Patent ID: 9664618
Date: 2017-05-30
CPC Classifications: G01N

Claim:
1. A particle detector, comprising: a flow cell that is transparent and includes a through hole having a circular sectional shape, the through hole being configured to allow a fluid containing a particle to flow therethrough; an inspection light source configured to irradiate the flow cell with inspection light in a direction perpendicular to an extending direction of the through hole, stray light being generated due to reflection and refraction of the inspection light; and an optical detector configured to detect reaction light generated by the particle irradiated with the inspection light in the flow cell, wherein the flow cell includes a semispherical reflective film that is configured to reflect the reaction light generated by the particle irradiated with the inspection light, the semispherical reflective film has a cut at a portion thereof where the semispherical reflective film intersects a sector-shaped plane such that the semispherical reflective film does not reflect a portion of the stray light exiting the flow cell in the sector-shaped plane and that the optical detector does not detect the portion of the stray light exiting the flow cell in the sector-shaped plane, and the sector-shaped plane has a vertex at an intersection point of the inspection light and the through hole of the flow cell, is parallel to an optical path of the inspection light, and is perpendicular to the extending direction of the through hole of the flow cell.