在激光雷达测量平流层下部臭氧时,我们发现光电倍增管接收到较低高度的强信号后,回波信号会产生光子并合现象.数据处理分析表明,光子并合现象对平流层下部臭氧测量的影响很大.为避免产生光子并合现象的产生,可以利用在接收光路上加装中性衰减片、提高光电倍增管开始工作的高度和降低光电倍增管增益等措施来分段测量,提高臭氧测量的精度.

In lidar measurements of ozone in lower stratosphere, the phenomena of photon overlap are found when PMT receives the stronger signals from lower altitude. Data processing and analyses show that photon overlap effect greatly on lower stratospheric ozone measurements. To avoid the phenomena of photon overlap, many measures such as neutral optical attenuator, gate witch and reducing the gain of PMT, are taken to enhance accuracy of ozone measurements