Building Earth Observation Cameras

65Imaging Optics

differential thermal expansion between the mirror material and supporting

structure but does not offer sufcient isolation to the mounting stresses while

attaching the mirror support to the telescope structure. To minimize the transfer

of mounting stress to the mirror, the planarity of the mounting face of the ring

and mounting location on the structure where it is mounted should match with

a high degree of tolerance.

3.5.3.1 Bipod Mounts

A bipod consists of two support members arranged in the form of an

inverted “V” (Figure 3.18a). To have higher exibility, local areas are

Flexure

(c)

(b)

(a)

Virtual pivot point

Pad for mirror

at ...