Fig. 3
Absolute temperature measurements in solutions and agarose. a Absolute temperature measurements using the pre-calibrated frequency shift thermal coefficient difference \(\Delta \alpha\) and intercept difference \(\Delta {\sigma }_{0}\) from the 1% NaCl solution, as a function of reference temperatures. b Absolute temperature measurements using the self-calibrated \(\Delta \alpha\) and \(\Delta {\sigma }_{0}\) from the 1% NaCl solution, as a function of reference temperatures. The first three experiments were used to self-calibrate \(\Delta \alpha\) and \(\Delta {\sigma }_{0}\) (red dots), then three temperatures were reconstructed from blind experiments at random temperatures with no shim changes (green dots), and the last four experiments included both blind temperatures and shim changes (blue dots), all in the 1% NaCl solution. c Temperature measurements for the 2% agarose sample with 1% NaCl using the \(\Delta \alpha\) and \(\Delta {\sigma }_{0}\) calibration from the 1% NaCl solution, as a function of reference temperatures. d Measured temperatures using 3 frequency measurements to self-calibrate \(\Delta \alpha\) and \(\Delta {\sigma }_{0}\) (red dots) in the agarose sample, and three blind data (blue dots), as a function of reference temperatures. All temperatures are in \({}^{\circ }\)C.
