2-minute Introduction to Lowell Instruments
TCM-1 Current Meter Overview
This video is a quick look at the new TCM-1 current meter from Lowell Instruments. In this example the TCM-1 is deployed in a tidal stream at the outlet of a salt marsh. The depth is about 1 meter, the tide is fairly low, but continues to fall, and the current is about 50 centimeters per second or 1 knot. The meter is anchored to the bottom by a short flexible tether and a 5 kilogram lead weight. The TCM-1 measures current via the drag-tilt principle. The meter records its orientation using a three-axis accelerometer and three-axis magnetometer up to 64 times per second. The orientation data is stored internally on a SD card. The data is filtered and post processed to determine current speed and bearing. The meter has sufficient battery and memory to record current velocity for months to years depending on recording rates.