Abstract
Based on the radiation transmission theory, a model of backscattering light and signal light for atmospheric range-gated imaging system has been developed. This model gives time dependent irradiance of backscattering light and signal light on photocathode during the propagation of illuminating pulsed laser in atmosphere. The model could be used to predict and optimize parameters of range-gated imaging systems. Examples with typical system parameters under fog conditions are computed with this model. The results can lead to several conclusions. The first one is that the photocathode irradiance of object image could be higher than that of the background even if optical signal power is lower than optical backscattering power. The second one is that increase in peak power of illumination laser could not improve the image contrast between an object and its background. The last one is that image contrast could be improved by reducing laser pulse width while keeping average laser power unvaried, reducing sensors' field-of-view, or increasing the separation between transmitter and receiver.
| Original language | English |
|---|---|
| Article number | 16 |
| Pages (from-to) | 128-134 |
| Number of pages | 7 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 5633 |
| DOIs | |
| Publication status | Published - 2005 |
| Event | Advanced Materials and Devices for Sensing and Imaging II - Beijing, China Duration: 8 Nov 2004 → 10 Nov 2004 |
Keywords
- Backscattering light
- Laser illuminating
- Range-gated
- Simulating measurement device