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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/163457
Kind Code:
The present invention relates to a technique for improving a response characteristic of a phase difference control device that can be used in a circular dichroism (CD) dispersion meter. The phase difference control device is provided with a splitting polarizer 14 which splits light from a light source 12 into linearly polarized measuring light and linearly polarized reference light, a photoelastic modulator (PEM) 16 which imparts a phase difference to the measuring light and the reference light to correspond to spectral measurement, a PEM driver 18 which supplies a modulation voltage to the PEM 16, a PEM control circuit 24 into which the reference light is input as a feedback signal, and which outputs a modulation control quantity signal to the PEM driver 18, and a CPU circuit 26 which monitors the wavelength of light from the splitting polarizer 14 and into which a change in wavelength is input as a wavelength signal, wherein the CPU circuit 26 converts the wavelength signal into a feed-forward signal, and the feed-forward signal is input into the PEM control circuit 24, and the PEM control circuit 24 performs arithmetic processing using the feedback signal and the feed-forward signal, and outputs the modulation control quantity signal to the PEM driver 18.

MIYOSHI, Yuichi (2967-5 Ishikawa-machi Hachioji-sh, Tokyo 37, 〒1928537, JP)
Application Number:
Publication Date:
August 29, 2019
Filing Date:
January 30, 2019
Export Citation:
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JASCO CORPORATION (2967-5 Ishikawa-machi, Hachioji-shi Tokyo, 37, 〒1928537, JP)
International Classes:
G01J4/04; G01N21/19; G02B27/28; G02F1/01; G05D25/00
Attorney, Agent or Firm:
IWAHASHI, Yuji (2-5-15, Shin-yokohama Kohoku-ku, Yokohama-sh, Kanagawa 33, 〒2220033, JP)
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