All events will take place in the Small Hall of the main building of the University of Latvia, Rainis blvd. 19, Riga, Latvia
Favorite Lecture Demonstrations with Optics and Acoustics
Richard W. Peterson, Bethel University, St. Paul, MN 55112, petric@bethel.edu, 651-638-6465
Lecture demonstrations have impacted the lives of many who work in optics as they can often inspire the creative and experimental part of our discipline, while also adding important insights beyond those of abstract equations. We will consider two such demonstrations and the optical applications that they have inspired. One demonstration will convey both the curse and metrological potential of optical feedback into a simple He-Ne laser, leading to knowledge of longitudinal mode structure and the polarization of adjacent modes, while becoming a powerful time-honored interferometric tool as a “coupled-cavity” interferometer(a,b)Secondly, we will consider how exhaustive optical diagnostics (heterodyne interferometry, knife-edge shock measurements, and pulsed Schlieren) of the spectacular ping-pong cannon demonstration have combined with a one-dimensional numerical simulation to yield a fascinating understanding of the key role played by propagating shock waves in the explosive exit of the ball from this linear expansion tube(c,d).
(a)Plasma Diagnostic Techniques, Richard Huddlestone and Stanley Leonard, Academic Press, Monographs on Pure and Applied Physics, NY (1965). Ch. 10, p. 461-465. (b)Vibration-resistant direct-phase-detecting interferometers, T. B. Carlson, et al, Applied Optics, 36, No. 28, 1 October 1997.
(c)R. Peterson, B. Pulford, and K. Stein, “The Ping-Pong Cannon: A Closer Look,” The Physics Teacher, 43, January 2005, p. 22-25 (d)G. Olson, R. Peterson, B. Pulford, M. Seaberg, K. Stein, C. Stelter, R. Weber, “The Role of Shock Waves in Expansion Tube Accelerators,” Am. J. Phys, 74 (12), December 2006, p. 1071-1076
Komentāri
No Viesis @ 18.04.2008 11:38
Prieks redzēt arī dažas meitenes starp prezentētājām. Skaitā gan diemžēl daudz mazāk nekā puiši.
No Viesis @ 18.04.2008 13:51
Ja padzēstu daudzās liekās atstarpes būtu daudz pārskatāmāk
No andreass @ 18.04.2008 18:47
mazliet palaboju, tagad ir pārskatāmāk.
BTW. Ļoti iesaku atnākt uz vieslektora Richard W. Peterson lekciju, ja pārējās prezentācijas būs ar diezgan specifisku ievirzi, tad vieslektora lekcija solās būt visiem saprotama un interesanta.
No Viesis @ 30.08.2011 14:24
Hey, that\'s the gertaset! So with ll this brain power AWHFY?
