The Swoffer Model 3000-12 (shown), quickly profiles shallow streams |
Swoffer Instruments, Inc. |
The Swoffer Fiber-optic sensorsThe basic principle of the Swoffer fiber-optic sensor is simple and unique: Multiple bundles of fiber-optics, assembled into a propeller driven rotor, gate a beam of infrared light from a photo diode to a photo-sensitive transistor producing electronic pulses. These pulses, generated by the propeller rotor over a precisely measured amount of time, are directly proportional to water velocity. The electronic half of the sensor is the latest opto-electronics and is epoxy encapsulated in a �" (12.7mm) diameter acetal resin housing for protection from chemicals and the elements. It can be purchased separately and attached to and used with many in-water devices in addition to those offered by Swoffer. The sensor uses a two-wire signal system requiring only 3 volts for operation and can generate a square wave output signal through over 3000 feet of cable. The rotating portion of the sensor consists of a very low friction fiber-optics rotor rotating around a polished & hardened stainless steel shaft, all driven by a glass-reinforced nylon propeller. All rotor parts are easily replaceable in the field and spares are provided with every new instrument. |
Swoffer Instrumental, LLC 13730 68th Ave W Edmonds, Washington 98026 USA PHONE:(253) 661 8706 CELL: (425) 829-2976 |