Theory of modulation interference laser radar (MILR) method and its computer simulation

Observation of volcanic gases including H₂O is very important for monitoring volcanic activities and volcano energy. The volcanic gases come up from a great depth and they indicate the state of the volcano directly. The laser radar technique is considered to be a useful one for monitoring purposes. The conventional pulse laser radar, however, is not sufficient because of the low signal to noise ratio in the infrared range. The authors propose a new method called Modulation Interference Laser Radar (MILR). Numerical simulation of the reflected wave intensity was performed by the MILR method in order to confirm the effectiveness of the method. As a result, the authors obtained a very sharp reflection at the expected position