Provided metal can be excluded and the product
held stationary for the several seconds required to make
a measurement, NMR can (in principle) be used as an
on-line solid fat content sensor. By analogy, it should be
possible to build an on-line freezer sensor based on
NMR and indeed such a device has been brought to
practice (McCarthy & Reid, 1997). Ultrasound has also
been used for solid fat content determination and may
be appropriate for the study of water freezing.