Configuration:

*The first value is the delay set on the pulse generator; the second one is the actual delay.

@Channel-5 result is not reported in this page.

No ND filter

Integration time = 6min for each data

Data processing: dead-time correction, background correction.

Analysis: The data used in this analysis are the same as the ones used in the Gate test#2. Since we think the response of channel-1 is linear, we can directly compare the signals of channel-1 and channel-2 to know the behavior of channel-2 and investigate the gating effect (for channel-2). We are supposed to get a constant ratio since the same telescope, alignment for channel 1 and 2. We have to do dead-time correction and background correction due to the different signal strength and background. The SIB correction is not made here since it is not strong in the Hamamatsu PMT.

We focus on the near-range analog signal, especially 285 signal which is stronger than 291 at near-range. We want to know if the gating improves the linearity of channel-2. For ungated singal in data1, the ratio of 285 ch1/ch2 looks flat from ~500m. For data2 which has a 1.2us delay, this ratio looks good from ~450m. The 291 signal of channel-2 looks good from ~300m due to the weaker UV power. These results suggest that the channel-2 signal is linear from ~500m with ~1.2us gate delay (even without delay) and without any ND. Or we can say at least channel-2 has the same response as channel-2 from ~500m.

Conclusion: 1) We can not retrieve ozone below 500m with channel-2.

2) The signal ratio of ch1/ch2 is about 0.0055, which is lower than we thought. The signal ratios of 285 and 291 have a slight difference.

For more details, please look at PDF files: data1 and data2.