Patent ID: 6236458
Filing Date: 2001-05-22
Classification: G01N

Abstract:
An array detector for a particle size distribution measuring apparatus, comprising:a substrate having an elongated rectangular shape; anda plurality of light detecting elements located on the substrate, each light detecting element having a radial width between an upper arc boundary and a lower arc boundary and a pair of radial sides defining a sector angle from a predetermined position to reside on an optical axis whereby, each light detecting element forms a sector that is spaced from an adjacent sector including a first group of detector elements having a plurality of sectors with a common sector angle and at least one other detector element with a smaller sector angle wherein the first group of detector elements are positioned adjacent the predetermined position and the detector element with the smaller section angle is positioned further away from the predetermined position than the first group of detector elements, and wherein each and every upper arc boundary can be bisected by a single radial line extending from the predetermined position on the optical axis.