Estimation of ‘Dead Time’ of Transient Digitizer in Raman Lidar

The Licel transient digitizer used in the Raman Lidar system to record photomultiplier tube (PMT) output can yield the resulting backscattered signal in both analog (in milli volt) and Photon counting (in hertz) modes. The dynamic range of the lidar backscattered signal can be improved by combining the simultaneous measurement of photon counts and voltage analog signal using the slope coefficient [1]. Due to pulse pile-up effect in a photon counter, there is a need for the dead time correction in the photon counts data [2, 3]. The dead time corrected signal is obtained using equation 1.