Develop hardware and software to make distance measurements using ultrasonic signals. The main goal is to use the signals to create 2D and 3D images at short ranges and in confined spaces.https://digitalcommons.mtech.edu/urp_aug_2018/1005/thumbnail.jp

Gildehaus, Liam

Hill, Bryce

English

Digital Commons @ Montana Tech

Montana Tech LibraryDigital Commons @ Montana Tech2018 Undergraduate Research Other Undergraduate ResearchSummer 2018Short Range Imaging Using Ultrasonic SignalsLiam GildehausMontana TechBryce HillMontana TechFollow this and additional works at: https://digitalcommons.mtech.edu/urp_aug_2018This Book is brought to you for free and open access by the Other Undergraduate Research at Digital Commons @ Montana Tech. It has been acceptedfor inclusion in 2018 Undergraduate Research by an authorized administrator of Digital Commons @ Montana Tech. For more information, pleasecontact sjuskiewicz@mtech.edu.Recommended CitationGildehaus, Liam and Hill, Bryce, "Short Range Imaging Using Ultrasonic Signals" (2018). 2018 Undergraduate Research. 6.https://digitalcommons.mtech.edu/urp_aug_2018/6 Short Range Imaging Using Ultrasonic Signals Liam Gildehaus and Bryce Hill Project Overview  Develop hardware and software to make distance measurements using ultrasonic signals.  The main goal is to use  the signals to create 2D and 3D images at short ranges and in confined spaces.  Hardware  Teensy 3.6 Microcontroller and Audio Shield  Microphones and Speakers  Microphone amplifier PCB (Printed Circuit Board) Software Methods  Tested microcontroller’s ability to  play audio  Developed code to play and record audio simultaneously  Tested different microphones and speakers between 5 kHz and 42 kHz  Designed hardware setup and performed distance measurements   Compared results and determined ideal frequency range  Cross-correlated input and output signals   Arduino     Multisim Audacity Ultiboard  Matlab Figure 1. Microphone Amplifier PCB Results  Evaluated three speakers with similar input signals  Lowered the signal frequency from 40 kHz down to 25 kHz  Increased I2S sample rate from 44.1 kHz to 176 kHz  Maximum resolution for distance measurements is to nearest 2 mm Piezo Buzzer Figure 2. Speaker Comparison Earbud Speaker Knowles Speaker  Conclusions  The piezo buzzer exhibited undesired ringing  Identified signal frequency range Future work  Find a more suitable speaker  Obtain accurate distance measurements  Expand to an array of 2 microphones and speakers Acknowledgments This work was support by Montana Tech’s Summer undergraduate Research Fellowship (SURF).    Figure 3. Cross Correlation of  output and input 

Short Range Imaging Using Ultrasonic Signals

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Short Range Imaging Using Ultrasonic Signals

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