Total transmissibility optical system

A microscope lens for transmitting substantially all of a radiation beam and focusing it to a focal point within a microscope, said microscope lens comprising:

• a first reflector having a generally conical shaped outer reflective surface, the conical reflective surface being oriented so that the axis thereof is generally parallel to the beam;
• a second reflector having a generally paraboloidal inner reflective surface which generally surrounds the first reflector and has an aperture for transmitting the beam of radiation therethrough;
• a third reflector abutting the second reflector and having a generally conical shaped inner reflective surface, the third reflector having an aperture formed by the removal of its apex for transmission of the focused radiation beam therethrough and said second and third reflective surfaces having a contiguous margin;
• and
• a fourth reflector generally surrounded by the third reflector abutting the first reflector and having a generally conical shaped outer reflective surface with the axis thereof generally parallel to the beam, and said first and fourth reflective surfaces having a contiguous margin, the four reflectors cooperating to focus the beam of radiation to a point.

Apparatus for focusing a beam of radiation to a focal point, said focusing apparatus comprising:

• an outer member further comprised of a first inner reflective surface generally in the shape of a hollow segment of paraboloid of revolution and a second inner reflective surface generally in shape of a hollow truncated cone, the base of the first inner reflective surface being joined to the base of the second inner reflective surface such that two apertures are provided at opposed ends of the outer member;
• an inner member further comprised of two generally conical outer reflective surfaces joined at their respective bases such that their vertices are directly opposed and their axes are generally parallel to the radiation beam;
• and
• means for coaxially securing the inner member within the outer member such at one of each of said vertices of said outer conical reflective surfaces of the inner member is disposed adjacent one of each of said apertures of said first and second inner reflective surfaces of the outer member, whereby said beam of radiation entering the apparatus through one of said apertures at one side is brought to a focus at a point on the opposite side.

An inspection device for a nuclear reactor vessel, said inspection device comprising a camera having an optical system for transmitting and focusing substantially all of a light beam therein and constructed of a material which is substantially resistant to radiation, means for positioning the camera within the reactor vessel, and means for viewing images received by the camera at a remote location, wherein said total transmissibility optical system further comprises:

• a first reflector having a generally conical shaped outer reflective surface, the conical reflective surface being oriented so that the axis thereof is generally parallel to the light beam;
• a second reflector having a generally paraboloidal inner reflective surface which generally surrounds the first reflector and has an aperture for transmitting the light beam therethrough;
• a third reflector abutting the second reflector and having a generaly conical shaped inner reflective surface, the third reflector having an aperture formed by the removal of its apex for transmission of the focused light beam therethrough and said second and third reflective surfaces having a contiguous margin;
• and
• a fourth reflector generally surrounded by the third reflector abutting the first reflector and having a generally conical shaped outer reflective surface with the axis thereof generally parallel to the light beam, and said first and fourth reflective surfaces having a contiguous margin, the four reflectors cooperating to focus the beam of light to a point.