Heatable infrared sensor and infrared thermometer comprising such an infrared sensor
View Patent ↗An infrared sensor with an electrically heatable sensor housing. The housing including a heating device in the form of a strip conductor-like electric heating track, which is controlled by a control device, and applied onto a ceramic substrate. The ceramic substrate comprises an electrically insulated ceramic material providing adequate thermal conductivity and preferably forming the bottom of the sensor housing, and carrying at least one infrared sensor element, e.g., a thermopile sensor. The ceramic substrate having electric strip conductors serving as a contact surface for a corresponding (not-shown) housing cover and through-hole contacts serving as electrical connections between the top side and the bottom side of the ceramic substrate. The electric heating tracks and strip conductors in a preferred embodiment comprise thick-film tracks. The infrared sensor being suitable for a measuring tip of an intra-auricular infrared thermometer.
1. An infrared sensor comprising:
an electrically heatable sensor housing comprising a ceramic substrate and at least one infrared sensor element disposed on the ceramic substrate, wherein
said ceramic substrate includes at least one strip conductor-like electric heating track, which electric heating track substantially encircles the at least one infrared sensor;
the at least one strip conductor-like electric heating track heats said electrically heatable sensor housing by passing electric current through the at least one strip conductor-like electric heating track; and
the ceramic substrate comprises an electrically-insulating ceramic material with a thermal conductivity sufficient to reduce temperature gradients in the electrically heatable sensor housing.
2. The infrared sensor according to claim 1 , wherein the electrically-insulating ceramic material comprises aluminum oxide ceramic, aluminum nitride ceramic or beryllium oxide ceramic.
3. The infrared sensor according to claim 1 , wherein the ceramic substrate forms a bottom of the sensor housing.
4. The infrared sensor according to claim 1 , wherein the at least one strip conductor-like electric heating track comprises a thick-film track.
5. The infrared sensor according to claim 1 , wherein the ceramic substrate comprises electric strip conductors and through-hole contacts.
6. The infrared sensor according to claim 5 , wherein the electric strip conductors are implemented in the form of thick-film strips.
7. The infrared sensor according to claim 1 , further comprising at least one temperature sensor.
8. The infrared sensor according to claim 1 , wherein the at least one infrared sensor element senses temperature.
9. The infrared sensor of claim 1 , further comprising a heating track controller configured to control a heat output of the at least one strip conductor-like electric heating track so as to adjust a temperature of the electrically heatable sensor housing.
10. An intra-auricular infrared thermometer comprising:
an infrared sensor disposed in a measuring tip of the thermometer;
said infrared sensor comprising an electrically heatable sensor housing comprising a ceramic substrate and at least one infrared sensor element disposed on the ceramic substrate and fashioned to sense an intra-auricular temperature, wherein said ceramic substrate includes at least one strip conductor-like electric heating track, which electric heating track substantially encircles the at least one infrared sensor; and
a display on which the sensed temperature is displayed as a measured temperature value,
wherein the at least one strip conductor-like electric heating track heats said electrically heatable sensor housing by passing electric current through the at least one strip conductor-like electric heating track, and
the ceramic substrate comprises an electrically-insulating ceramic material with a thermal conductivity sufficient to reduce temperature gradients in the electrically heatable sensor housing.
11. The infrared thermometer according to claim 10 , further comprising a heating track controller electrically coupled to the at least one strip conductor-like electric heating track and configured to control heat output of the at least one strip conductor-like electric heating track.
12. The infrared thermometer according to claim 11 , further comprising a control device for controlling the determination of the temperature of the infrared sensor based on predetermined parameters of the at least one strip conductor-like electric heating track.
13. The infrared thermometer according to claim 11 , further comprising a control device for controlling the determination of the temperature of the infrared sensor based on predetermined parameters of said infrared sensor.
14. The intra-auricular infrared thermometer of claim 10 , wherein the electrically-insulating ceramic material comprises aluminum oxide ceramic, aluminum nitride ceramic, or beryllium oxide ceramic.
15. The infrared thermometer of claim 11 , wherein the heating track controller controls the heat output of the at least one strip conductor-like electric heating track so as to adjust a temperature of the electrically heatable sensor housing.
16. A method of detecting intra-auricular temperature comprising:
inserting a measuring tip of an infrared thermometer into an auditory canal;
heating a ceramic substrate of a sensor housing of thermometer having an infrared sensor element disposed thereon, the infrared sensor element being fashioned to sense intra-auricular temperature by passing electric current through a strip conductor-like electric heating track disposed on the ceramic substrate, which electric heating track substantially encircles the at least one infrared sensor; and
displaying a temperature sensed by the infrared sensor element,
wherein the ceramic substrate comprises an electrically-insulating ceramic material with a thermal conductivity sufficient to reduce temperature gradients in the sensor housing.
17. The method of claim 16 , wherein the electrically-insulating ceramic material comprises aluminum oxide ceramic, aluminum nitride ceramic, or beryllium oxide ceramic.
18. The method of claim 16 , wherein the ceramic substrate forms a bottom of the sensor housing.
19. The method of claim 16 , wherein said strip conductor-like electric heating track comprises a thick-film track.
20. The method of claim 16 , wherein the ceramic substrate comprises electric strip conductors and through-hole contacts.
21. The method of claim 16 , further comprising controlling a heat output of the strip conductor-like electric heating track so as to adjust a temperature of the sensor housing.