POWER MEASUREMENT METHOD AND DEVICE USING FARADAY CELL AND POCKELS CELL

摘要

PROBLEM TO BE SOLVED: To make realizable a real-time power measurement at a high speed and in a highly insulated state.

SOLUTION: The power measurement device is provided with a Faraday cell 1 to which current (magnetic field) is supplied; a Pockels cell 2 to which voltage (electric field) is applied; a quarter-wavelength plate 3; a light beam splitter 6 which splits a modulated light from this quarter-wavelength plate 3 into two light beams; photodiodes 71, 72 which convert the respective light beams into electric signal; and amplifiers 81, 82. Using the output differential between both the amplifiers 81, 82, the device can all-optically measure the power in real time and at a high speed.

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