For a backlit scene, the light comes from behind the scene so that the object being viewed is shadowed into the MicronEye. Backlighting the object for maximum contrast will give the best repeatable results. Backlighting is recommended when using the MicronEye to measure an object or certain aspects of an object. Backlighting is often ideal for part recognition.
The backlit light source must be large enough so that the MicronEye, without the object in the field of view, will see a uniform amount of light. This is normally accomplished by using several flood lamps and shining the flood lamps onto a diffused surface (ground glass, or diffused white plastic, or frosted mylar), such that a uniform light source is created. Placing the object between the diffused surface and the MicronEye will shadow the object into the MicronEye with maximum contrast. Adjust the f- stop to the maximum value that the amount of light and exposure time will allow.