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Overview of Sound Measurement and Related Products

Structure of a condenser microphone

Microphone

Microphone

Microphones are classified into three types based on their conversion method: electrodynamic, condenser, and piezoelectric. Electrodynamic microphones still have a strong demand, mainly in the music world, while piezoelectric microphones are primarily used as microphones 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 are extremely stable compared to other types. The structure of a condenser microphone is illustrated in the diagram.
There are two types of condenser microphones: bias type and back electret type. The difference lies in whether an external DC voltage is applied or whether a permanently electropolarized polymer film is used instead of applying a voltage. Generally, bias type microphones are more sensitive and stable.

For more details, please read our technical report, "On 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 a method of understanding sound as "the flow of energy passing through a unit area per unit time," and its unit of measurement is W/ m². Acoustic intensity microphone probes are designed to measure this flow of sound energy by incorporating multiple microphones, allowing for the capture of both sound intensity and the direction of the flow as vector quantities. Conventional microphones can measure sound pressure (unit: Pa), which represents the intensity of sound at a specific location (one point), but they cannot measure the direction of the flow.
Acoustic intensity microphones, due to the characteristics described above, are used for sound source detection and acoustic power measurement. Our acoustic intensity microphones include a uniaxial type (model MI-6410) with two sets of pressure-type microphones placed in close proximity in a straight line, and a 3D type (model MI-6420) with our unique structure in which four microphones are placed at each vertex of a regular tetrahedron.

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

  • The information provided is subject to change.

  • The displayed price is a reference price for Japan only.

If you are considering purchasing this product, please contact your nearest sales office or agent.

最終更新日:2011/09/26