Campbell Scientific is excited to announce the release of the CDM-VW300 and CDM-VW305, our new dynamic vibrating-wire analyzers. The new analyzers promise to broaden the potential market of vibrating wire sensors, which allows us to serve our customers better. Vibrating-wire technology is used in many sensors, including strain gages, pressure transducers, piezometers, tiltmeters, crack meters, and load cells. These sensors benefit a wide variety of structural, hydrological, and geotechnical applications because of their stability, accuracy, and durability.

Traditionally, vibrating-wire sensors were limited to static measurements. Sensors such as bonded-foil strain gages were used for dynamic measurements, but they did not match the long-term performance found in vibrating-wire sensors. Often, structures equipped with vibrating-wire sensors also used other sensors to make the dynamic measurements. Campbell Scientific’s CDM-VW300 and CDM-VW305 dynamic vibrating-wire analyzers change all of that. These new analyzers can measure standard single-coil vibrating-wire sensors at rates of 20 to 333 Hz, allowing them to be used for dynamic measurements. Now that vibrating-wire sensors can make both static and dynamic measurements, structures that at one time included two sets of instruments can use a single set of instruments. This reduces the expense of the equipment and the installation, while providing higher quality data.

Dynamic Vibrating Wire Introduction - 4:48

Besides adding dynamic measurement capabilities, the new analyzers use the innovative spectral interpolation method that was originally developed for our AVW200-series analyzers. This method features superior noise immunity and measurement resolution compared to the time-domain period-averaging approach. The spectral interpolation method also provides diagnostic information about the measurement.

The CDM-VW300-series analyzers allow one datalogger to monitor many vibrating-wire sensors. Each CDM-VW300 can simultaneously measure two vibrating-wire sensors, and each CDM-VW305 can simultaneously measure eight sensors. The analyzers connect to the datalogger via the SC-CPI Datalogger-to-CPI Interface, and multiple analyzers can be connected to and controlled by a single SC-CPI and datalogger combination. Measurements on all of the channels across all of the analyzers are synchronized to each other and to the datalogger.

Vibrating-wire sensors are an important long-term monitoring tool in the structural, transportation, and geotechnical applications. With the dynamic vibrating-wire capability, those same trusted sensors can be used to collect both static and dynamic data with the same high precision and long-term stability that was previously limited to static measurements. While saving costs, the CDM-VW300 series opens up new possibilities for future measurements.

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