Abstract: A fluid medium monitoring apparatus of the present invention comprises: a light source unit for irradiating light; a first collimator unit for collimating light irradiated from the light source unit; a flow cell unit in which a fluid medium flows and light is allowed to absorb the wavelength of the fluid medium while proceeding along the moving direction of the fluid medium; and a light detection unit for detecting the wavelength of the light passing through the flow cell unit.

Abstract: A flow cell device of the present invention comprises a flow path part in which a flow medium flows, and a flow cell part in which a flow path is formed.

Abstract: A fluid medium monitoring apparatus of the present invention comprises: a light source unit for irradiating light; a first collimator unit for collimating light irradiated from the light source unit; a flow cell unit in which a fluid medium flows and light is allowed to absorb the wavelength of the fluid medium while proceeding along the moving direction of the fluid medium; and a light detection unit for detecting the wavelength of the light passing through the flow cell unit.

Abstract: A double tube structure flow cell apparatus according to the present disclosure includes: a first flow path formation part connected to a medium inlet part such that a fluid medium is introduced into the medium inlet part and having a first flow path part such that the fluid medium flows in the first flow path part; a second flow path formation part having a second flow path part in communication with the first flow path part and connected to a medium discharge part such that the fluid medium of the second flow path part is discharged through the medium discharge part; and a bubble discharge part connected to the first flow path formation part to discharge air bubbles mixed with the fluid medium of the first flow path part.