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B^K 180805 020

TYPE 4178

1/4 "サウンドインテンシティ・マイクロフォンペア、EXT.POLARIZED

音響インテンシティ・マイクロホンは、4 Hz～100 kHzの周波数範囲における高音圧・高周波数測定用に特別に設計されており、位相特性の広帯域マッチングが可能です。

TYPE 4178

TYPE 4178

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TYPE4178はTYPE4939 1/4インチマイクのペアで構成されており、その位相特性は100 Hzから20 kHzの間で整合されています

。
  • IEC61043クラス1に準拠した2マイク法による音響インテンシティ測定
  • 。
  • 音響強度プローブを使用した、ISO 9614-1、ISO 9614-2、ECMA 160、およびANSI S12.12に準拠したサウンドパワー測定
  • 。
  • 音源の粒子速度の測定
  • 。
Document タイプ 言語
Sound Intensity Microphone Pair - Type 4178 データシート English

Features

  • Broadband matching of phase responses
  • Phase calibrated in 1/3-octave frequency bands from 100 Hz – 20 kHz

Type 4939 microphones are specially designed for high-level and high-frequency measurements. By using stainless steel diaphragm and protection grid, the microphone is optimized to withstand rough environments and is capable of working at high temperatures – up to 150°C (302°F). The microphones are mainly used in Sound Intensity Probes for sound power and intensity measurements, and can also be used for particle velocity measurements.

Type 4178 is supplied with 6 mm and 12 mm spacers, along with calibration charts giving the individually measured free-field frequency response for each microphone and a Phase Response Comparison Calibration (100 Hz – 20 kHz).

Calibration

Phase calibration of 1/4-inch microphone pair Type 4178 is done at Brüel & Kjær by subjecting the two microphones to the same sound signal in a pressure coupler. This individual phase calibration can be used to derive the Pressure-Residual Intensity Index for the microphone pair.

Sound intensity measurement systems containing a sound intensity probe set can be conveniently calibrated using
Sound Intensity Calibrator Type 3541-A. This permits simultaneous sensitivity adjustment of both channels of the processor (in pressure, particle velocity, or intensity modes) and allows determination of the 20 Hz – 5 kHz Pressure-Residual Intensity Index of the probe and processor combinations.