Vibrating wire technology is used in many sensors, including strain gauges, pressure transducers, piezometers, tilt meters, crack meters and load cells. These sensors benefit a variety of structural, hydrological, and geotechnical applications because of their stability, accuracy, and durability.
The AVW200 vibrating wire interface uses a built-in spectrum analyser to transform from the time-domain (time between pulses) to the frequency domain (pulses per second). There are two advantages in using the frequency domain. Signals can be separated into their relative frequencies and limits can be set on which frequency range is acceptable as a true signal frequency.
The AVW200 can be used through the SDI-12, RS-232, or PakBus network protocol. It has low power consumption (300 µA quiescent and 40mA active) and a rugged design along with the durability and long-term stability of vibrating wire sensors.
Wireless versions are also available, allowing for remote deployment of sensors from the data logger. Programming is easy with data retrieval by a single instruction. The AVW200 also has a on-board radio model option, the AVW206.
When coupled with the AM16/32B, the AVW200 vibrating wire interface can be used by any of the Campbell range of data loggers to measure up 32 single channel sensors, 16 single channel sensors with temperature compensation, or 16 dual channel sensors.
Along with providing noise immunity for vibrating wire sensor measurements, Campbell's AVW200 interface provides advantages that include:
- Increased measurement accuracy and resolution
- The ability to characterise individual vibrating wire sensors
- The ability to monitor and account for long-term sensor drift