Temperature compensating optical debris analysis fixture

摘要

An optical debris analysis fixture for obtaining a precise focus point for imaging debris passing through an optical flow cell, includes a support rod assembly having a mounting block at one end and a camera block at an opposite end. A flow cell block slidably carried by the support rod assembly and a fixed rod is secured at one end to the mounting block and at an opposite end to the flow cell block. The support assembly includes a pair of parallel, spaced apart rods of substantially equal length. The parallel rods are made of a different material than the center rod so that any change in temperature causes the optical flow cell block to move no more than 50 microns with respect to the camera block.