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Which type of pathways is used for laser interferometer present in three dimensional measuring machines?

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Which type of pathways is used for laser interferometer present in three dimensional measuring machines?

(a) Helium unshielded pathways

(b) Neon unshielded pathways

(c) Helium shielded pathways

(d) Neon shielded pathways

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The doubt is from Three Dimensional Measuring Machine topic in portion Measuring Machines & Total Quality Management of Engineering Metrology

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Correct option is (c) Helium shielded pathways

Explanation: Displacement accuracy is achieved by laser interferometers. Laser interferometers are operated in helium-shielded pathways. The interferometers are located in strict accordance with the Abbe principle.

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