Thermal sensor, thermal sensor array, electronic apparatus including the thermal sensor, and operating method of the thermal sensor

A thermal imaging camera comprising:

• an infrared optical system configured to form a thermal image of an object;
• and
• a thermal sensor arranged at a focal distance of the infrared optical system on which the thermal image is imaged,
• wherein the thermal sensor comprises:
• a first region onto which first infrared light is incident;
• a visible light radiation region configured to emit visible light that is generated in response to the first infrared light being incident on the first region;
• a second region onto which the thermal image is incident;
• and
• an image sensor provided at a position to receive the visible light emitted from the visible light radiation region, and
• each of the first region, the second region, and the visible light radiation region comprises a nonlinear optical material.

An operating method of a thermal sensor, the operating method comprising:

• receiving visible light emitted from a resonator of the thermal sensor before shifting of a resonant wavelength of the resonator to obtain first data about a first visible image of the resonator;
• receiving visible light emitted from the resonator after shifting of the resonant wavelength of the resonator due to incidence of external infrared light onto the resonator to obtain second data about a second visible image of the resonator;
• obtaining, based on the first data and the second data, third data about shifting of the resonant wavelength of the resonator due to the incidence of the external infrared light;
• and
• determine, based on the third data, a temperature of the resonator and an intensity of the external infrared light on the resonator due to the incidence of the external infrared light.