There is some info at http://www.keyence.com/products/sensors/ultrasonic/ultrasonic.php. They are a manufaturer of them.
Search Google, I got 445 000 hits for "ultrasonic vibration".
Ultrasonic sensors are commonly used to measure distance by sending out sound waves and detecting when they bounce back. They are frequently used in robotics for obstacle avoidance, level sensing, and distance measurement applications.
Find the manufacturers information from the different vendors through NAPA or O'Reilly's. Then you can typically find the information via the web.
How do animal use ultrasonic sounds to find their way or to catch food
Ultrasonic thickness gauges can be found at any Grainger like store the reason you would need this type of gauge is if you are measuring coating or linings . The model type that would be best for you would need to be determined by the type of material you are working with.
You can find them on braindex.com. You can also try looking on www.tradekey.com.
You can find this information at www.autozone.com Click component location.
Your best bet would be to buy a used cheap ultrasonic thickness wall gauge on ebay or amazon.com You can also look at ones ranging from 1000-2000 dollars at http://www.instrumart.com/ProductList.aspx?CategoryID=5754&Landing=1&s_kwcid=TC|23075|ultrasonic%20thickness%20gaugeS|e|7537765444&gclid=CM_ZmLrwyKoCFcPBKgoddi8w2A
It will tell you the exact distance of the laser. They don't mess up, and you can purchase one and also find out more information here http://www.keyence.com/products/sensors/laser/laser.php
i would find conservation in the
would like to know where the speedometer sensors are on a 1999 villager
I would search on the internet and find sites that offer that kind of information. that would be the best way to find the information that your looking for. Any car lots would have this information as well.