Signal acquisition and processing circuit system of laser energy meter

The invention discloses a signal acquisition and processing circuit system of a laser energy meter, which comprises a thermocouple acquisition unit circuit, an RTD acquisition unit circuit, a photodiode acquisition circuit, a complex programmable logic device, a communication circuit, an isolation power supply and a pi-type filter circuit, the signal input end of the thermocouple acquisition unit circuit is electrically connected with a plurality of thermocouples through thermocouple connectors, the signal input end of the RTD acquisition unit circuit is electrically connected with a plurality of resistance temperature detectors through RTD connectors, and the signal input end of the photodiode acquisition circuit is electrically connected with a plurality of photodiodes through photodiode connectors. The signal output ends of the three are electrically connected with the signal input end of the complex programmable logic device, and the signal output end of the complex programmable logic device is electrical