After gathering LEGO and LEGO MINDSTORMS pieces, expect the building process to take 2-3 minutes.įigure 3. Build an ultrasonic device as shown in Figure 3, such that each group has one for its use.Gather materials and make copies of the Distance and Time Worksheet, one per student.In other words, distance = time x velocity. Knowing the round-trip time and the wave speed in the medium (air, water, etc.), the device calculates the distance traveled. What does an ultrasound sensor measure? An ultrasonic sensor measures the time that waves take to travel, reflect and come back to the sensor. Similarly, ships scanning the ocean floor for sunken submarines, planes or wrecks send ultrasonic pings, or ultrasound waves, that reflect off the surfaces and return back to the sensor. In this case, the ultrasound waves are used to calculate the shape of the tiny baby's body by measuring the distances from the sensor to the fetus inside the mother. This range is known as ultrasound since the frequency is above (ultra) the sound humans can hear. For example, when making a sonogram of fetuses, nurses use ultrasound frequencies (about 2–18 MHz, where one MHz or megahertz is equal to 1,000,000 Hz). Sound frequencies below and above the human threshold have been used for engineering and medical purposes worldwide for more than 50 years. LEGO MINDSTORMS NXT robot, such as the NXT Base SetĬopyright © 2012 Irina Igel, Polytechnic Institute of NYU.Note: This activity can also be conducted with the older (and no longer sold) LEGO MINDSTORMS NXT set instead of EV3 see below for those supplies: Distance and Time Worksheet, one per person.various LEGO pieces to attach sensor to EV3 brick.(optional) PING))) Ultrasonic Distance Sensor available at Parallax, Inc.LEGO MINDSTORMS Education EV3 Core Set available at.(optional) Tone Generator app (free for Apple devices, download at: ), or audio frequency recordings (available at Wikipedia: ).(optional) Android or Apple smartphone/tablet computer.thermometer, to measure room temperature.Measuring Distance with Sound Waves Presentation, a PowerPoint file.Systems can be designed to cause a desired effect.Īlignment agreement: Thanks for your feedback! Science and engineering complement each other in the cycle known as research and development (R&D).Īlignment agreement: Thanks for your feedback! Modern civilization depends on major technological systems.įor the teacher's introductory presentation and activity preparation: They are essential tools for producing, transmitting, and capturing signals and for storing and interpreting the information contained in them. Information can be digitized (e.g., a picture stored as the values of an array of pixels) in this form, it can be stored reliably in computer memory and sent over long distances as a series of wave pulses.Īlignment agreement: Thanks for your feedback! Photoelectric materials emit electrons when they absorb light of a high-enough frequency.Īlignment agreement: Thanks for your feedback! Multiple technologies based on the understanding of waves and their interactions with matter are part of everyday experiences in the modern world (e.g., medical imaging, communications, scanners) and in scientific research. about phenomena and/or the process of development and the design and performance of a proposed process or system) in multiple formats (including orally, graphically, textually, and mathematically).Īlignment agreement: Thanks for your feedback! This activity focuses on the following Three Dimensional Learning aspects of NGSS:Ĭommunicate technical information or ideas (e.g. Identify the frequency range for human hearing, known as the audible range.Ĭommunicate technical information about how some technological devices use the principles of wave behavior and wave interactions with matter to transmit and capture information and energy.Ĭlick to view other curriculum aligned to this Performance Expectation.Convert units, such as seconds into microseconds.Give examples of ultrasound applications in technology and everyday life.
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