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首页> 外文期刊>Proceedings of the IEE - Part C: Monographs >An instrument for the absolute measurement of low-level microwave power in the 3 cm band
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An instrument for the absolute measurement of low-level microwave power in the 3 cm band

机译：绝对测量3 cm波段中低电平微波功率的仪器

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The paper describes an instrument termed the `vibration wattmeter???????? which consists of a cavity in which is suspended a thin metal rod mounted on a fine glass spindle with a quartz fibre suspension. The rod is free to execute torsional oscillations in the horizontal plane. The oscillating system receives periodic impulses from the interaction between the metal rod and the electromagnetic field within the cavity, and by the automatic switching of the microwave source a steady amplitude of mechanical oscillations can be maintained. The amplitude of these oscillations is measured by means of a small mirror attached to the spindle and a lamp-and-scale arrangement. The relationship between the power delivered to the cavity and the amplitude of the mechanical oscillations can be found theoretically, and with knowledge of the specific couple of the quartz fibre suspension and of the damping factor of the mechanical system, measurements of power can be made. The instrument measures microwave power with an error estimated as not exceeding ???????±2%. The measurement is absolute, since the calibration depends only on measurements of mass, length and time.
机译：该论文描述了一种称为“振动功率计”的仪器。它由一个空腔组成，在该空腔中悬挂着一根细金属杆，该杆安装在带有石英纤维悬浮液的细玻璃心轴上。杆可在水平面内自由执行扭转振荡。振荡系统从金属棒和空腔内的电磁场之间的相互作用中接收周期性的脉冲，并且通过自动切换微波源，可以保持机械振荡的稳定幅度。这些振荡的幅度是通过一个安装在主轴上的小镜子和一个灯和刻度装置来测量的。从理论上可以找到传递到腔体的功率与机械振荡幅度之间的关系，并且通过了解石英纤维悬浮液的特定对以及机械系统的阻尼系数，可以进行功率测量。该仪器测量的微波功率的误差估计不超过±2％。测量是绝对的，因为校准仅取决于质量，长度和时间的测量。

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