Measurement Standard devices for precision optics manufacturers, namely, approximately six-inch diameter concentric spherical domes that act as a standard for metrology testing of various testing methods for measuring the surface quality, mechanical attributes and/or the transmitted wave front error of hemispherical/spherical domes

'act':18 'and/or':36 'approxim':9 'attribut':35 'concentr':14 'devic':3 'diamet':13 'dome':16,44 'error':41 'front':40 'hemispherical/spherical':43 'inch':12 'manufactur':7 'measur':1,30 'mechan':34 'method':28 'metrolog':23 'name':8 'optic':6 'precis':5 'qualiti':33 'six':11 'six-inch':10 'spheric':15 'standard':2,21 'surfac':32 'test':24,27 'transmit':38 'various':26 'wave':39

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