Otsuka Pharmaceutical Company, Limited

Otsuka Electronics Co., Ltd.

Yasushi Zasu

Yasuhiro Kubo

Masaaki Mori

Kazunori Tsutsui

Tamotsu Hamao

Katsuhiro Morisawa

Eiji Ikegami

Motonobu Akagi

Takashi Maruyama

Koichi Oka

Masayuki Tani

William Otani

As previous processing of measurement in which gas to be measured containing, as gas components, carbon dioxideCOand carbon dioxideCO, is introduced into a cell, and in which the intensities of transmitted lights having wavelengths suitable for measurement of the respective gas components, are measured and then data-processed to measure the concentrations of the gas components, the air having a predetermined volume Va is sucked by a gas injection device, a gas exhaust valve Vof a cellis closed and the air stored in the gas injection deviceis transferred to the cellfilled with the air at an atmospheric pressure, thereby to pressurize the cell inside. The pressure thus pressurized is measured as P. The cell volume Vc is subtracted from the product obtained by multiplying the sum. Vof the volume Va and Vc the cell volume Vc, by the ratio P/P in which Pis the target pressure of the gas to be measured at which a calibration curve has been prepared for an isotope gas analysis and measurement, thus determining the one-time gas injection amount of the gas injection device. Thus, measured concentration variations based on changes in atmospheric pressure can be corrected.

Gas injection amount determining method in isotope gas analysis, and isotope gas analyzing and measuring method and 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

Light scattering measuring apparatus utilizing a photodetector mounted

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Kyoto, Japan

Yasushi Zasu