Patent ID: 6540389
Filing Date: 2003-04-01
Classification: G02B

Abstract:
A lighting system for illumination of an observation space, in particular an observation space in which a pressurized and/or hot medium is contained, comprising:an optical-fiber cable having a first end which can be connected to a light source, and a second end; a lighting head, which is connected to said second end of said optical fiber cable and which can be introduced into said observation space, wherein said lighting head comprises a removably attachable light guide rod in contact with gases within the observation space and made from a material which is resistant to pressure and temperature; wherein said lighting head is without a protective glass and without a cooling apparatus; wherein said light guide rod is provided at its proximal end with a coupling sleeve for connecting said light guide rod with said optical-fiber cable; and wherein said coupling sleeve is fixed to said light guide rod by means of an adhesive having a refractive index smaller than a refractive index of said light guide rod.