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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: Meas Sci Technol. 2021;32(7):10.1088/1361-6501/abdae3. doi: 10.1088/1361-6501/abdae3

Fig. 20.

Fig. 20

Different types of targets considered by the ASTM E57.02 committee, (a) tetrahedral target, (b) trihedral target, (c) dull grey aluminum sphere, (d) white plastic sphere. All parts reproduced from Muralikrishnan et al [117].