Sökning: "Ultrasonic Microphone"

Hittade 5 uppsatser innehållade orden Ultrasonic Microphone.

  1. 1. An Investigation of Methods for Flow Measurements in a Gasketed Plate Heat Exchanger for Predictive Maintenance

    Master-uppsats, Lunds universitet/Avdelningen för Biomedicinsk teknik

    Författare :Viktor Ekström; [2022]
    Nyckelord :gasketed plate heat exchanger; electrical measurements; sensors; predictive maintenance; machine learning; Technology and Engineering;

    Sammanfattning : For a company to stay relevant in the long term, it is essential to keep up with the latest technology and continuously consider new innovative solutions for improving products and services. The gasketed plate heat exchanger (GPHE) is a mechanical device, and this work attempts to investigate different possibilities for incorporating sensor devices and predictive maintenance systems to improve the device. LÄS MER

  3. 2. Investigation of Light and Ultrasound Injected Signals in Microphones

    Master-uppsats, Linköpings universitet/Elektroniska Kretsar och System

    Författare :Robin Djerv; [2021]
    Nyckelord :LightCommands; DolphinAttack; MEMS Microphone; Signal Injection; Security;

    Sammanfattning : Voice commanded systems (VCS) have been proved to be vulnerable to signal in- jections mimicking voice commands and explored security flaws in market avail- able products for the time of each respective study. Signal injection caused with the help of amplitude modulated ultrasonic waves (being known as DolphinAt- tacks - DA) were proved to work on several such devices in 2017. LÄS MER

  4. 3. Raspberry Pi Based IoT System for Bats Detection at Wind Farms

    Kandidat-uppsats, Blekinge Tekniska Högskola/Institutionen för matematik och naturvetenskap

    Författare :Hemanth Surya Karuturi; Megha Sanjeev Reddy Karri; [2020]
    Nyckelord :Bats; Pattern Recognition; Ultrasonic Frequencies; Ultrasonic Microphone; Ultrasonic Transducer; Wind Turbines;

    Sammanfattning : Context: Large numbers of bats are killed by collisions with wind turbines and there is at present no accepted method of reducing or preventing this mortality. We designed a system, which detects and records any bats’ activity in and around the surroundings of wind turbines. LÄS MER

  5. 4. Luftburen ultraljudsprovning och signalanalys

    Uppsats för yrkesexamina på grundnivå, Uppsala universitet/Institutionen för teknikvetenskaper

    Författare :Fredrik Dragsten; [2018]
    Nyckelord :ultraljud; signalanalys; testbädd;

    Sammanfattning : Equipment and machinery in industries may produce ultrasound when they are getting into failure conditions, for example, when bearings are worn or deteriorated, pipes have pressure leaks, electrical installations have electrical discharge. This project aims to develop a testbed using the airborne ultrasound testing to inspect and monitor the conditions of ball bearings. LÄS MER

  7. 5. Sound following robot

    Kandidat-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Karl Enoksson; Bohan Zhou; [2017]
    Nyckelord :;

    Sammanfattning : There are many different areas of use for sound localization. This concept is not only used to localize a person that is talking but can also be applied for finding a person in need One method of localizing the position of a sound source is to use several microphones to register the difference of time in which each microphone detects the same sound. LÄS MER