Category Archives: News

SediMeter™ Courses

In 2018 the SediMeter™ SM4 model started being used in production monitoring projects. Among the experiences learned was the need for knowledge transfer in order to get the projects on track quickly and efficiently. The SediMeter™ system for sediment spill monitoring is advanced and capable, but this also means that operators need to be trained properly.

SediMeter™ SM4 instruments for use in the course

Lindorm Inc is therefore offering an introductory course over two days on a beach resort, where the attendees will carry out all parts of a practice deployment, including actually collecting data from a deployment over night.

Course invitation from Lindorm’s YouTube channel

The SediMeter™ SM4 an Immediate Success

The fourth SediMeter™, released in 2018, has become an immediate success for sedimentation monitoring. In two projects, on both sides of “The Pond,” SediMeters are now used to monitor sedimentation on sensitive bottoms in real time (article in IDR).  The decisive feature in SM4 is that it includes a turbidimeter, apart from the SediMeter sensor itself. This means that for dredging spill monitoring, it handles both the key tasks required: It monitors near-bed turbidity, and it monitors sedimentation on the bottom.

Among the most interesting results so far is the realisation that near bed turbidity and sedimentation are not nearly as closely correlated as one might expect. There can be high near bed turbidity without sediment accumulation, and vice versa, says Dr. Ulf Erlingsson, who has helped the client in interpreting the first results.

New SediMeter version from Lindorm

The year 2017 promises to be the most interesting year ever for the SediMeter, with many new features and even new models in the works. Lindorm has today announced a model with a built-in vibrator that shakes off particles and bubbles that are loosely attached to the sensor. Such particles offset the zero on the turbidity measurements, so getting rid of them is important for accuracy. They have had a model with a mechanical cleaner, but it is pricey, and anything mechanical in a liquid full of suspended sand is an invitation for problem. So the new vibrator model, costing no more than the base model of 2016, might be of great interest for many applications.

The new SediMeter model, SM3C, looks the same as the base model SM3A except that it is 3 cm longer to fit the vibrator.
The new SediMeter model, SM3C, looks the same as the base model SM3A except that it is 3 cm longer to fit the vibrator.

Another novelty is that it measures not just straight backscatter but also oblique backscatter, thus effectively doubling the vertical resolution of the turbidity profile.

Every second line of data represents straight backscatter (sent and received from the same detector), and the other lines represent oblique backscatter, which is the average of light sent from N-0.5 and received at N+0.5, and sent from N+0.5 and received at N-0.5.
Every second line of data represents straight backscatter (sent and received from the same detector), and the other lines represent oblique backscatter, which is the average of light sent from the one above and received at the one below, and vice versa.

This double resolution will be offered in all SediMeter versions from 2017 according to underhand information.