Internet Laboratory of Physics

1. Internet Laboratory of Physics internetowe Laboratorium Fizyki Authors: dr Jan Grabski, Wojciech Chojnacki, Maciek Kański, Paweł Stępień, Paweł Picewicz First step Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

2. Internet Laboratory of Physics • Outline: • Software architecture • Experiments • Accessibility • Laboratory demonstration Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

3. Internet Laboratory of Physics Software Architecture • 3 layers architecture Client Experiment Server Client Experiment Client Internet Internal network Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

4. Internet Laboratory of Physics Software Architecture • Easy software development • you can write own experiment and client software with any network-able language (C, C++, Fortran, Java, Perl, Python,etc.) Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

5. Internet Laboratory of Physics Software Architecture • Security • Users from internet don’t have direct access to experiment server. Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

6. Internet Laboratory of Physics Software Architecture • Scalability • You can use one strong server with many light experiment computers or many light servers connected into virtual network in different locations (this feature will be implemented in near future). Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

7. Internet Laboratory of Physics Software Architecture • Portability • Our software is created in Java - platform independent language Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

8. Internet Laboratory of Physics Software Architecture • Server • written in Java • it is a proxy between experiments and client software • easy to extend • it doing all work for experiments software (users authorization, chat server, data cache, multi users network communication, and everything else what we wouldn't implement in experiment software. Nantes 28.09.02 Faculty of Physics Warsaw University of Technology

9. Internet Laboratory of Physics Software Architecture • Protocol • plain text - easy to implement • human readable command • open - everyone experiment can use own specific commands • based on ideas from SCAPI protocol • example: • *LAB:SET_VOL <val> - set voltage to power supplier • *LABBIND <experiment id> - connect to experiment with id • *CHAT <txt> - send chat message to everyone Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

10. Internet Laboratory of Physics Software Architecture • Experiment software • easy to create • libraries in C and Java • authors can focus on experiment programming not on all dirty stuff like multi processing, users authorizations, cache, deamons, etc. Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

11. Internet Laboratory of Physics Software Architecture • Client software • java interfaces and components • client as java applet and application • simple client in php and perl Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

12. Internet Laboratory of Physics Software Architecture Our goal is to create powerful platform for experiments realisation in distance learning technology. We think, that this software can be used not only in physics experiments but also in other applications - knowledge tests, exams, etc. Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

13. Internet Laboratory of Physics Experiments • This laboratory is designed to make a experiments located at Faculty of Physicsat Warsaw University of Technology and other Universities (or schools) which will connect their apparatus and software to Internet Laboratory of Physic. • We are going to present only the most interesting and most important experiments in history of physics. Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

14. Internet Laboratory of Physics Experiments • Roentgen radiation (continuous and characteristic spectrum, crystal constant’s evaluation, radiation absorption, Moseley law). • Photoelectric effect (internal, external, Einstein law, Planck constant evaluation) • Nuclear radiation (Compton effect, positron’s annihilation) • Rutherford experiment (scattering of alpha-particles) • Stern – Gerlach effect (spin of atoms, mass detection of ions, high vacuum) • Franck – Hertz experiment Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

15. Internet Laboratory of Physics Experiments • Black body radiation • Doppler effect • Energy band gap in semiconductors • Magnetic hysteresis • Requested experiments: computerized measurement stand (controllable feeders and heaters, voltage-meters, digital oscilloscope and so on) will allow realization (after administrator and physicist agreement) of basic measurements of some physical properties (for example: condenser discharge curve, diode characteristics, temperature characteristics of semiconductor) Nantes 29.03.02 Faculty of Physics Warsaw University of Technology

16. Internet Laboratory of Physics Accessibility • Open to every one • There are two kind of internet users: • -Operator:for specified time, gets the operator's privileges, which allow him to perform a particular experiment with full possibilities for remote control of experiments • -Spectator: can watching on experiment and results, can communicate with operator via chat, can receive results of experiment but could’nt influence on experiment • Operaror should make reservation of time for choosen experiment Nantes 29.03.02 Faculty of Physics Warsaw University of Technology