Tark’s Tech Talk

In this last post about validation, we will talk about ways to validate that we are working on – namely potholing/excavation and our future test and training facility.  The clearest way to move from SUE Level B – geophysical techniques (that’s us) – to SUE...

In the previous “How Do We Know…” post, we talked about how we used surface features, in particular sewer manholes, to validate our results.  In this post, I want to talk about how we use stuff we can’t see to validate ASTlive!’s performance. In this...

Cartacoustics sonic locating equipment can find things other techniques simply can’t at depths other methods cannot reach.  So, how do we know our equipment works? Answering that question will take a couple of posts, and for this post we will focus on things that have...

How do we measure depth with sound?  The basic analogy is shouting from a mountain top and listening for your echo.  We shout into the ground and listen for our echo.  We do more than just listen, because we use a stopwatch to time how...

Why is it that water affects some underground  locating tools differently than others? Water affects these because of its chemical structure.  Water consists of 2 hydrogen atoms stuck to the much larger single oxygen atom (thus H2O).  The hydrogens hang out on the same side of...