PHASE DIFFERENCE CONTROL DEVICE

Title:

PHASE DIFFERENCE CONTROL DEVICE

Document Type and Number:

WIPO Patent Application WO/2019/163457

Kind Code:

A1

Abstract:

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.

Inventors:

MIYOSHI YUICHI (JP)

Application Number:

PCT/JP2019/003236

Publication Date:

August 29, 2019

Filing Date:

January 30, 2019

Export Citation:

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Assignee:

JASCO CORP (JP)

International Classes:

G01N21/19; G01J4/04; G02B27/28; G02F1/01; G05D25/00

Domestic Patent References:

WO2009139102A1	2009-11-19
WO2015198061A1	2015-12-30
WO2000058699A1	2000-10-05

Foreign References:

JP2004184225A	2004-07-02
JP2007139751A	2007-06-07
JPH0510821A	1993-01-19
JPH0510821A	1993-01-19

Other References: