Fujikin Inc.

Hidekazu Ishii

Masaaki Nagase

Nobukazu Ikeda

Kouji Nishino

Takashi Fukawa

Kosuke Sugimoto

Wataru Ashino

Provided is a concentration measurement device that can be miniaturized without using an optical fiber. The concentration measurement device including a measurement cell having a gas flow path and an optical path intersecting the gas flow path; a light source for emitting light inside the optical path, the light sourcebeing installed at one end of the optical path; a first photodetector for detecting a light emitted from the light source as a reference light, the first photodetector being installed at a side of the light source and rearward from a distal end of the light source in a light emitting direction along an optical axis of the light source; a second photodetector for detecting a light emitted from the light source for measuring light absorption, the second photodetector being installed at another end of the optical path.

Density measurement device

A concentration measurement deviceincludes a light sourcefor generating incident light to a measurement spaceA, a photodetectorfor receiving light emitted from the measurement space, and an arithmetic control circuitfor calculating a concentration of a measurement fluid on the basis of an output of the photodetector, and the light source includes a first light-emitting elementfor generating light having a first wavelength, and a second light-emitting elementfor generating light having a second wavelength, and the concentration measurement device is configured so as to calculate the concentration using either light of the first wavelength or the second wavelength on the basis of the pressure or temperature of the measurement fluid.

Concentration measurement device

A concentration measurement method is performed using a concentration measurement device comprising: a measurement cell for flowing a fluid to be measured; a light source for generating light incident on the measurement cell; a photodetector for detecting light emitted from the measurement cell; an arithmetic unit for calculating the absorbance and concentration of the fluid to be measured based on an output of the photodetector; and a temperature sensor for measuring the temperature of the fluid to be measured. The concentration measurement method includes: a step of flowing a gas whose molecular structure varies with the temperature as the fluid to be measured in the measurement cell; a step of making light of a wavelength absorbable by the fluid to be measured to be incident from the light source to the measurement cell; a step of measuring the intensity of light emitted from the measurement cell by the photodetector; and a step of calculating the concentration of the fluid to be measured based on the temperature and the output of the photodetector measured by the temperature sensor.

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Osaka, Japan

Hidekazu Ishii