Error correction unit and object temperature detection device
Disclosed is an error correction unit enabling constant accurate measurement of a moving object by correcting an error attributable to a change in sensitivity of a thermal image sensor, a change in distance between a thermal image sensor and an object, or an ambient environment. Further disclosed is an object temperature detection device equipped with the same. The error correction unit includes a first arm member rotatably coupled to a thermal imaging camera unit, a heating element holder rotatably coupled to the first arm member, the heating element fixed to the heating element holder, and a temperature sensor configured to measure a temperature of the heating element. The heating element is positioned within an angle of view of the thermal imaging camera unit through rotational motion of the first arm member and the heating element holder. The temperature sensor measures the temperature of the heating element at a first time and a second time different from the first time so that the controller can use a temperature change value of the heating element. Data of the temperatures of the heating element, which are measured respectively at the first time and the second time, are transmitted to the controller.
1. An object temperature detection device comprising:
a thermal imaging camera unit with a thermal image sensor;
a heating element being moved together with the thermal imaging camera unit and being disposed within an angle of view of the thermal imaging camera unit,
a temperature sensor measuring a temperature of the heating element,
a controller calculating a temperature of a target object using a thermal image information of the heating element obtained by the thermal image sensor and a temperature change value of the heating element; and
a heating controller that controls a voltage applied to the heating element so that the heating element constantly maintains a temperature by generating heat,
wherein the temperature change value is a value obtained from the temperature value measured at a first time and the temperature value measured at a second time of the heating element,
wherein the first time is a time at which a first thermal image of the heating element is obtained before a thermal image of the target object is obtained, and the second time is a time at which a second thermal image of the heating element is obtained after a predetermined time has elapsed from the first time.
2. The object temperature detection device according to claim 1 , further comprising an at least one arm member for positioning the heating element so as to be placed within an angle of view of the thermal imaging camera unit regardless of the movement of the thermal imaging camera unit.
3. The object temperature detection device according to claim 2 , further comprising a support mounted on the thermal imaging camera unit,
wherein the at least one arm member includes a first arm member and the first arm member is connected to the thermal imaging camera unit via the support, and
the first arm member is rotatably connected to the support.
4. The object temperature detection device according to claim 2 , wherein the heating element is configured to be arranged perpendicularly to a thermal imaging central axis D1 of the thermal imaging camera unit through adjustment of the at least one arm member,
wherein when perpendicularly arranged, a virtual line extending from a surface of the heating element is orthogonal to the thermal imaging central axis D1.
5. The object temperature detection device according to claim 4 , wherein when the thermal image sensor obtains a thermal image of the heating element, the heating element is arranged in perpendicular to the thermal imaging central axis D1.
6. The object temperature detection device according to claim 1 , wherein the heating element is configured to be disposed in an upper region within an angle of view, and
the upper region within the angle of view is an area above the thermal imaging central axis D1 of the thermal imaging camera unit.
7. The object temperature detection device according to claim 2 , further comprising a support mounted on the thermal imaging camera unit and a heating element holder connected to the at least one arm member;
wherein the at least one arm member includes a first arm member and a second arm member and the second arm member disposes between the first arm member and the heating element holder,
wherein the second arm member is rotatably coupled to the first arm member via a first joint and the heating element holder is rotatably coupled to the second arm member via a second joint.
8. The object temperature detection device according to claim 1 , wherein the heating element comprises a PTC (Positive Temperature Coefficient) device or a LED device.
9. The object temperature detection device according to claim 3 , wherein the first arm member is rotatably coupled to the support via a hinge joint or a ball joint.
10. The object temperature detection device according to claim 7 , wherein the first joint or the second joint is a hinge joint or a ball joint.