Two detecting systems based on thermopile and pyroelectric sensors are set up and tested at 10

30

50 ℃ separately.Experimental result is that relative errors of average value are-10.50 % - 11.50 % and 28.00 % - 34.50 % and the relative standard deviations are 0.13 % - 6.89 % and 0.04 % - 5.21 % respectively.The experiment of the thermopile sensor system is poorer than pyroelectric sensor

but temperature drift is small.Through considering the characteristics of sensors and large temperature variations at mud-logging site

it is proposed that the thermopile sensor is more suitable for CO2 detection than the pyroelectric sensor.