Guide to Particle Identification
This is part of a guide to the identification of particles seen in samples of transformer oil. It is designed to allow access to files using
any significant feature noticed by the microscopist rather than requiring a specific set of measured parameters. Often the most significant
feature of a particle is unique to that particle type and so is not a useful diagnostic element for a broader Key for particles in general.
This guide will lead to the same particle through a number of different paths depending on features and the order of significance placed on
those features by the microscopist/analyst. When a particle is found that appears to be similar to the one being identified it may be useful
to go to the file of particles of that type. For instance, if it looks like a starch grain then it may be useful to go to the "Starch" file in
this gallery and see a larger variety of starch grains for comparison.
Round or Spherical Particles
Spherical Particles Black with Transmitted Light and Colored with Reflected Light
Spherical Particles Black with Transmitted Light and with Reflected Light
Spherical Particles Transparent with Transmitted Light and Dark between Crossed Polarizing Filters
Spherical Particles Transparent with Transmitted Light and Bright between Crossed Polarizing Filters
(Click here for
more images in this category.)