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Array Microphone Solutions

Array Microphone MI19

IEPE Microphone
Class 1
in accordance with IEC 61672
Transducer type
Electrete pressure transducer
Diameter
1/4″
Polar pattern
Omni
Frequency range
20 Hz – 30 kHz
Sensitivity @ 1 kHz
50 mV/Pa ± 0.5 dB
Max. SPL for
1% THD at 1 kHz
130 dB Peak
Inherent noise
30 dB(A)
Output impedance
<50 Ohm
Current consumption
2-6 mA
Power supply
18 V DC to 30 V DC
Bias:
12.5 Volt
Temperature range, operation
-20°C to +80°C
Heat resistant
up to 110 °C
Diameter
7 mm ± 0.05 mm
Length
83 mm
1/4″ sleeve diameter over the entire length
Weight
19 g
Connector
BNC (fem.)

Hemisphere Microphone Array

Sound power measurement with MF710 / MF720. They are hemispherical arrays developed by BSWA for sound power measurement.

MF710 meets the requirements of the 10-microphone method according to GB 6882 1986, ISO 3745:1977, GB/T 18313 2001 and ISO 7779:2010.

MF720 meets the requirements of the 20-microphone method according to GB/T 6882-2008 and ISO 3745:2012.

The MF710 / MF720 was developed as a small, lightweight and easy-to-mount bracket.

Microphones can be mounted on the hemispherical surface very quickly and accurately, making it very easy to comply with the standard requirements for sound power measurement.

MF710

Sound Power Measurement

Description:

Meets the requirements of GB/T 6882, ISO 3745, GB/T 18313, ISO 7779

The mic can be moved along the rail to meet 10 and 20 mic method

Different types of microphones with 1/2 inch preamp can be mounted

It can be fixed to the floor or hung

Easy to take on, light and compact, supplied with a professional carrying case

Suitable for sound power measurement in the laboratory and outdoors

Model
Description
Qty
Price
MF720

Microphone holder for sound power measurement Radius 1m
meet the requirement of 20 microphone method according to
GB/T 6882-2016、ISO 3745:2012.

1
8300 €
MF710

Microphone holder for sound power measurement Radius 1m
Meet the requirement of 10 microphone method according to
GB 6882-1986, ISO 3745:1977, GB/T 18313-2001 and ISO 7779:2010.

1
6800 €

The acoustic array measurement system, commonly known as the acoustic camera, is composed of multiple microphones arranged according to a certain rule, and the sound pressure level distribution on a plane or spherical surface is generated by the array signal processing algorithm (such as beam-forming, acoustic holography). 

The sound visualization is realized by means of graphs, and the noise source distribution of the measured object is displayed by means of photos or videos.

Acoustic array system is widely used in noise source location, wind tunnel noise testing and machine condition monitoring. 

Acoustic array systems usually require dozens, or even hundreds of microphones. 

BSWA provides high-performance, economical array microphones for the research and development of acoustic array systems. 

Let’s talk about how to choose the right microphone for your array.

Microphone Array

Key points for choosing the array microphone

1, Dynamic Range

ROGA has three array microphones, RG-50, MPA416, MPA436A and MPA456, which cover the measurement range from 29dBA to 151dB. However, the sound pressure measurement range of each model is different, customers will need to choose the appropriate model according to the applications. 

For example, RG-50 & MPA416 is suitable for conventional acoustic array testing. 

MPA436A is suitable for high dynamic range acoustic testing, MPA456 is an array microphone designed for high sound pressure and acoustic wind tunnel.

RG-50 Frequency Response

RG-50 Infranoise to Ultranoise Microphone

2, Frequency Response

 

The MI17, MPA416 and MPA436A have the frequency range from 20 Hz to 20 kHz.

They are suitable for the most applications in noise measurements. The MPA456 has good performance in high frequencies up to 32 kHz. 

It is suitable for conditioning monitoring using acoustic array technologies.

3, Phase matching

The phase difference between the microphones are required to be small enough to ensure the accuracy of measurements. 

Regardless of the algorithm or the array shape, all calculations and delays are based on the premise that the microphone time differences are highly consistent. 

That is, the phases are highly consistent. 

ROGA array microphones are strictly phase matched before ex-factory inspection, and the phase difference of a batch of microphones is controlled within ±5 degrees up to 5000 Hz.