Simple estimate is to pass the light spot diameter is 2 times or more.
简单的估计，是让通光直径是光斑的2倍或以上。
This paper is concerned with the laser ignition performance of energetic material affected by the light spot diameter using photoelectric method.
用光电探测法研究了激光光斑直径对含能材料激光点火特性的影响。
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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