Motion Sensor II

Motion Sensor II

The Motion Sensor II uses ultrasonic pulse technology to measure the position, velocity and acceleration of its target. It can be mounted to PASCO carts, dynamics tracks, rod stands or used on tabletops.
The "Narrow Beam" setting, for distances from 15 cm to 2 m, provides cleaner data by rejecting false target signals or ignoring air track noise. Use "Standard" setting for distances from 15 cm to 8 m.

Shorter Dead Zone:

• Detects targets as close as 15 cm from the sensor increasing the effective length of a dynamics track (other motion sensors have a dead zone of 42 cm).

False Target Rejection Circuit:

• Reduces false signals from objects near the target's path of motion, giving cleaner data.

PASCO also offers an adapter (CI-6748) if you need to use this sensor with another interface.

Typical Applications

• Experiments in which both speed and direction are required
• Study conservation of energy and momentum during collisions
• Monitor the sinusoidal motion of a mass on a spring
• Monitor the motion of large objects, such as a student

Features

• Switch selectable short range and long range settings
• Shorter Dead Zone: Detects targets as close as 15 cm
• False Target Rejection Circuit: Reduces false signals from nearby objects
• Snaps onto PASCO dynamics tracks or mounts directly to rods for easy positioning

How it Works

When triggered, the electrostatic transducer in the motion sensor transmits a burst of 16 ultrasonic pulses with a frequency of about 49 kHz.The ultrasonic pulses reflect off an object and return to the sensor. The target indicator on the sensor flashes when the transducer detects an echo.

The interface measures the time between trigger rising edge and the echo rising edge. DataStudio uses this time and the speed of sound to calculate the distance to the object. To determine velocity, DataStudio uses consecutive position measurements to calculate the rate of change of position. Similarly with acceleration.