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World Earthquake Report for Thursday, 24 September 2026
• Moderate mag. 4.3 earthquake - Madagascar: Mozambique Channel on Thursday, ...
• Small magnitude 3.9 earthquake hits near Hastings, Hastings District, Hawke...
• Volcano earthquake report for Thursday, 24 September 2026
• Light mag. 3.9 earthquake - South Pacific Ocean, 10.2 km south of Hastings,...
• Moderate magnitude 4.1 quake hits 31 miles southeast of Midland, Texas, Uni...
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#481327
Tue 27 Nov 2018 03:17:PM
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Joined: Feb 2001
Posts: 678,977
Launch Director
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Launch Director
Joined: Feb 2001
Posts: 678,977 |
Abstract: Currently there is a strong desire to make Earth science less expensive. Freeform optics make these missions less expensive because they allow an optical designer to use fewer mirrors to create roughly the same effect. The main issue with using freeforms is how closely the substrate can be milled to its prescription. Over this summer, our team looked at two freeforms made by Corning Inc. using a brand new process to determine how close these optics are to their set prescriptions and how well... Source: Alignment and Testing for a Freeform Telescope
David Cottle
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Alignment and Testing for a Freeform Telescope
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