YSI SonTek ADVField, Техническая документация инструкция

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SonTek/YSI
4 ADVField Operation Manual (September 1, 2001)
16/10-MHz Probe Configuration with Optional Sensors
: For field applications, the 16/10-MHz
ADV probe can include up to three internal optional sensors (compass/tilt, pressure, temperature)
mounted in a modified signal-processing module (Figure 4). The compass/tilt sensor allows the
ADV to report velocity data in Earth coordinates (East-North-Up or ENU), regardless of instru-
ment orientation. The pressure sensor provides simultaneous pressure and 3D velocity measure-
ments (PUVW for directional wave spectra). The temperature sensor is used for sound speed cor-
rections in long deployments with large temperature fluctuations.
•
The acoustic sensor contains two or three acoustic receivers (for 2D or 3D probes) and one
acoustic transmitter. The sensor can be mounted on a stainless steel stem 25 or 40-cm long.
The acoustic sensor can be oriented looking down, to the side (mounted on a 90° adapter), or
up (with a bent stem and a 90° adapter).
•
The sampling volume is the volume of water ( ≈ 0.3 cm
3
) in which the ADV makes velocity
measurements. Depending on probe configuration, this volume is nominally located either 5
cm or 10 cm (10-MHz systems only) from the acoustic transmitter. Note: The 10-cm probes
are only available in the standard down-looking configuration or on side-looking cables.
•
The 16/10-MHz ADV probe with optional sensors includes the acoustic sensor, the mounting
stem, the end cap, and the signal-conditioning module with optional sensors. The probe serial
number is stamped on the end cap closest to the acoustic transducers. Sacrificial zinc anodes
are attached to the stem and the end cap for corrosion protection. If the processor end of the
high-frequency cable is compatible, 16/10-MHz ADV probes with and without the optional
sensors can be used from the same ADVField processor.
•
The probe X-axis is defined by the direction of the arm of receiver #1, which is painted red.
When looking from the sampling volume towards the acoustic transmitter, the receivers are
numbered 1, 2, and 3 moving clockwise from #1. The probe’s X-axis is also stamped on the
end cap next to the cable connector. (See §5.1 for coordinate system details.)
•
The signal-conditioning module is a Delrin housing with internal receiver electronics and op-
tional sensors. The ADV mounting stem is permanently fixed to the lower end cap and the
high-frequency cable to the processing module is connected to the larger end cap using an un-
derwater mateable connector.
Figure 4 – 10-MHz ADV Probe with Optional Sensors
Probe
Acoustic
Sensor
Sampling
Volume
Zinc
Anode
Stem
Acoustic
Receiver
Acoustic
Transmitter
Signal Conditioning
Module
Underwater Mateable
Connector
High-frequency
Cable to Processor
End Cap
Temperature Sensor
(only in systems with
5-cm sampling distance)
Pressure
Sensor
Underwater Mateable
Connector