Patent ID: 11879833
Assignee: JASCO CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A circular dichroism measurement device comprising:
a sample part having a sample;
a polarization-modulator that modulates a polarization state of an incoming light to the sample part or an outgoing light from the sample part;
a photo detector that detects a change in a light intensity of the outgoing light from the sample part;
an amplifier that amplifies a detection signal from the photo detector;
an A/D converter that converts the detection signal amplified by the amplifier to a digital signal; and
a digital processor that performs a signal-processing to the digital signal from the A/D converter to acquire a measurement value of circular dichroism of the sample, wherein
the A/D converter is configured to convert the detection signal to the digital signal, the detection signal that is amplified in a state of containing alternating-current component (AC component) and direct-current component (DC component) having the light intensity that changes with the same frequency as a modulation frequency of the polarization-modulator, and
both the AC component and the DC component are amplified by a same amplifier and are both provided to the A/D converter.