Cancer that has spread to the lungs may not cause any symptoms or it may cause. 1  A cough that doesn't go away. 2  Shortness of breath. 3  Chest infections. 4  A build up of fluid between the chest wall and the lung called a pleural effusion â this in turn causes shortness of breath, chest aching, discomfort and heaviness.ancer that has spread to the lungs may not cause any symptoms or it may cause. 1  A cough that doesn't go away. 2  Shortness of breath. 3  Chest infections. 4  A build up of fluid between the chest wall and the lung called a pleural effusion â this in turn causes shortness of breath, chest aching, discomfort and heaviness.
A laser is a coherent and focused beam of photons; coherent, in this context, means that it is all one wavelength, unlike ordinary light which showers on us in many wavelengths. The acronym laser stands for light amplification by stimulated emission of radiation.. Lasers work as a result of resonant effects. The output of a laser is a coherent electromagnetic field. In a coherent beam of electromagnetic energy, all the waves have the same frequency and phase.
Laser Radar. A laser radar is a device which uses one of the distance measurement techniques as described above, and scans the direction of the distance measurement in two dimensions. This allows the acquisition of an image, or more precisely a depth profile of some object, as required e.g. in robotics.ome of the most important techniques used for laser distance meters are as follows: 1  Triangulation is a geometric method, useful for distances in the range of ââ1 mm to many kilometers.