Measurement of microwave radiation pressure on thin metal fibers

IF 0.1 Q4 INSTRUMENTS & INSTRUMENTATION
Mykola Kokodii, S. Berdnik, V. Katrich, M. Nesterenko, I. Priz, A. Natarova, V. Maslov, Konstantin Muntian
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引用次数: 1

Abstract

The pressure of electromagnetic radiation in the optical range is widely used to hold microparticles in a given place and control their movement. This is possible by focusing the laser radiation into an area with the dimension of several micrometers. The intensity of radiation in this area is large and sufficient to retain micro-particles in the laser beam and manipulate them. Nowadays, intensive research is underway on the use of microwave and terahertz radiation and the possibility of applying radiation pressure in these ranges. But in the microwave range, the focal spot dimension is much larger than in the optical one. Therefore, control of the objects whose dimensions are comparable to those of the focal spot using the radiation pressure requires very high power. For the objects with small dimensions, a small amount of radiation energy falls on them, and the acting force decreases. However, it is known that thin conductive fibers interact very strongly with microwave radiation. This can be used to levitate short thin metal fibers (vibrators), hold them in predicted place and control their position in space. The paper describes the measurements of the pressure of microwave radiation with a wavelength of 8 mm on thin copper fibers. Torsional balance is used for this purpose. In the metal case on a suspension from a tungsten fiber with a diameter of 8 microns there is located the rocker arm with 50 mm length with receiving elements in the form of system of copper fibers with a diameter of 300 microns and 15 mm length. Microwave radiation was directed to one of the receiving elements using a horn. The calibration of torsion balance, the measurement process, and the evaluation of the resulting error are described. The measurements gave the value of the efficiency factor of the radiation pressure Qpr = 4.86. This agrees satisfactorily with the results of calculations Qpr = 5.39. The difference is 10%.
薄金属纤维微波辐射压力的测量
光学范围内的电磁辐射的压力被广泛用于将微粒保持在给定的位置并控制其运动。这可以通过将激光辐射聚焦到具有几微米尺寸的区域中来实现。该区域的辐射强度很大,足以将微粒保留在激光束中并对其进行操纵。如今,正在对微波和太赫兹辐射的使用以及在这些范围内施加辐射压力的可能性进行深入研究。但在微波范围内,焦斑的尺寸比在光学范围内大得多。因此,使用辐射压力来控制其尺寸与焦斑的尺寸相当的物体需要非常高的功率。对于尺寸较小的物体,少量的辐射能量落在它们身上,作用力减小。然而,已知薄导电纤维与微波辐射的相互作用非常强烈。这可以用来悬浮短而薄的金属纤维(振动器),将它们固定在预定的位置,并控制它们在太空中的位置。本文描述了在薄铜纤维上测量波长为8mm的微波辐射的压力。扭转平衡用于此目的。在由直径为8微米的钨纤维制成的悬浮体上的金属壳体中,设置有长度为50mm的摇臂,该摇臂具有直径为300微米、长度为15mm的铜纤维系统形式的接收元件。使用喇叭将微波辐射导向其中一个接收元件。介绍了扭转天平的校准、测量过程以及由此产生的误差的评估。测量结果给出了辐射压力的效率因子Qpr=4.86的值。这与计算结果Qpr=5.39完全一致。差异为10%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ukrainian Metrological Journal
Ukrainian Metrological Journal INSTRUMENTS & INSTRUMENTATION-
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