Patent ID: 7048437

Claim:
Process for detecting infrared radiations emitted by a region of a human body and establishing the thermal level of such region, such process being carried out by using an infrared thermometer comprising: a main holding body; detecting means for detecting infrared radiations operatively associated with the main holding body, said detecting means having at least one sensor member of infrared-radiation intensity and at least one waveguide having a first end ready to be turned towards the region of the human body the temperature of which is wished to be known, and a second end turned towards said sensor member, said waveguide having an inner surface defining a passage for bringing into communication first and second openings opposite to each other, the openings being limited by respective borders and said inner surface having at least one portion converging in the direction of the second opening, said convergent portion of the waveguide comprising at least two lengths that are axially consecutive to each other, in which the length which is the closest to the second opening has a greater convergence than the other length; said process comprising the steps of: arranging said infrared thermometer so that the first end of said waveguide be turned towards the region of the human body and the radiations pass through the first opening of the inner surface; avoiding that radiations marked inclined with respect to a longitudinal axis of the waveguide reach the sensor member; conveying the radiations parallel or slightly inclined relative to the longitudinal axis of the waveguide towards the sensor member of the detecting means, reading the thermal level of the radiations conveyed to the sensor member; establishing the thermal level of the region.