如果採用 Code V 軟體，那麼可以用 SAGF 函數計算面深(Sag)量： \KzH5 ?
SAGF(surface_num, zoom_pos, x_coord, y_coord) - Sag of the designated surface at x_coord, y_coord S}a]Bt
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如果想知道的是某一非球面的型狀是否能由干涉儀測量，那麼 Code V 提供兩個函數: :t < S
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(1) 使用 Zygo 干涉儀 ALV(fv$cD
函數 @VFA(zoom #, surface #, height) 3H0B+F2XQ
Surface is testable for @VFA < 1.0 no W]E}nN
Surface is not testable for @VFA > 1.0 T:@7E L
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(2)使用 QED 干涉儀 "}wO<O6[
函數 @SSIa(surface #, zoom #, height) .rITzwgB
0 <= @SSIa < 0.5 - surface is readily testable DVVyWn[
0.5 <= @SSIa < 1 - surface is marginally testable U1 HG{u,"y
@SSIa >= 1 - surface is difficult to test
