Infrared thermo detector is a kind of non-contact instrument used to measure the surface temperature of objects. It incorporates high technologies of optics, infrared and electronics, and has been increasingly popularized in China. Firstly, the advantages and shortcomings of ST2L infrared thermo detector were analyzed. Then based on the requirement of detecting buried geological structures in underground coalmines and the features of ST2L, two projects had been studied to modify ST2L: 1) Increasing the resolution of temperature measurements by means of improving the electrical circuit and carrying out field test; 2) Realizing flame protection of ST2L and passing the state-level test and appraisement. In addition, actual application experiments had been carried out for detecting underground buried geological structures (fault, fold, crushing zone, crack, porosity, gas and spontaneous combustion areas, etc.). Some good results have been achieved and valuable conclusions have been drawn.
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