The mq-ProFiler is essentially immune to sample-induced effects on the tuning and matching conditions for the RF probe (a well-known problem in NMR). Frequent probe tuning is a routine operation for trained researchers in laboratory conditions. However, such manipulations are undesirable and troublesome when the analysis is carried out in production or in an uncomfortable environment with limited access time. This is actually the case for on-line quality control (QC) applications as well as for the in-situ measurements carried out during the Eureka E!2214 Project.
Fortunately, the special design of the resonant circuit in the mq-ProFiler RF probe makes it insensitive to the sample`s dielectric properties (Fig. 1), so that tuning and matching do not require readjustment after loading of the probe with the sample. Additionally, an insensitivity to the electromagnetic environment is achieved. Figure 1 shows the tuning curve for the mq-ProFiler before (top) and after (bottom) loading of the RF probe with a sample. No significant effects due to sample dielectricity are observed.