Infrared human body radiation induction alarm

The utility model discloses an infrared human body radiation induction alarm. The output terminal of a thermoelectric inductor is connected with the input terminal of an amplification circuit by a capacitor, and the output terminal of the amplification circuit is connected with the input terminal of a four-operation amplifying circuit successively passing through a resistor and a capacitor. The output terminal of the four-operation amplifying circuit is connected with the input terminal of a four-NAND gate circuit by a diode, and the output terminal of the four-NAND gate circuit is connected with the input terminal of a drive circuit successively passing through a resistor, a diode and another resistor. Two relays are arranged in the drive circuit in series connection, wherein, a normally open contact of one relay is arranged between an audio circuit and a power circuit in series connection, and a normally open contact of the other relay is arranged in a lighting circuit in series connection. The utility model has the advantages of high sensitivity, high adjustability, no leakage alarm, no false alarm and large alarm sound. The utility model can also carry out alarm to the fire hazard within 20 meters, and the audible range at night is more than 500 meters. The utility model is particularly suitable for used as an alarm device at a fish pond or a farmyard in the countryside.