In this application, the camera and the laser are mounted on
a turret that enables viewing in all possible coordinates in space. For the purpose of Boresighting, the
turret has a pre-determined position that enables the laser and the camera
system to view the laser target through the Boresighting System. The camera, focusing on a cross hair, must
display the focused dot from the laser on the cross hair. Mechanical means are required to tip
and tilt the laser to bring the laser dot to the center of the cross hair.
In
order to achieve this alignment, a Lateral Transfer Hollow Periscope (LTHP), with
total beam deviation in the magnitude of single arc seconds, can be used. The accuracy of the LTHP is a critical
requirement for the system; and it must be maintained under the environmental
condition in which the system is operated and throughout the lifetime of the
instrument.
Figure 2. This
diagram (on the following page) illustrates the same concept utilizing a
Lateral Transfer Hollow Retroreflector (LTHR).
Figure 3. This
basic diagram shows Boresighting procedures between a gun barrel and a
gunsight. This method of
Boresighting is as follows: a collimator that is focused on a cross hair is
inserted into the bore. As
described above, great accuracy is required between the inside diameter of the
barrel and the outer diameter of the collimator.
Continued
