Impedance tube, Kundt’s tube, sound absorption and transmission loss

PLACID Instruments

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    Impedance tube, Kundt’s tube, sound absorption and transmission loss

    The impedance tube (also know as Kundt Tube) measurement obtains the normal incidence absorption coefficient of a layer of textiles with a small diameter (usually less than 10 cm).

    The results can be used to compare the basic absorption performance of the material and for acoustics simulations.

    In practice, the absorbers can be quite large and their structure and configuration may be complex and part of acoustic designs. Furthermore, they will be exposed to real sound fields where the incident sound may come from many directions.

    The PLACID impedance tube kit consists of 2 tubes with a diameter of 30 and 100 mm to cover the whole frequency range. At the end of the tube, a loudspeaker is mounted and will emit a precisely quantified sound generated by the signal generator and amplified by the amplifier.

    The microphones will measure the sound level at each given position. The software will then calculate the normal incident acoustic properties of the material based on the frequency response functions measured between the various measurement locations.

    The Impedance tube kit can determine the sound absorption coefficient as well as the transmission loss.

    PI8810, 100 mm impedance tube, frequency range 63 Hz – 1600 Hz

    PI8803, 30 mm impedance tube, frequency range 800 – 6300 Hz

    Impedance tube can measure sound absorption coefficient as well as transmission loss, ISO10543-2, ASTM E1050-08.

    .Microphones used: 1/4″ Class 1, 20 Hz to 20 kHz (BNC to SMB connector)

    Applications for Impedance Tube

    • testing of material characteristics and verifying material compliance before implementing the materials in the assemblies
    • design of acoustic comfort in aircraft, helicopters, ships, yachts and vehicle interiors by selecting the optimal acoustic treatments and noise barriers
    • research and development of noise control products by benchmarking competitive products
    • research jobs for students and universities
    • validating and calibrating theoretical computational methods such as acoustic modelling

    Define material Characteristics

    Materials in acoustic application typically either are used for sound absorption or for noise transmission loss. Acoustic designers need to know the exact noise characteristics of a material to be able to make predictions. Testing a material in the Impedance Tube is quick and precise.

    Download PLACID Impedance tube datasheet

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    PLACID PMP20 Microphone

    PLACID PMP20 Microphone

    The PLACID PMP20 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 1 microphone.

    The PMP20 microphone is optimized for free-field measurements.
    As all PLACID microphones, the PMP20 comes with an individually calibration certificate.

     

    Download PLACID PMP20 Microphone Datasheet

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    PLACID PMP21 Microphone

    PLACID PMP21 Microphone

    The PLACID PMP21 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 1 microphone.

    The PMP21 microphone is optimized for free-field measurements.
    As all PLACID microphones, the PMP21 comes with an individually calibration certificate.

     

    Download PLACID PMP21 Microphone Datasheet

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    PLACID PMP27 Microphone

    PLACID PMP27 Microphone

    The PLACID PMP27 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 1 microphone.

    The PMP27 microphone is optimized for pressure-field measurements.
    As all PLACID microphones, the PMP27 comes with an individually calibration certificate.

     

    Download PLACID PMP27 Microphone Datasheet

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    PLACID PMP40 Microphone

    PLACID PMP40 Microphone

    The PLACID PMP40 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 2 microphone.

    The PMP40 microphone is optimized for free-field measurements.
    As all PLACID microphones, the PMP40 comes with an individually calibration certificate.

     

    Download PLACID PMP40 Microphone Datasheet

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    PLACID PMP41 Microphone

    PLACID PMP41 Microphone

    The PLACID PMP41 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 1 microphone.

    The PMP41 microphone is optimized for free-field measurements.
    As all PLACID microphones, the PMP41 comes with an individually calibration certificate.

     

    Download PLACID PMP41 Microphone Datasheet

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    PLACID PMP42 Microphone

    PLACID PMP42 Microphone

    The PLACID PMP42 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 2 microphone.

    The PMP42 microphone is optimized for free-field measurements.
    As all PLACID microphones, the PMP42 comes with an individually calibration certificate.

     

    Download PLACID PMP42 Microphone Datasheet

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    PLACID PMP47 Microphone

    The PLACID PMP47 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 1 microphone.

    The PMP47 microphone is optimized for pressure-field measurements.
    As all PLACID microphones, the PMP47 comes with an individually calibration certificate.

     

    Download PLACID PMP47 Microphone Datasheet

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    PLACID PMV21 Microphone

    PLACID PMV21 Microphone

    The PLACID PMV21 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 1 microphone.

    The PMV21 microphone is optimized for free-field measurements.
    As all PLACID microphones, the PMV21 comes with an individually calibration certificate.

     

    Download PLACID PMV21 Microphone Datasheet

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    PLACID PMV27 Microphone

    PLACID PMV27 Microphone

    The PLACID PMV27 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 1 microphone.

    The PMV27 microphone is optimized for Pressure-field measurements.
    As all PLACID microphones, the PMV27 comes with an individually calibration certificate.

     

    Download PLACID PMV27 Microphone Datasheet

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    PLACID PNP21 Preamplifier

    PLACID PNP21 Preamplifier

    The PLACID PNP21 1⁄2” Preamplifier is a robust preamplifier designed to be used for acoustic measurements with condenser microphones.

    The self-noise is very low, it has a wide dynamic range and frequency response.

    • Frequency range: 5.0 Hz to 100 kHz
    • Noise: <2.0 μV
    • Usage: General purpose

     

    Download PLACID PNP21 Preamplifier Datasheet

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    PLACID PNP22 Preamplifier

    PLACID PNP22 Preamplifier

    The PLACID PNP22 1⁄2” Preamplifier is a robust preamplifier designed to be used for acoustic measurements with condenser microphones.

    The self-noise is very low, it has a wide dynamic range and frequency response.

    • Frequency range: 5.0 Hz to 100 kHz
    • Noise: <2.0 μV
    • Usage: General purpose

     

    Download PLACID PNP22 Preamplifier Datasheet

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