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7 Cards in this Set
- Front
- Back
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How is radiographic sensitivity determined?
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with the use of IQIs. Put the IQi on the specimen and perform the radiographic procedure. The IQI will have left an image and the sensitivity can be determined
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What is microfocus radiography used for?
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- The beam of electrons is focused to a point on the target material.
- This eliminates the geometric unsharpness and means the image can be enlarged by moving the object closer to the source and increasing the intensity or exposure time. |
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What are the disadvantages of EMATs?
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- not as efficient as piezoelectronic transducers
- not as sensitive as piezoelectronic transducers |
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What precaution is necessary for eddy current inspection?
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The specimen needs to be saturated first. This is done by placing it in a large magnetic field so that the magnetic permeability doesn't change.
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What are the advantages and disadvantages of the EC method?
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+ non-contact
+ the probe can be very small to access complex geometries + highly sensitive to surface breaking cracks - a direct site is not determined - sensitive to electrical properties of material |
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How is the centre frequency of a compressional transducer determined?
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The crystal thickness determines the centre frequency by λ=2*thickness
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What is the inverse distance law?
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I1/I2 = (L2/L1)^2
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