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Overview of Sound Measurement and Related Products

Structure of a condenser microphone.

Microphone

Microphone

Microphones are classified into dynamic, condenser, and piezoelectric types due to differences in their conversion methods. Dynamic microphones have a strong demand primarily in the music world, while piezoelectric microphones are mainly used for low-frequency sound level meters. For measurement purposes, condenser microphones are generally used because they can be made small, have a flat frequency response over a wide frequency range, and exhibit extremely high stability compared to other types. The structure of a condenser microphone is illustrated.
Additionally, there are two types of condenser microphones: bias type and back electret type, with the difference being whether a direct current voltage is applied from an external source or a permanently polarized polymer film is used instead of applying voltage. Generally, the bias type is characterized by being more sensitive and stable.

For more details, please read the technical report "About Sound and Its Sensors."

　
About sound and its sensors

Regarding the operating principle of sound intensity probe

Sound intensity probe

  • MI-6410
    MI-6410
  • MI-6420
    MI-6420

Acoustic intensity is defined as the "flow of energy passing through a unit area per unit time," with the measurement unit being W/m 2. The acoustic intensity microphone probe is designed to measure this flow of sound energy by incorporating multiple microphones, allowing it to capture the direction of the flow as a vector quantity along with the sound intensity. While a standard microphone can measure sound pressure (unit: Pa) representing the sound intensity at a specific location (a single point), it cannot measure the direction of the flow.
Due to the characteristics mentioned above, the acoustic intensity microphone is used for sound source exploration and acoustic power measurement. Our company offers a uniaxial type (model MI-6410) with two pairs of pressure-type microphones arranged closely in a straight line, and a unique three-dimensional type (model MI-6420) with four microphones positioned at each vertex of a regular tetrahedron.

For more details, please read our technical report "About Sound and Its Sensors."

  • The described items may be subject to change.

  • The displayed price is listed as a reference for domestic prices in Japan.

If you are considering a purchase, please check with the nearest our sales office or agent.

最終更新日:2011/09/26