Temperature measuring device and system and method incorporating the same
View Patent ↗A system having a heat source, a component coupled to the heat source, and at least one thermistor coupled to the component and adapted to monitor temperature of the component, wherein the thermistor has a core-shell microstructure having a shell disposed about a core, the core comprising Cr 2 O 3 and the shell comprising a rare earth element compound.
1. A temperature measuring system, comprising:
a heat source;
a component coupled to the heat source; and
at least one thermistor coupled to the component and adapted to monitor temperature of the component, wherein the thermistor comprises a body formed of a core-shell micro-structure of particles, each particle has a chromia-based core coated with a shell to reduce chromia loss due to chromia volatilization at high temperatures, and the shell comprises a rare earth element compound.
2. The system according to claim 1 , wherein the heat source is an engine.
3. The system according to claim 1 , wherein the component is a catalytic converter.
4. The system according to claim 1 , comprising a measuring device coupled to the thermistor.
5. The system according to claim 1 , comprising a motorized vehicle.
6. The system according to claim 1 , wherein the rare earth element compound is selected from a group consisting of Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, Yb, Ce, and Y.
7. The system according to claim 1 , wherein the shell is substantially stable at a temperature up to about 1000 degrees Celsius.
8. The system according to claim 1 , wherein the rare earth element compound comprises M 2 O 3 , MCrO 3 , M-nitrate, M-carbonate, M-hydroxide, alkooxides, carboxylates, or a mixture of M 2 O 3 and Cr 2 O 3 , wherein M comprises a rare earth element.
9. The system according to claim 8 , wherein the rare earth element compound comprises an aliovalent dopant comprising Ca, Ba, Sr, Mg, Si, or Ti.
10. A thermistor, comprising:
a plurality of electrical contacts; and
a thermistor body coupled to the plurality of electrical contacts, wherein the thermistor body comprises a body formed of a core-shell microstructure of particles, each particle has a chromia-based core coated with a shell to reduce chromia loss due to chromia volatilization at high temperatures, and the shell comprises a rare earth element.
11. The thermistor according to claim 10 , wherein the shell is adapted to stabilize the core up to temperature of about 1000 degrees Celsius.
12. The thermistor according to claim 10 , wherein the shell comprises MCrO3, and M comprises the rare earth element.
13. The thermistor according to claim 12 , where M comprises Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, Yb, Ce, or Y.
14. The thermistor according to claim 10 , wherein the shell comprises M 2 O 3 , and M comprises the rare earth element.
15. The thermistor according to claim 10 , wherein the shell comprises MCrO 3 , and M comprises Y.
16. The thermistor according to claim 10 , wherein the shell comprises at least one compound comprising M 2 O 3 , MCrO 3 , M-nitrate, M-carbonate, M-hydroxide, alkooxides, carboxylates, or a mixture of M 2 O 3 and Cr 2 O 3 , wherein M comprises the rare earth element.
17. The thermistor according to claim 10 , wherein the shell comprises at least one aliovalent doped compound comprising M 2 O 3 , MCrO 3 , M-nitrate, M-carbonate, M-hydroxide, alkooxides, carboxylates, or a mixture of M 2 O 3 and Cr 2 O 3 , wherein M comprises the rare earth element.
18. The thermistor according to claim 10 , wherein the shell comprises at least one aliovalent dopant comprising Ca, Ba, Sr, Mg, Si, or Ti.
19. The thermistor according to claim 10 , wherein the temperature measuring stability of the thermistor ranges up to about 1000 degrees Celsius.
20. The thermistor according to claim 10 , wherein the thermistor has a temperature measuring variability of less than plus or minus 5 degrees Celsius after about 1000 hours at about 1000 degrees Celsius.