For more information, contact Ed Belcher at (425) 488-1331
GLACIS (pronounced "glasses") monitors underwater tests for NSWC, Crane Division, Glendora Lake Facility. The sonar operator can get different views by changing the sonar's depth, as well as its pan, tilt, and focus. Those functions plus many more are controlled by the operator through a 500-ft fiber optic cable that brings 64 sonar channels of data back to shore at 9 frames/s.
In addition to monitoring tests, underwater salvage or construction, it can be used as a surveillance "camera" in important underwater areas where optical cameras fail due to turbidity.
| 26 cm at 30-m range | ||||
| Resolution: | ||||
| Beamwidth: | 0.5° horizontal by 10° vertical | |||
| Number of beams: | 64 | |||
| Field of View: | 32° | |||
| Image Start Ranges: | 1.6, 9.8, 18.0, 26.4 yd | |||
| Image Window Length: | 52.4, 26.2, 13.1, 6.5 yd | |||
| Down Range Resolutions: | 3.7, 1.84, 0.92, 0.46 in. respective to window length | |||
| Source level: | 209 dB re 1 µPa at 1 m | |||
| Operating Frequency: | 750 kHz | |||
| Power consumption: | 30 watts (sonar only) | |||
| Shore Display: | Windows 95, 98 or NT Application with 10BaseT Ethernet | |||
| Cable: | 500 ft fiber-optic and 120 VAC power | |||
| Weight: | 170 lb (sonar and platform) | |||
| Dimensions: | Underwater unit would fit in cylinder 1.5 m in diameter and 1.4 m high | |||
| Data Storage: | ||||
| Stores sonar frames or "movies" at 9 frames/s. Data are archived on removable disks (Iomega Jazz disks). | ||||
|
|
|
|
|
 |
|
The top left images show a GLACIS display window and a zoomed in section of the display. One can see the acoustic image of a diver 11 yards from the sonar. Also shown in the left image are the diver's acoustic shadow and one rectangular, concrete foot of a bridge. GLACIS was imaging the mud bottom of Lake Union, Seattle, underneath the University Bridge. |
|
|
For more information, contact Ed Belcher at (206) 685-2149 or ed@apl.washington.edu
Applied Physics Laboratory
University of Washington
1013 NE 40th Street
Seattle, WA 98105
| Other Imaging Sonars | Programs & Projects | APL Home |
