Jasco Corporation

Yoshiro Kondo

Hisashi Masago

Koshi Nagamori

Masayuki Watanabe

Satoko Suzuki

Akio Wada

Tomoyuki Fukazawa

Katsuji Hasegawa

Takahiko Takenouchi

Yasuo Horiguchi

Taiji Oyama

Based on an HT voltage value of each data point applied to a light detector and a plurality of reference spectra measured, in measurement of a reference substance performed for a plurality of times, a weighting function deriver of a spectrum measuring device derives a relation between the HT voltage value (HTi) and a degree of dispersion σi of a plurality of spectral values as a weighting function (σ=f(HT)). Moreover, a numerical evaluator of the spectrum measuring device is configured to calculate a degree of individual coincidence between a sample spectrum and the reference spectrum, acquire the degree of dispersion σi by applying the HT voltage value at measuring the sample spectrum to the weighting function as a weighting value, and evaluate the difference between the reference spectrum and the sample spectrum based on the degree of individual coincidence to which the weighting value is applied.

Spectrum measuring device suitable for evaluating difference between spectra

A circular dichroism measurement device includes: a sample part having a sample; a PEM 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 processing device that executes a signal processing to the digital signal from the A/D converter to acquire a measurement value of circular dichroism of the sample. The A/D converter is configured to convert the detection signal, that is amplified in a state of containing the AC component and the DC component of the light intensity that changes with the same frequency as the modulation frequency of PEM.

Circular dichroism measurement device and circular dichroism measurement method

The present invention relates to improvement in accuracy in a device and a method for determining whether a spectrum of a target sample coincide with a standard spectrum or not. A spectrum determination devicedetermines whether a sample spectrum coincides with a reference spectrum or not by the reference spectrum obtained from a spectrum group. The spectrum determination devicecomprises a storage unitfor storing the reference spectrum, and a determination unitfor comparing the reference spectrum and the sample spectrum to determine a samplefrom the comparison result. The reference spectrum is set with a differing weighting for each point. The determination unitcalculates an individual coincidence with the sample spectrum for each point of the reference spectrum, and calculates a coincidence of the sample spectrum with the reference spectrum by the individual coincidence and the differing weighting to determine the sample

Device and method for spectrum determination

A polarizing monochromator comprising a uniaxial birefringent crystal prism, the prism has the geometry of a triangular block having a triangular base, a face including a side of the hypotenuse is an input-output face, where light enters and exits, and a face including the longer side of the right angle is a reflection face, the optic axis of the prism is perpendicular to the base of the prism, the angle of the input-output face of the prism with respect to light coming from a collimator optical system is determined in such a manner that ordinary light and extraordinary light exit from the input-output face of the prism in opposite directions with respect to an optical axis connecting the collimator optical system and the prism, and a light-collecting optical system is disposed to collect either extraordinary light or ordinary light exiting from the input-output face of the prism.

Polarizing monochromator

Growing community of inventors

Tokyo, Japan

Yoshiro Kondo