839 
This detector does not only have a larger detection area than the previous detector, which permits a larger 
part of the collected light to be utilized, it can also be cooled to lower temperatures, which reduces the 
noise considerably. The spectrum to the right was integrated for 100 shots at a distance of 40 m. The laser 
pulse energy was about 30 mJ. In the spectrum to the left a single laser shot was used for the recording. It 
is obvious that even with single-shot detection, the signal-to-noise ratio is very good. 
Some examples of remote sensing are shown in Fig. 6 . Spectra for poplar, cypress and plane-tree 
were recorded at distances of 64 m, 125 m and 210 m, respectively. In Fig. 6 a-c 100 shots are integrated. 
A single-shot recording for cypress is also shown in Fig. 6 d. 
500 550 600 650 700 750 500 550 600 650 700 750 
Fig. 6 . Remote fluorescence spectra for poplar, cypress and plane-tree. 100 shots are averaged in a-c, for 
distances 64 m, 125 m and 210 m, respectively. A single-shot recording at 125 m distance is shown in d. 
Fig. 7. A daily cycle 
recorded on maize. The 
upper diagram shows the 
ratio 1(685)11(480) and the 
lower 1(685)11(735). In each 
point a single-shot and an 
integrated measurement over 
100 shots are shown.