Model VT-1 -Sodar System
The Model VT-1 is a monostatic phased-array Doppler sonic detection and ranging (sodar) system. It provides a "virtual tower" for obtaining remote measurements of the wind profile up to a height of approximately 300 m (1000 ft). The system includes a 48-element acoustical array, supporting electronics and laptop computer. The Model VT-1 is entirely self-contained within a portable cabinet and is powered by a 12 VDC power supply or battery, thus making it suitable for use even at the most remote locations. All cabinet components are PVC plastic or stainless steel for durability. Due to its modular design, the entire system can be assembled without tools in a matter of minutes.
- Wind profiles from 15 to 300 m
- High-frequency, low side-lobe antenna
- Minimal siting constraints
- Battery powered - remote site friendly
- Portable - completely self-contained unit
- Sturdy modular cabinet - fast & easy setup
- System control and operation by laptop computer
- Optional inputs for external meteorological sensors
- Unique optional calibration and data processing software
- Competitively priced
The view to the right shows the Model VT-1 antenna enclosure with the electronics module removed, which reveals the reflector board inside. The reflector board is fundamental to the design and operation of the Model VT-1. It is positioned at an angle of 35 degrees from the horizontal which enables the phased array to be positioned 20 degrees from the vertical. Thus, the Model VT-1 phased array points slightly downward, preventing rainfall, snow and debris from collecting inside the antenna elements or on the antenna plane. With this design, ordinary piezo tweeters can be used for the antenna elements. Also, in cold climates, the reflector board rather than the phased array is heated to prevent snow and ice buildup, which would absorb the sodar signal and degrade system performance. As shown in the picture, the inside surfaces of the enclosure are foam lined to absorb side-lobe energy. The reflector board design along with the foam-lined enclosure that surrounds the antenna make the Model VT-1 almost immune to interference from side-lobe echoes. Thus, the Model VT-1 can be used successfully at virtually any location.
