Type 4961

Manufactured by Brüel & Kjær

The Type 4961 is a half-inch pressure microphone from Brüel & Kjær. It is designed for sound pressure level measurements in various applications.

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Lab products found in correlation

3160 a 022 module, by Brüel & Kjær (2 mentions) Dg1022, by Rigol (1 mentions)

6 protocols using type 4961

Acoustic Meta-Neural Network Simulation

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Our acoustic meta-neural network was simulated using MATLAB and trained in a desktop with a GeForce RTX 2070 Graphical Processing Unit(GPU), Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40 GHz and 160 GB of RAM, running Windows 7 operating system(Microsoft).
In the experiment, the input sound was generated by a speaker (Beyma CP380), driven by the waveform generator (RIGOL DG1022). The sensor we used on the detection plane was 1/4-inch free field microphone (BRÜEL & KJÆR Type 4961) and the stand-alone recorder (BRÜEL & KJÆR Type 3160-A-022). The experiments are carried out in anechoic room.

Weng J., Ding Y., Hu C., Zhu X.F., Liang B., Yang J, & Cheng J. (2020). Meta-neural-network for real-time and passive deep-learning-based object recognition. Nature Communications, 11, 6309.

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Anechoic Chamber Acoustic Measurements

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The measurement is performed in the anechoic chamber in order to eliminate the undesired reflected waves. A 1/4-inch microphone (Brüel&Kjær type-4961) is used for measuring the sound field in the scanned region. A loud speaker is placed 2 m away from the pipe to obtain a plane wave incidence, emitting sound wave of frequency from 4200 Hz to 4500 Hz with a step of 10 Hz. Sound absorbing foams are also set at the exit of experimental insulator.

Zhang H.L., Zhu Y.F., Liang B., Yang J., Yang J, & Cheng J.C. (2017). Sound Insulation in a Hollow Pipe with Subwavelength Thickness. Scientific Reports, 7, 44106.

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Stereolithographic 3D Printed Acoustic Dispersion

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The experimental sample was fabricated with photosensitive resin via stereolithographic 3D printing. For the dispersion measurements in Fig. 2, a broadband sound signal is launched from a balanced armature speaker with a radius of 1 mm, driven by a power amplifier, and located near the core of vortex strings at the top or bottom layer of the sample. Each probe is a microphone (Brüel & Kjær Type 4961) in a sealed sleeve with a tube with a radius of 1 mm and a length of 250 mm. The probes can be threaded into the sample along the horizontal air regions to scan different positions within each layer of the sample. The measured data was processed by a Brüel & Kjær 3160-A-022 module to extract the frequency spectrum with a resolution of 2 Hz. The spatial Fourier transform was applied to complex acoustic pressure signals to obtain the dispersion relation and field distributions.

Ma J., Jia D., Zhang L., Guan Y.J., Ge Y., Sun H.X., Yuan S.Q., Chen H., Yang Y, & Zhang X. (2024). Observation of vortex-string chiral modes in metamaterials. Nature Communications, 15, 2332.

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Acoustic Characterization of Twisted Structures

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All samples are fabricated using the additive manufacturing technique. The material is a photosensitive resin with a density of 1.10 g cm⁻³ and a modulus of 2880 MPa. The acoustic signals are recorded with the Brüel & Kjær 3160-A-022 module and analyzed with a commercial software PULSE. In the measurement of the triple-layer twisted structure, the sound signal is launched by a balanced armature speaker (radius of 1 mm) that is driven by a power amplifier. The sound is then guided to the sample center via a narrow tube (radius of 1.5 mm and length of 200 mm). The probe and reference microphones (radius of 3.2 mm; Brüel & Kjær Type 4961) are separately placed in a sealed sleeve with a long tube (radius of 1 mm and length of 100 mm). The tube connecting to a probe microphone is inserted into the sample to detect the acoustic wave at the Moiré pattern interface point by point. The position of the reference microphone is fixed around the sound source to detect the reference signal. The scanning region takes up an area of about 400 mm by 400 mm, and the resolution is around 7.07 mm by 7.07 mm. The experimental setup of the bilayer twisted structure is similar to that of the triple-layer structure, except that the acoustic signal is guided to the sample via a rectangular waveguide with a width of 10 cm and a height of 1 cm. The measured planes are marked in Figs. 3B and 4 (A and B).

Yang Y., Ge Y., Li R., Lin X., Jia D., Guan Y.J., Yuan S.Q., Sun H.X., Chong Y, & Zhang B. (2021). Demonstration of negative refraction induced by synthetic gauge fields. Science Advances, 7(50), eabj2062.

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Measurement of Acoustic Pressure Profiles

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In the LL experiment, a broadband sound signal (4–8 kHz) is launched from a narrow long tube in Fig. 4c (diameter of about 0.3 cm and length of 35 cm) that is inserted into the centermost site, which acts as a point-like sound source for the wavelength focused here. The pressure of each site is detected by a microphone (Brüel&Kjær Type 4961) adhered to a long tube (diameter of about 0.2 cm and length of 35 cm). The signal is recorded and frequency-resolved by a multi-analyzer system (Brüel&Kjær 3160-A-022 module). In the drumhead state experiment, the source is located at the 2nd (12th) layer when we measure the bottom (top) drumhead state (Supplementary Information Fig. S10). Other sets are the same as before.

Cheng Z., Guan Y.J., Xue H., Ge Y., Jia D., Long Y., Yuan S.Q., Sun H.X., Chong Y, & Zhang B. (2024). Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal. Nature Communications, 15, 2174.

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3D Printed Acoustic Logic Gates

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The designed acoustic logic gates are fabricated with epoxy resin by three-dimensional printing technology. To obtain the same input signals, two same cylindrical acoustic sources are placed on the right side of the input ports, and the distance between the unit cell and the cylindrical source is 5 mm. The input signals are generated from the cylindrical sources driven by a power amplifier. On the left side of the output port, a 1/4 inch microphone (Brüel & Kjær type-4961) is adopted to measure output signals. The measured data is recorded by the Brüel&Kjær 3160-A-022 module, and is analyzed by the software PULSE Labshop.

Wang Y., Xia J.P., Sun H.X., Yuan S.Q, & Liu X.J. (2019). Binary-phase acoustic passive logic gates. Scientific Reports, 9, 8355.

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