See still photographs and detailed explanations.

What you should do to see a video clip:

1. (Optional) You may want to select a music file to download and play it first if you are not using a broadband internet connection - these are midi files so you will need a soundcard with midi support. The music should start playing automatically. If it doesn't work - don't worry its not an essential step.
2. Choose a video clip (right mouse button) and download it to a temporary directory on your hard-disk (you will need a few megabytes free). You will be prompted to ask if you want to play it or save it - choose to save the file.
3. Once the file has downloaded you might choose to download some others or all of them.
4. Using your computers file manager (Windows Explorer) find the files you downloaded (.mpg file extension) and run them. Nearly all PCs can show these clips in .mpg compressed format. Hint: if you have been downloading the files one after the other you may need to refresh Windows Explorer to get it to show the latest file - this can be done from the menu or conveniently with the F5 key.

Music You can listen to some music while you download. Please select a music clip before selecting a video clip.	Action
Relaxing music	Click here
Acoustic guitar music	Click here
Strange music	Click here
Very strange music	Click here

Title of video	File length	Clip length	File name to download	Time to download (56 K modem)
1. Waves at 1.5 MHz in water scattering from a solid cylinder of aluminium. Strongly recommended - see still images for more details.	858 KB	~6 s	cylinder.mpg	~5 minutes
2. Waves at 1.5 MHz in water reflecting from an aluminium plate with reverberations. Recommended.	844 KB	~6 s	hydroph.mpg	~5 minutes
3 A pulse of waves at 1.5 MHz after reflecting from an aluminium plate (see previous clip) are detected by a hydrophone. Clip shows signal from the hydrophone synchronised with the visualized image of the waves. Strongly recommended - see still images for more details.	918 KB	~6 s	reflect.mpg	~6 minutes
4. Effect on ultrasonic output of a transducer (0.5 MHz centre frequency) of varying the tone-burst duration at the third harmonic (1.5 MHz).	903 KB	~6 s	transd2.mpg	~6 minutes
5. Effect on ultrasonic output of a transducer (0.5 MHz centre frequency) of varying the tone-burst duration at the fundamental (0.5 MHz).	778 KB	~6 s	transd3.mpg	~4 minutes
6. Effect on ultrasonic output of a transducer (0.5 MHz centre frequency) of varying the excitation frequency over the range 0.5 MHz to 1.5 MHz.	1,335 KB	~9 s	transd1.mpg	~12 minutes

Several video sequences are listed in the table. The video sequences are in black and white with no sound track and compressed using the MPEG standard. This helps to keep file sizes down to around 1 MByte (from around 6 MByte) and the time to download is about 5 minutes using a 56 KBaud modem. There is a significant reduction in image quality.

The image quality of these clips is inferior to the high quality our visualization system produces but the content is typical of how the system is used. In particular, clip 3 tries to give an indication of the power of using a visualized image synchronised with the output of a receiver.

Copyright notice: all video clips are the copyright property of Cambridge Ultrasonics and Instrumentation Innovation Ltd. You are permitted to download these files and view them but you may not incorporate them into any other material or publish them without the written permission of the copyright holder.