to terahertz imaging systems with high-resolution imaging characteristics In, as the transmitting and receiving front end of the electromagnetic signal

Images