|Wave Probe System :
Wave Probe System
A simple and robust system for the
measurement and recording of water wave profiles, which uses the
principle of measuring the electrical conductivity between two parallel
wires. The system is available in 1, 2 or 3 channel form and can display
data by high speed recorder or input to a data logger. Alternative
lengths of probe are 300mm or 500mm.
- Easily set up and calibrated
- High dynamic accuracy
- Linear calibration over a large range
- Outputs for high speed recorders and data loggers
- Can be operated at different energisation frequencies to avoid mutual interaction between two or more closely spaced probes
- Supplied as a complete working system, with the option of 1, 2, or 3 channels of measurement.
Each probe consists of a pair of
stainless steel wires which dip into the water waves. The electrical
conductivity between them is measured, and is linearly related to their
depth of immersion hence to wave height. The method is free of meniscus
and `wetting´ effects.
The result is a system giving high dynamic accuracy over a wide range of wave heights and frequencies.
Energisation is conducted by means of an
audio frequency drive signal which avoids all polarisation effects at
the wire interface. The signal is balanced relative to earth, to render
the system immune to common mode voltages between the water and
instrument earth. The frequency can be altered to permit two or more
sensors to operate in close proximity without mutual interference.
The probe consists of two 1.5mm diameter
stainless steel wires spaced 12.5mm apart and 300mm long or 500mm long
as required. Each probe is connected to its own wave monitor module in
the electronic console by a twin core flexible cable 10m long. The
distance between the console and probe may be increased up to 100m using
commonly available low current cables.
The power supply module and appropriate
number of wave monitor modules are mounted in a console, finished in
matt textured blue paint and fitted with four rubber feet and carrying