Otsuka Electronics Co., Ltd.

Otsuka Pharmaceutical Company, Limited

Katsuhiro Morisawa

Kazunori Tsutsui

Tamotsu Hamao

Yasushi Zasu

Masaaki Mori

Yasuhiro Kubo

Eiji Ikegami

Takashi Maruyama

Koichi Oka

Mitsunao Sekiwa

Takashi Fujimoto

Akira Kawaguchi

Hidehiro Atagi

Motonobu Akagi

Kunio Kumagai

Mayumi Ikegami

Atsushi Toyoshima

An electrophoretic mobility measurement cell includes a container having a rectangular parallelepiped internal space for introducing a sample solution, two electrodes for applying an electric field to the internal space, tubular sample injection and extraction portions in communication with the internal space, first and second caps for covering the sample injection and extraction portions and sealing the internal space, the first cap has a first side surface contacting an inner side surface of the tubular sample injection portion, the inner side surface formed so that the cross-sectional area of the tube increases with distance from the internal space, and the area of the cross section of the first side surface decreases in the direction of insertion of the first cap. The cell and electrode portions are formed integrally, the electrode portions are made disposable together with the cell, and bubbles are unlikely to remain during injection of the sample solution.

Electrophoretic mobility measurement cell and measurement apparatus and method using the same

The present invention provides an electrophoretic mobility measuring apparatus capable of conducting measurement with high sensitivity with optical attenuation reduced by incidence of light through the electrode face. This apparatus comprises a transparent electrodeforming a part of a cell wall of a cellcapable of confining a sample, and the other electrodeopposite to the transparent electrode. A voltage is applied across these electrodes, and light is incident upon the inside of the cellthrough the transparent electrode. The scattering light which scatters from a sample S at a predetermined angle &#x3b8; with respect to the incident angle, is received through the transparent electrode. The Doppler displacement is then measured based on the difference in frequency between the incident light and the outgoing light. The direction of the scattering vector which is the vector difference between incident and outgoing vectors, is substantially identical with that of the normal line h of the transparent electrode face.

Electrophoretic mobility measuring apparatus

A photon correlator comprises a plurality of sampling gateswhich are open during different periods of time; a plurality of memorieseach provided corresponding to each of the plurality of sampling gatesfor storing data corresponding to the number of photons; and a data processing control section for reading out the data stored in the memories, and performing a correlation calculation by means of software. The mechanism of the hardware comprising the sampling gatesand memoriesenables high-speed writing of data in the memories and real-time read out of the data. In addition, the software performs correlation calculations in parallel with the above processing. Accordingly, the particle sizes and diffusion coefficient of particles in a fluid can be obtained at high speed under various conditions.

Photon correlator

A correction curve (FIG.,) is prepared by plotting,CO,concentrations and,CO,/,CO,concentration ratios which are determined on the basis of a calibration curve and,CO,and,CO,absorbances of gaseous samples having the same,CO,/,CO,concentration ratio but known different,CO,concentrations. A gaseous test sample containing,CO,and,CO,as component gases is introduced into a cell, and spectrometrically measured. A,CO,concentration of the gaseous test sample is determined by way of the spectrometric measurement. A concentration ratio correction value is obtained on the basis of the correction curve and the,CO,concentration of the gaseous test sample thus determined. A measured,CO,/,CO,concentration ratio is divided by the concentration ratio correction value thus obtained for correction of the,CO,/,CO,concentration ratio. Thus, the measurement accuracy of the concentration ratios of the component gases can be improved.

Method for spectrometrically measuring isotopic gas and apparatus thereof

Apparatus and breathing bag for spectrometrically measuring isotopic gas

There is disclosed a system in which, according to the time domain method, a laser light is irradiated to an object to be measured, photon pulses based on the scattering light from the object to be measured are received, time series data are generated based on the light receiving signal, and based on the time series data thus generated, the particle size distribution of particles in the object to be measured is measured. Thus, the present invention achieves a considerable reduction in time required for finally obtaining the particle size based on the measured data, as compared with a conventional system using a calculator program.

Particle size measuring system

Growing community of inventors

Kyoto, Japan

Katsuhiro Morisawa