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What is the use of fluorescent penetrants?

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What is the use of fluorescent penetrants?

(a) Develop permanent visual records of a remote object

(b) Illuminates and observes internal, closed or inaccessible areas

(c) Enhance the observation of surface cracks

(d) Evaluate surface finish, shape and microstructure

This question was posed to me in class test.

This key question is from Visual Inspection topic in portion Machine Vision Systems of Engineering Metrology

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The correct answer is (c) Enhance the observation of surface cracks

For explanation: Fluorescent penetrants are generally used for visual inspection. It is used to enhance the observation of cracks. Image sensors are also used for visual inspection which develops permanent visual records.

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