The Distance Probe uses the same technology that Polaroid Cameras and similar devices use to measure the distance to an object. In the case of the camera, the distance-sensing device allows the camera to use the appropriate settings to take a focused and normally exposed picture. The Distance Probe uses this technology to make similar calculations with an accuracy of ± 7 mm over its entire temperature range (0 ºC to 52 ºC).
The range of the Distance Probe is 0.4 m to 10 m; therefore, certain considerations must be taken into account when making your predictions to ensure you create scenarios that can be measured accurately. Your Distance Probe uses ultrasonic pulses (sound) to measure the time it takes to send out a pulse and wait for that sound wave to bounce off an object and return to the source-the Distance Probe. Knowing the speed of sound, the software is able to calculate any object's position, velocity, and/or acceleration.
In this experiment, you will be asked to reproduce a number of Distance vs. Time graphs while walking back and forth in front of the Distance Probe. To begin this experiment, make yourself familiar with and practice using the Prediction Line in Excelerator. This is one of the functions of the right mouse button that allow you to analyze your graph data.