Window for vacuum telescopes: Review of problem areas

Details Window for vacuum telescopes: Review of problem areas Window for vacuum telescopes: Review of problem areas

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982lest.rept..199m&link_type=abstract

In Oslo Univ. LEST: Large European Solar Telescope p 199-204 (SEE N82-32209 22-89)

Physics

Reflecting Telescopes, Structural Design Criteria, Vacuum Tubes, Windows (Apertures), Active Control, Bending Moments, Birefringence, Mechanical Properties, Optical Properties, Temperature Effects, Thermal Stresses, Thickness

Scientific paper

The mechanical properties of a large disk of BK7 glass, and the optical effects of the pressure load and thermal environment are discussed. A 150 cm diameter free window is feasible using BK7. For a maximum bending stress not exceeding 125 kp/sq cm, thickness should be greater than 7.7 cm. Active temperature control of the cell is required to overcome thermal nonuniformities between center and rim and to eliminate birefringence due to thermally induced stress. If multiwindow apertures are used, temperature within the assembly must be constant within 0.1K in the coherent case. The wedge angle of the elements should equal twice the resolution angle for incoherent use. The thickness should equal 0.2 lambda, the amount corresponding to a constant wedge angle for a coherent case window.

Affiliated with

Also associated with

No associations

Rating

Window for vacuum telescopes: Review of problem areas does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Window for vacuum telescopes: Review of problem areas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Window for vacuum telescopes: Review of problem areas will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-842810