ABSTRACT
This chapter focuses on the use of the proton chemical shift and discusses the temperature imaging method by temperature-dependent parameter. Thermometry using proton magnetic resonance of solution samples in glass capillaries or solid samples at very low temperatures has been researched since long before, and some methods have been put to practical uses. In general, a proton is surrounded by an electron cloud, other atoms, or molecules. The electrical current generated by the electron cloud in the external field creates a local magnetic field with a direction opposite to the external field. The shielding constant for the proton in a radical with hydrogen bonding is dominated by the hydrogen bonding strength. The transitional changes must be taken into account to inspect the results on the temperature dependence of the water proton chemical shift. Generally, the accuracy of the parameter estimation by least mean square method depends on the signal to noise ratio and the number of data points.
