Sensors


#1

Hello ,

I am completely new to this and green around the gills.I am currently building an ROV pod and any advice would be appreciated.At the moment I am specking sensors for depth (pressure) and water flow (speed). Depth, Using absolute pressure sensors maybe even three sensors as to gain a reliable result. Ideally one with a foul free surface not open to the harsh marine environment. Speed, I have looked at a few different solutions including a dual absolute pressure sensor to give a pitot reading. Also an LDV sensor http://measurementsci.com/products_microV.html May be an impeller with hall sensors but as I have spent a few years building and repairing these I would like to try something else. I am testing an Electromagnetic Current Meter but the size and flow disturbance is to much for an ROV, the LDV may be a better option. Also data logging to create a "black box" for the unit and be able to analyse the data if needed. This would also include a "pinger" for recovery if sudden parameters are reached ie depth ,comms loss,etc Which sensors are you using at the moment any advise would be appreciated, Pat

#2

Pinger for recovery could be overkill due to the big yellow wire sticking out the back of the ROV.

The micro velocity probe is very interesting. Thats a pretty clever device.

As for depth/pressure sensor, i think OPENROV uses one as an optional addon imu/pressure sensor. If i was going to build one I would start with their selection and determine if improvements are necessary, then go from there.


#3

The pinger I had in mind is made by Vemco the V9P due to its size. JW fisheries also make units but for this scale I think the Vemco units are more practical. The pinger could be triggered manually and or from a leak sensor etc.

http://vemco.com/wp-content/uploads/2013/12/v9_cont.pdf

The MicroV sensor is very interesting and I wondered if anybody had any experience with these?

I shall look into the OpenROV pressure sensor.

Thanks for the advise Im very impressed with this site and its Open way of pooling ideas and experience together.