caa a22 4500 465783112 CHVBK 20180323112000.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF02441670 doi (NATIONALLICENCE)springer-10.1007/BF02441670 Laser probe temperature control by measuring the returning infra-red radiation [Elektronische Daten] [J. Torres, S. Ghaffari, A. Welch] The metal-tipped fibre or ‘laser probe' developed for angioplasty comprises a metallic probe at the end of an optical fibre. The probe is heated by an argon or Nd: YAG laser and applied against the tissue to be vapourised. The heated probe generates infra-red radiation which is proportional to the temperature of the probe. The paper investigates the feasibility of a feedback control system that measures the temperature of the probe by detecting the infra-red radiation transmitted back through the fibre. The probe was initially heated by physical contact with a hot surface, and then by an argon laser via the optical fibre. The returning IR radiation was sensed by a lead sulphide detector, while probe temperature was simultaneously measured by a thermocouple. Temperatures as low as 200°C were measured through a 5 m long fibre during the laser heating of the probe. The detector signal increased in an exponential fashion as the probe temperature increased. A resolution of 1°C was obtained at a probe temperature of 400°C. It can be concluded that, for the laser probe, it is feasible to use a feedback control system which measures the infra-red radiation transmitted back through the same fibre that carries the heating laser light. IFMBE, 1990 Angioplasty nationallicence Atherosclerosis nationallicence Feedback nationallicence Infra-red nationallicence Laser probe nationallicence Temperature nationallicence Torres J. Biomedical Engineering Program, The University of Texas at Austin, ENS 610, 78712, Austin, Texas, USA aut Ghaffari S. Biomedical Engineering Program, The University of Texas at Austin, ENS 610, 78712, Austin, Texas, USA aut Welch A. Biomedical Engineering Program, The University of Texas at Austin, ENS 610, 78712, Austin, Texas, USA aut Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/1(1990-01-01), 1-7 0140-0118 28:1<1 1990 28 11517 https://doi.org/10.1007/BF02441670 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02441670 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Torres J. Biomedical Engineering Program, The University of Texas at Austin, ENS 610, 78712, Austin, Texas, USA aut NATIONALLICENCE 700 1- Ghaffari S. Biomedical Engineering Program, The University of Texas at Austin, ENS 610, 78712, Austin, Texas, USA aut NATIONALLICENCE 700 1- Welch A. Biomedical Engineering Program, The University of Texas at Austin, ENS 610, 78712, Austin, Texas, USA aut NATIONALLICENCE 773 0- Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/1(1990-01-01), 1-7 0140-0118 28:1<1 1990 28 11517 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer