Apparatus for removing reflected light

An apparatus for removing reflected light used for a measuring device that emits a sheet-like beam of light onto suspended particles and measures light scattered from the suspended particles, the apparatus comprising:

• a light introduction unit having a first aperture shaped like a slit through which the light enters, a second aperture facing the first aperture, and a passage through which the light travels from the first aperture to the second aperture;
• a light reflective unit that is disposed opposite to the second aperture allowing the light having traveled through the second aperture to reflect toward a predetermined direction so as to prevent the light from returning into the second aperture;
• a light sealing unit in which the light reflective unit is disposed having an inner wall to confine the light reflected from the light reflective unit;
• and
• a light absorption member provided on the inner wall of the light sealing unit,
• wherein the sheet-like beam of light traverses the suspended particles prior to entering the first aperture, forming a sheet-like measurement space having one edge at an entrance of the first aperture, and
• wherein the measuring device measures the light scattered from the suspended particles in the sheet-like measurement space.