Patent ID: 7490980

Claim:
A method for calibrating an infrared thermometer, which obtains a sensitivity S of a radiation sensor of an infrared thermometer and a reference resistance R O of an ambient-temperature sensor of said infrared thermometer, comprising steps: using said infrared thermometer to detect a first test object having a first given temperature T S 1 in an environment having a first ambient temperature T U 1 to obtain a first output signal U 1 of said radiation sensor and a first resistance RT U 1 of said ambient-temperature sensor; using said infrared thermometer to detect a second test object having a second given temperature T S 2 in an another environment having a second ambient temperature T U 2 to obtain a second output signal U 2 of said radiation sensor and a second resistance RT U 2 of said ambient-temperature sensor; and using said first given temperature T S 1 , said second given temperature T S 2 , said first output signal U 1 , said second output signal U 2 , said first resistance RT U 1 , and said second resistance RT U 2 to work out said reference resistance R O of said ambient-temperature sensor, and using said reference resistance R O to work out said first ambient temperature T U 1 and said second ambient temperature T U 2 , and using said first ambient temperature T U 1 and said second ambient temperature T U 2 to work out said sensitivity S of said radiation sensor.