Patent ID: 7525092

Claim:
An infrared sensor comprising: a base plate having a membrane portion and a thick portion; a thermocouple unit having a hot side contact member formed on the membrane portion and a cool side contact member formed on the thick portion, said thermocouple unit generating electromotive force, thereby detecting infrared radiation on said membrane portion; a heater formed near said thermocouple unit, wherein the heater has a pair of input terminals to which test voltage is applied to heat a portion of said thermocouple unit; a hot side thermo-sensitive resistor formed on said membrane portion, wherein the hot side thermo-sensitive resistor has a pair of input terminals to which an amount of current is supplied from outside to measure a voltage drop thereof when the test voltage is applied to the heater; and a cool side thermo-sensitive resistor formed on said thick portion, wherein the cool side thermo-sensitive resistor has a pair of input terminals to which an amount of current is supplied from outside to measure a voltage drop thereof when the test voltage is applied to the heater, and wherein said heater, hot side thermo-sensitive resistor and cool side thermo-sensitive resistor are made of the same material as one of the hot side contact member and the cool side contact member.