Abstract
IT has been shown1 that mechanical forces exerted by an electromagnetic field can be employed to make absolute measurements of microwave power at levels of a few watts or more. Experiments carried out in this department by Mr. I. M. Stephenson have shown that the same method can be used to measure a few tens of milliwatts of power at a wave-length of 3.2 cm. by making use of a vibration-free table and amplifying the resulting small deflexion by means of a photo-cell and galvanometer.
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References
Cullen, A. L., and Stephenson, I. M., I.E.E. Monograph No. 42.
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CULLEN, A. A Microwave Vibration Wattmeter. Nature 170, 1121–1122 (1952). https://doi.org/10.1038/1701121a0
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DOI: https://doi.org/10.1038/1701121a0
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