Real Time Data Acquisition via the Internet.
Contributed talk, American Association of
Physics Teachers meeting, New Orleans, January, 1998.
Ý
About us:
Charles Clark (cclark@venus.net)
Kyle
Forinash (kforinas@ius.edu -will give the talk in New Orleans)
Ray
Wisman (rwisman@ius.edu)
Natural Sciences Division
Indiana University Southeast
4201 Grant Line Rd.
New Albany, IN 47150
Abstract:
Distance learning has gotten much attention in the past few years, particularly
from college and university administrators who hope to offer educational
services to students who are not physically present on campus. Among many
of the problems to be solved in trying to offer learning opportunities
at a distance is the question of laboratory exercises. We present here
two examples of ways to offer some laboratory experiments which involve
real time data collection via the internet. The idea is to make accessible
via the internet, experimental apparatus and real time data acquisition
from equipment which would not otherwise be available to students because
of time or resource constraints such as location of the equipment, expense
of the apparatus (or number of set-ups), duration of the experiment, staffing
problems, etc.
Project one: ULIanyWhere
(R. Wisman & K. Forinash)
Ý
What is it:
-
ULIanyWhere provides data collection over the Web using a ULI (Universal
Lab Interface). Normally the ULI, a popular A/D data collection tool from
Vernier Software, is connected to
a local computer serial port and only that computer can use it. We have
written a JAVA applet which extends the ULI connection to the Web so that
any JAVA-capable browser can control a ULI on another computer located
anywhere on the internet.
-
Any probe which works with the ULI can be used (temperature, voltage, sound,
motion, etc.).
-
The digital output on the ULI can be used to turn remote equipment on and
off either before, during or after data collection.
Ý
Equipment/Software used:
-
Universal Laboratory Interface (ULI) from: Vernier
Software (8565 S.W. Beaverton-Hillsdale Hwy. Portland, OR 97225-2429).
-
TCP/IP to Serial software - For Mac or PC to connect the ULI on the serial
port to the Web via TCP/IP.
Try it:
-
Click here to see a working example of the ULIanyWhere.
(Currently this site has a ULI hookedup to a microphone sitting in front
of a frequency generator and speaker. Default settings in the program will
return a picture of the sound wave.)
Project two: Remote Video Capture
(C. Clark & K. Forinash)
Ý
What is it:
-
We have set up a remote video capture site which provides students with
the experience of working with video captured data remotely. Users accessing
the site activate a video capture of some real time motion.
-
The server downloads still selections from the captured video (currently
5 pictures) to your browser.
-
The stills are loaded into a JAVA applet which allows you to calibrate
a scale for the picture and determine the location of objects in the pictures
according to the scale you have set.
-
Once you have recorded the location and time of the object in each frame
you can calculate the velocity and acceleration of the object (using your
own graphing and calculating tools- these are not supplied by the server
at this time).
-
An entire class can have the experience of video capture and analysis using
only one video camera.
Ý
Equipment/Software used:
-
AppleScript provided with MacOS 7.5 and later.
-
NetPresenz 4.0 server software 10$Ý shareware from Stairways
software.
-
MacWebCam from Reardon.com 25$ Shareware for educational site ( may now
be unavailableÝ software replaced by SiteCam 129$).
-
Power Macintosh 8500 @ 120 MHz with Video Card.
-
Sony HandyCam video camera.
Try it:
-
Click here to see a working example of the Remote
Video Capture. (NOTE: We cannot keep this site running continuously
so you may only see the clock moving. Eventually we hope to have several
continuosly moving objects so that students can analyze several different
kinds of motion.)
Return to the IUS
Physics Top Page.
Contact Kyle Forinash, kforinas@ius.edu,
for comments/suggestions/corrections.