sir, making small holes for consecutive depth from the surface of the rock sample for placing thermocouple during rock drilling operation. is there any technical thing should do. why we need to place thermocouple, maintaining some distance from one hole to another hole or take some depth. is there any paper related to embedded thermocouple methods. please do the needful sir.

some doubt about why this much depth required to place thermocouple during drilling and why thermocouple should place some distance from the drill bit to measure.