[youtube]http://www.youtube.com/watch?v=cMFR-Vwg924[/youtube]
Acoustic Ruler Pro is a very interesting application for iDevices that allows users to measure the distance between terminals using simple sounds. The concept is similar to the one used in sonar devices, that is, the device emits a sound, takes the one coming back from the other iDevice and calculates the distance between the devices. The idea is interesting, but it only works between iDevices that have a microphone included and are able to emit sounds. Regarding the maximum distance that can be measured, we are talking about 25 meters, more than enough to measure anything.
The app works by clocking the time delay of the emitted sound waves. There are two different operation modes: a single device operation (with headphones) and a dual device mode for measuring the distance *between* two devices. Read below to find out which modes work on your iOS device. The app lets you set the air temperature as an additional calibration. This is important, because the speed of sound varies considerably with temperature, affecting the precision of the measurements. You can switch between displaying the measurement in feet/inches and meters/centimeters. Accordingly, the air temperature will either be set in degrees fahrenheit or celsius.
Acoustic Ruler Pro is available in the AppStore for €0.79.
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Acoustic Ruler Pro
0.79
Description: Wouldn't it be amazing to have a ruler in your pocket all the time Well now you can! Measure distances of up to 25 meters (82 feet) with two devices or up to 1.10 meters with one device and headphones.
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