Circular dichroism measurement device and circular dichroism measurement method
A circular dichroism and measurement device technology, which is applied in the field of circular dichroism measurement devices, can solve problems such as residue and large gain of lock-in amplifiers
Pending Publication Date: 2021-10-29
JASCO CORP
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0006] According to the definition of the CD value, it should be possible to calculate the CD value based on the ratio of the AC component to the DC component of the detection signal. The ratio of the factor representing the characteristics of the amplifier is not eliminated and remains
One of the main reasons for this is that the gain of the lock-in amplifier is very large
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
no. 1 approach
[0053] use figure 1 The basic configuration of the circular dichroism (CD) measurement device of this embodiment will be described. figure 1 The CD measurement device 100 of the present invention includes a light source lamp 1, a beam splitter 2, a polarization modulation element (PEM) 3, a sample section 4, and a photodetector 5 as a measurement optical unit, and they are arranged in this order on the optical axis of the measurement light. superior.
[0054] The light source lamp 1 is composed of a lamp corresponding to a measurement wavelength range, such as a xenon lamp or a halogen lamp, and emits irradiation light to a sample. The spectroscope 2 is composed of various spectroscopes using prisms and diffraction gratings, and splits the irradiation light from the light source lamp 1 to extract monochromatic light (light with a predetermined bandwidth). The PEM 3 is configured such that an optical element such as synthetic quartz is stressed by a piezoelectric element or...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
This circular dichroism measurement device, which does not require calibration based on a standard sample, comprises a sample part 4 having a sample, a PEM for modulating the polarization of light that is to enter the sample part 4 or emitted light from the sample part 4, a photodetector 5 for detecting variation in the light intensity of the emitted light from the sample part 4, an amplifier 7 for amplifying a detection signal from the photodetector 5, an A / D converter 8 for converting the detection signal amplified by the amplifier 7 into a digital signal, and a digital processing device 10 for acquiring a measurement value for the circular dichroism of the sample by subjecting the digital signal from the A / D converter 8 to signal processing. The A / D converter 8 is configured to convert, into a digital signal, a detection signal that has been amplified in a state in which the detection signal includes an AC component of the light intensity varying at the same frequency as the modulation frequency of the PEM 3 and a DC component.
Description
[0001] Associate application [0002] This application claims priority from Japanese Patent Application No. 2019-048490 filed on March 15, 2019, which is incorporated herein. technical field [0003] The present invention relates to the measurement of circular dichroism (abbreviated as CD). More specifically, it relates to a circular dichroism measurement device capable of measuring the absolute value of circular dichroism without performing a calibration operation using a standard sample. Background technique [0004] The necessity of calibration work using a standard sample in a conventional CD measurement device will be briefly described. Returning to the basics of CD measurement, one of the factors preventing the high sensitivity of CD measurement is that CD is a minute value of about 1 / 100 to 1 / 1000 of absorbance. In conventional CD measurement devices, some degree of sensitivity improvement can be achieved by combining the polarization modulation method and the lock-...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/19
CPCG01N21/19G01J4/04G01N2021/216
Inventor 三好有一近藤吉朗
Owner JASCO CORP