Coke Thermal infrared detection circuit OPA111

An application focus infrared heat is radiated by an object while the object of infrared non-contact temperature measurement, since the detection of the measured signal is very

weak, thus requiring the use of coke thermal infrared sensor sensitivity must be very high, the noise is very small; the same of the amplifier circuit is also very demanding, with the general operational amplifier is unable to meet the requirements. OPA111 structure into focus infrared thermal measurement circuit as shown in FIG. The general structure of the circuit as an operational amplifier, except that the feedback resistor is very large (requires gain is very large); signal pin signal lead and copper traces printed circuit board must make the mask processing. Because the gain of the amplifier is large, if not shielded, then external noise can cause interference.

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