Category Archives: Developing a Flow Sensor

Using the principle of the hydrometric pendulum, I am developing a drag-induced-tilt velocity meter to monitor water flow.

Field Report 2016-03-28: Oldest Generation of Loggers Retired

I know I said I was going to keep the ocean sensors in service till they croaked, but after more than two years of operation I’ve decided to retire the two beta units to our bookshelf museum. B3 & B4 were the last loggers in … Continue reading

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Field Report 2016-03-25: Monitoring in Coastal Mangroves

The unique geology of the Yucatan means that hydrologists like my wife typically study water flowing through the flooded cave systems.  But she also advises some of the many great archaeology projects in the area (The Maya had to get their drinking … Continue reading

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Field Report 2015-12-11: Flow sensors go Farther & Deeper

Baruch Figueroa-Zavala (from CEA) recently installed a new Cave Pearl flow sensor just down the coast from Akumal bay: This marks our deepest ocean sensor deployment to date, and two backup bungees were added to ensure this unit does not get torn from it’s … Continue reading

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How the drag enhancer affected flow meter response

In March we did an experiment by adding small flags to some of our flow sensors to enhance their response in low flow situations. As with so many of the things we have tried on this project, these thin sheets of ABS were the … Continue reading

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Field Report 2015-08-17: Flow Sensors go back into Akumal Bay

With the the dive deployments done, and the Rio Secreto installation out of the way, it was time to start wrapping up the trip.  Sometimes we are forced to leave the open water flow units with Gabriel at C.E.A., but he had … Continue reading

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Field Report 2015-08-07: Retrieve Flow Sensor from Akumal Bay

I was up pretty late downloading the loggers from Rio Secreto the day before, so we had a late breakfast at Turtle Bay Bakery & Cafe the next morning. While the only decent coffee in Akumal has become something of a necessity … Continue reading

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How to calibrate a compass (or accelerometer) for Arduino

When I started building a flow sensor based on the drag/tilt principle, I knew that leaving sensors on their default factory calibration settings was not optimal, but I had so many other things to sort out regarding power use, memory handling, etc., that I … Continue reading

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