Externally mounted temperature calibration device for thermal cameras and temperature measurement system using the same

A method for operating a temperature measuring system having

• a thermal camera unit for measuring a temperature of a subject to be measured, the thermal camera unit being equipped with a thermal camera, and
• an externally mounted temperature calibration device that is located outside the thermal camera unit and includes a temperature measurement substrate which is photographed with the subject by a thermal camera when photographing the subject,
• the method comprising:
• a signal measurement step wherein an image that is photographed by the thermal camera and includes the temperature measurement substrate and the subject to be measured, is transmitted to an operation processing unit, and a temperature of the temperature measurement substrate measured by a temperature sensor that is mounted on a surface other than a surface facing the thermal camera unit in the temperature measurement substrate, is transmitted to the operation processing unit;
• an uncompensated image data storage step corresponding to a storage step of image data before compensation wherein the operation processing unit temporarily stores the image which is photographed by the thermal camera in the signal measurement step and which includes the temperature measurement substrate and the subject to be measured, in the memory unit, as uncompensated image data before compensation;
• an image data detection step of the temperature measurement substrate wherein the operation processing unit detects image data of the temperature measurement substrate from the uncompensated image data before compensation, and temporarily stores it in the memory unit;
• a step of temperature detection by the temperature sensor, wherein the operation processor derives a temperature at a same time point as temperature data of the image data detection step of the temperature measurement substrate, from temperatures detected through the temperature sensor in the signal measurement step, and stores it temporarily in the memory unit as a temperature value of the temperature measurement substrate measured by the temperature sensor;
• and
• a step of temperature detection of the temperature measurement substrate by the thermal camera, wherein the operation processing unit detects the temperature of the temperature measurement substrate measured by the thermal camera, from the image data of the temperature measurement substrate detected in the image data detection step of the temperature measurement substrate;
• wherein in a temperature correction step, the operation processing unit obtains a difference between the temperature value of the temperature measurement substrate by the temperature sensor and the temperature value of the temperature measurement substrate by the thermal camera, as a compensation value, and performs a correction by subtracting the compensation value from the uncompensated image data before compensation obtained in the uncompensated image data storage step.