Study of Fiber-Based Doppler Lidar for Airborne Turbulence Sensor
| Autor: | Takayuki Yanagisawa, Toshiyuki Ando, Yasuisa Ooga, Shumpei Kameyama, Kyosuke Hamazu, Kimio Asaka, Yoshihito Hirano |
|---|---|
| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | The Review of Laser Engineering. 29:371-376 |
| ISSN: | 1349-6603 0387-0200 |
| Popis: | We have proposed and studied a fiber-based Doppler lidar for airborne turbulence sensor. A lidar with small size, high reliability, and high flexibility of arrangement could be achieved by combining fiber-based optics, which are commercially available as optical components utilized in optical fiber communicationsystems, and high repetition rate operation with large number signal integration data processing methods toimprove the SN ratio. In the design assuming the measurement distance of 3km and data renewing rate of 1Hz, required output peak powers with transmitted pulse repetition duty cycle of 5% are as low as 1.5 W, 11 W, and 130 W at the airplane altitude of 1 km, 5 km, and 10 km, respectively. In the ground based primary experiment with the output peak power level of 10W, the wind velocity up to the distance of 2.5 km could be measured with SN ratio of more than 8dB at the data renewing rate of as high as 50Hz. The result well coincideswith predicted theoretical value. To our knowledge, this is the first demonstration of fiber based Doppler lidar for long range wind measurement with a high data renewal rate. By developing fiber amplifiers, which output the pulse peak power of about -kW, and effective signal integration data processing methods, this sensor could become useful for airborne turbulence detection with measurement distance up to 10 km and measurementaltitude of 10km. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|