| 摘要 |
PURPOSE:To catch scattered light in its natural state without converging it on one point through an optical system and to shorten an adjustment time by providing a stray light removing member between a flow cell and a light receiver. CONSTITUTION:The focus P of a condenser lens 8 for a light beam (a) is positioned at a particle array in the flow cell 2. Then, a stray light removing member 5 and the light receiver 4 are arranged at a specific angle theta at a specific position from the center of the flow cell 2 to catch the focus P of the particle array 1 in a light passing hole 6, thus adjusting the optical axis. Part of the scattered light (b) generated by irradiating particles in the particle array 1 in the flow cell 2 with the light beam (a) passes through the light passing hole 6 of the stray light removing member 5 and is detected by the light receiver 4. At this time, reflection on the internal surface is prevented and stray light and straight traveling light (c) are removed securely because the internal surface of the light passing hole 6 is a twisted surface. |
