Areas of improvement

The early results show that the sensitivity of the IWVM is around 10$\mu$m pwv (1$\sigma$) in 1 second at $\sim$1 mm pwv. This number is about a factor of 10 worse than theory predicts. The main reason for this is our current infrared filter which is far from optimal. Other problems encountered during this first run with the IWVM include:

• we used a general purpose 12-bit data acquisition system (that we have used in other applications for ease of development). It is clear that more resolution is needed
• analysis of Moon scans has shown that the IWVM was slightly out of focus. Because of the fast optics (f/.9) some of the radiation was not reaching the detector