Method for determining a derived property of a medium and nuclear magnetic measuring device, computer program product and computer-readable storage medium for such

A nuclear magnetic flowmeter, comprising:

• a measuring tube having a measuring volume;
• a measuring device designed to carry out nuclear magnetic measurements;
• and
• a computer designed to carry out a method including the following steps:
• carrying out nuclear magnetic measurements on a medium with the first temperature (ϑ1) in the measuring volume;
• determining at least one property of the medium at the first temperature (ϑ1) from the nuclear magnetic measurements, the at least one property being at least one of a first spin-lattice relaxation time constant (T1(ϑ1)) a first spin-spin relaxation time constant (T2(ϑ1)), and a first diffusion time constant (D(ϑ1));
• determining a viscosity (η(ϑ1)) of the medium at the first temperature (ϑ1) from the at least one property;
• and
• determining at least one derived property of the medium at a second temperature (ϑ2) using the at least one property of the medium at the first temperature (ϑ1), the viscosity (η(ϑ1)) of the medium at the first temperature, the first temperature (ϑ1) and the second temperature (ϑ2), the at least one derived property being at least one of a second spin-lattice relaxation time constant (T1(ϑ2)), a second spin-spin relaxation time constant (T2(ϑ2)), and a second diffusion time constant (D(ϑ2)).

A non-transitory computer-readable storage medium including instructions which, when the program is executed by a computer, cause the computer to execute a method including the following steps:

• carrying out nuclear magnetic measurements on a medium with a first temperature (ϑ1) in a measuring volume of a measuring tube;
• determining at least one property of the medium at the first temperature (ϑ1) from the nuclear magnetic measurements, the at least one property being at least one of a first spin-lattice relaxation time constant (T1(ϑ1)), a first spin-spin relaxation time constant (T2(ϑ1)), and a first diffusion time constant (D(ϑ1));
• determining a viscosity (η(ϑ1)) of the medium at the first temperature (ϑ1) from the at least one property;
• and
• determining at least one derived property of the medium at a second temperature (ϑ2) using the at least one property of the medium at the first temperature (ϑ1), the viscosity (η(ϑ1)) of the medium at the first temperature, the first temperature (ϑ1), and the second temperature (ϑ2), the at least one derived property being at least one of a second spin-lattice relaxation time constant (T1(ϑ2)), a second spin-spin relaxation time constant (T2(ϑ2)), and a second diffusion time constant (D(ϑ2)).