Regulating temp. of laser radiation directed to biological tissue - measuring IR radiation emitted from latter exclusively in spectral range of atmospheric window

摘要

In surgical cutting or removal of biological material, the temp. of the material is controlled in an arrangement of a detector or detector array (6) on which the radiation (2.1) emitted by the material is focussed by a lens (4), beam splitter (3) further lens (10), band-pass filter (5) and aperture shutter (7). The detector signal is amplified (8) and fed in a control circuit (17) to regulate laser output. The intensity of laser radiation is measured in spectral ranges between 2 and 2.6 microns, 3 and 4 microns or 7 and 9 microns. ADVANTAGE - Continuous operation possible with optimum output density.