1. A Faraday Cup is used for measuring the beam current at the specimen plane. The beam of electrons is focused inside the hole by increasing magnification so that when the hole fills the screen all the electrons are trapped and a true measure of current is achieved. The hole size of the Faraday Cup is 150µm
2. The Silicon Test Specimen is made of single crystal silicon of overall dimension 5mm x 5mm. It is marked with clearly visible squares of periodicity 10µm. The dividing lines are about 1.9µm in width and are formed by electron beam lithography. A broader marking line is written every 500µm, which is a very useful additional feature for light microscopy.
3. The Duplex Brass standard allows for checking the resolution and performance of the Backscattered Electron Detector. The resolution of a detector is usually quoted as 0.1 (Z) where the atomic number (Z)=30. This is obtained in our standard by the mean atomic number between phases of α/β Brass, being 0.1Z
4. Resolution standards are used for testing the resolved gaps and the number of grey levels in an image. This is to ensure that the resolution has not been distorted by using contrast to maximise the visibility of edges. These are available as either gold crystals or tin spheres on a carbon substrate. Gold on carbon is available in different particle size ranges, enabling it to cover the full resolution range.
5. The BSD reference standards are used for checking the contrast efficiency of Backscattered Detectors. Each of the reference specimens consists of two high purity elements that have an atomic number difference of 1.
6. Standard hole, allows for the insertion of a block of standards 25mm or 32mm diameter x 5mm thick brass block which allows calibration and test standards to be kept together
All of the items listed 1 – 5 can be included in any custom built block
EMS For more information please visit –
www.emsdiasum.com
January 2013
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