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Airborne digital holographic system for cloud particle measurements
Jacob P Fugal1, Raymond A Shaw, Ewe Wei Saw
1Department of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA.
Applied Optics
|December 14, 2004
Summary
A new Holographic Detector for Clouds (HOLODEC) system provides clear, in situ 3D images of atmospheric cloud particles. This advanced instrument is suitable for deployment on research aircraft in harsh conditions.
Area of Science:
- Atmospheric Science
- Cloud Physics
- Instrumentation
Background:
- Understanding cloud particle properties is crucial for climate modeling and weather forecasting.
- In situ measurements of cloud particles require robust instrumentation capable of operating in extreme environmental conditions.
Purpose of the Study:
- To develop and test an in-line holographic system for in situ detection of atmospheric cloud particles.
- To assess the system's performance under typical research aircraft operational conditions, including speed, temperature, and humidity.
Main Methods:
- Development of the Holographic Detector for Clouds (HOLODEC) system.
- Integration of the digital HOLODEC instrument with an aircraft's control and data-acquisition system via optical fiber.
- Field deployment and testing aboard the National Center for Atmospheric Research C-130 research aircraft.
Main Results:
- The HOLODEC system successfully obtained clear holograms of cloud particles during daylight flights.
- The instrument demonstrated operability at temperatures below -30°C and typical cloud humidities.
- Preliminary data confirmed the system's capability to capture 3D spatial distributions and ice crystal shapes.
Conclusions:
- The HOLODEC system is a viable tool for in situ cloud particle detection.
- The technology shows significant utility for advancing research on cloud microphysics and atmospheric processes.