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reference block

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reference block [′ref·rəns ‚bläk]
(computer science)
A block within a computer program governing a numerically controlled machine which has enough data to allow resumption of the program following an interruption.


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If light is changed, or other factors, the reference block selecting is inaccurate in motion estimation, resulting in the coding block is mistakenly believed as campaign block, so the error division is produced.
It is being used to measure surface residual stresses that distort parts being machined from thick plates, to characterize ultrasonic reference blocks used to calibrate ultrasonic inspection systems, and to monitor the condition of surface layers used to extend fatigue life or improve wear resistance.
This reference block was chosen since it provides a pulse path from transducer to defect that is similar to that used in hanger pin specimens.
 
 
 
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