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The MIDAS DWR brings a range of unique features, as well as the standard non-directional data available from the MIDAS WTR, the MIDAS DWR performs full onboard directional data analysis, allowing real-time directional information at an unsurpassed 2° resolution.
The MIDAS DWR is fitted with a choice of strain gauge or high accuracy piezo-resistive pressure sensors, and a fast response PRT temperature sensor as standard. Note that whilst the piezo-resistive sensor offers a higher absolute accuracy, the quality of wave data owes more to deployment location and sampling pattern than to sensor performance. Optional additional sensors include Conductivity and Turbidity.
In order to correctly measure wave activity, Linear Wave Theory requires a specific number of data points to be sampled over a period of time. These data points are then processed on board the instrument to generate an accurate summary of the wave activity during the measured period. The MIDAS DWR therefore operates in a strict pattern of “sample, process, sleep”, with the user controlling the number of samples and the sampling rate, together with the duration of the sleep period. This may be minimised for almost continuous sampling, but obviously at the expense of battery and memory usage.
The MIDAS DWR is fitted with 64Mb solid state non-volatile FLASH memory. Total capacity depends on setup. User may save any or all of the following: · Raw sensor data from each burst · Summary statistics of wave burst · Tide & additional sensor data · Spectral analysis of wave burst. If all data is saved, memory will typically record over 4000 data bursts. Sampling once every 2 hours, this is over 2 months data.
System is supplied with WaveLog Express PC software, for instrument setup, data extraction and display. WaveLog Express is licence free.
The instrument will operate autonomously, with setup and data extraction performed by direct communications with PC before and after deployment. It also operates in real time, with a choice of communication protocols for a variety of cable lengths, all fitted as standard and selected by pin choice on the output connector:
The Tidemaster is the cost-effective way to accurately record water height, with the added option of gathering meteorological data using its ultrasonic wind speed and direction sensor.
Valeport’s industry-leading TideMaster Tide Gauge is as the core of Tidestation, bringing Pressure, Radar and hybrid tidal observation techniques coupled with interfaces to other meteorological and 3rd party systems.