On Thu, 25 Oct 2007 08:43:29 +0000 (UTC), bz
wrote:

HW@....(Dr. Henri Wilson) wrote in
:

The sensible thing to do is use monochromatic light and tilt the top
miror slightly in order to produce an 'optical wedge' effect. That
produces a straight line fringe pattern rather than circles. Straight
lines are easier to count than circles and in the case of gyros, make
the direction of an acceleration easy to determine.

Henri, the image is a vertical line surrounded by fainter vertical lines.
The fringes are vertical lines because they are images of the slit.

Crap. We were talking about the MMx and four mirror sagnac. Lines rather than
circles appear if the top mirror is angled slightly to form an optical wedge.
This was a popular version of the MM interferometer.


Why would you think they are circles?

No wonder you are so confused about Sagnac. Your mind keeps running around in
circles.

Don't try to discuss things you know nothing about, bob.



Henri Wilson. ASTC,BSc,DSc(T)

www.users.bigpond.com/hewn/index.htm