GEO-MRI | NMR Borehole Logging Sondes: Calibration is (almost) everything!

I was often called a "calibration fanatic" for our physical property instruments on the JOIDES Resolution. However, at the end of an expedition, one could see the difference quite clearly, whether one has paid attention to this "point zero" work step from the beginning / continuously during a voyage, or not. Easy to understand, right?...

I was all the more pleased to observe how meticulously the Vista-Clara Inc. team handles this important step responsibly.

A whole arsenal of borehole measurement probes is offered, with diameters ranging from 1.75 to 5.5 inches. Before each deployment, a desired measuring probe is checked in a suitable water tank for its signal quality and noise value, and calibrated if necessary. Only then, after the respective calibration, the measuring probe is shipped to the customer | its respective field application.

Vista-Clara Inc. borehole logging probes feature diameters from 1.75 inches to 5.5 inches. The technical details are well described on their website. Better yet, contact the company directly and clarify any application-specific questions.

What also impresses me, however, is the fact that from the very beginning and already during the assembly of the measuring probes, care is taken to ensure that all work steps are carried out as consistently as possible and with consistently high quality for each instrument. As was explained to me during a calibration of a DART system (1.75 inch diameter), at the end of the calibration you can also see from the signal/noise values (SNR) how well work was done during the production phase. Not without pride, it is then announced, "Noise Level 3-4%!" -- and if it's not that good, more tinkering is done. (Of course, the above also applies to all surface measurement instruments...)