MiniSVS Sound Velocity Sensors For Marine
The miniSVS Sound Velocity Sensors use state of the art digital “time of flight” technology to provide the lowest noise, highest accuracy, best resolution sound velocity data available.
Small size and a choice of sensor lengths down to just 25mm make the sensor suitable for a variety of applications, and the optional pressure or temperature sensor adds versatility. There is a choice of data formats to allow interface to existing systems. We will also consider OEM and custom designs.
Valeport’s unique digital time of flight technology gives unmatched performance figures, with signal noise an order of magnitude better than any other sensor. The miniSVS is available in a selection of configurations and with optional pressure or temperature sensors. There are a number of size options to suit many applications.
miniSVS – still the most accurate sound velocity sensor in the world. Nothing else comes close.
Sound Velocity Measurement
Each sound velocity measurement is made using a single pulse of sound travelling over a known distance, so is independent of the inherent calculation errors present in all CTDs. Our unique digital signal processing technique virtually eliminates signal noise, and gives almost instantaneous response; the digital measurement is also entirely linear, giving predictable performance under all conditions.
| Physical : | |
| Range : | 1375 – 1900m/s |
| Resolution : | 0.001m/s |
| Accuracy : | Dependent on sensor size |
| 100mm | Random noise (point to point) ±0.002m/s Max systematic calibration error ±0.013m/s Max systematic clock error ±0.002m/s Total max theoretical error ±0.017m/s |
| 50mm | Total max theoretical error ±0.019m/s |
| 25mm | Total max theoretical error ±0.020m/s |
Acoustic Frequency : 2.5MHz
Sample Rate : Selectable, dependent on configuration.
| Rate | SV | SV+P | SV+T |
| Single Sample | ? | ? | ? |
| 1Hz | ? | ? | ? |
| 2Hz | ? | ? | ? |
| 4Hz | ? | ? | ? |
| 8Hz | ? | ? | ? |
| 16Hz | ? | ? | ? |
| 32Hz | ? | ? | ? |
| 60Hz | ? | ? | ? |
Optional Sensors
The miniSVS may be optionally supplied with either a pressure or temperature sensor (but not both). Data is sampled at the rates shown above.
| Sensor | Pressure | Temperature |
| Type | Strain Gauge | PRT |
| Range | 5, 10, 50, 100 or 600 Bar | -5°C to +35°C |
| Resolution | 0.001% range | 0.001°C |
| Accuracy | ±0.05% range | ±0.01°C |
Data Output
The miniSVS has RS232 & RS485 output, selected by command code. RS232 data may be taken directly into a PC over cables up to 200m long, hereas RS485 is suitable for longer cables (up to 1000m) and allows for multiple addressed units on a single cable.
| Baud Rate : | 2400 – 115200 (NB. Low baud rates may limit data rate) |
| Protocol : | 8 data bits, 1 stop bit, No parity, No flow control |
| Electrical : | |
| Voltage : | 8 – 30vDC |
| Power : | 0.25W (SV only), 0.35W (SV + Pressure) |
| Connector : | SubConn MCBH6F (alternatives on request) |
Data Format
Examples of data formats are :
<space>{sound_velocity}<CR><LF>
<space>{pressure}<space>{sound_velocity}<CR><LF>
<space>{temperature}<space>{sound_velocity}<CR><LF>
| SV : | Choose from: mm/s (1510123) m/s to 3 decimal places (1510.123) m/s to 2 decimal places (1510.12) |
| Pressure : | If fitted, pressure is always output in dBar with 5 digits, with a decimal point, including leading zeroes if necessary. Position of the point is dependent on sensor range, e.g. 50dBar 47.123 100dBar 047.12 1000dBar 0047.1 |
| Temperature : | If fitted, temperature is output as a 5 digit number with 3 decimal places and leading zeroes, signed if negative, e.g.
21.456 |
PhysicalPlease refer to factory for detailed dimensions if required. |
|
| Depth Rating : | 6000m (Titanium), 500m (Acetal) |
| Weight : | 1kg (housed type) |
| Housing & Bulkhead : | Titanium or Acetal, as selected |
| Transducer Window : | Polycarbonate |
| Sensor Legs : | Carbon Composite |
| Reflector Plate : | Titanium. |
| Configuration | 100mm | 50mm | 25mm |
| Titanium Housing | 0652004 | 0652005 | 0652006 |
| Acetal Housing | 0652045 | 0652046 | 0652047 |
| Bulkhead OEM | 0652001 | 0652002 | 0652003 |
| Remote OEM | 0652007 | 0652008 | 0652009 |
| Titanium + Pressure | 0652004-P | 0652005-P | 0652006-P |
| Titanium +Temperature | 0652004-T | 0652005-T | 0652006-T |
