Because this method does not require the measurement light spot diameter, it avoids the problem that the light spot diameter is difficult to be accurately measured.

由于本方法不需要测量光斑的直径，避开了光斑直径不易测量准确的难题。

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Because this method does not require the measurement light spot diameter, it avoids the problem that the light spot diameter is difficult to be accurately measured.

由于本方法不需要测量光斑的直径，避开了光斑直径不易测量准确的难题。

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