FLOW CELL WITH LONG LIGHT PATH LENGTH

摘要

Provided is a flow cell in which the sensitivity is improved while the spread of position distribution of a sample is reduced due to improvement in a flow path structure.The flow cell comprises a first tubular flow path (104) and a second tubular flow path (105), through which light to be measured passes. The first tubular flow path and the second tubular flow path have a shape such that the cross-sectional area perpendicular to an incident light axis is constant or increases continuously in the direction of propagation of incident light, and the cross-sectional area of the first tubular flow path at a light emitting end is equal to or smaller than the cross-sectional area of the second tubular flow path at a light entering end. A sample is introduced into the first tubular flow path through a fluid introducing section (106), and the sample that has passed through the second tubular flow path is discharged from a fluid discharging section (107). Preferably, the flow path cross-sectional area of the fluid discharging section is larger than the flow path cross-sectional area of the fluid introducing section, and a flow cell main body (101) is made of a material that prevents reflection of light in a wavelength range from ultraviolet to infrared.