Journal: Journal of occupational and environmental hygiene

Article Title: An inexpensive sensor for noise

doi: 10.1080/15459624.2018.1438614

Figure Lengend Snippet: The inexpensive noise sensor. A simplified circuit diagram (top panel) shows that the electrical signal from the microphone is amplified twice before reaching the sensor microcontroller (Teensy). The actual components of noise sensor incorporated into multi-hazard monitor are shown in the bottom panel. An electret microphone extends from the exterior of the grey enclosure and the sensor microcontroller is shown inside the enclosure. On the red circuit board, a monitor microcontroller communicates with the noise and other hazard sensors and with a database via WiFi.

Article Snippet: A 20 Hz to 20 kHz omnidirectional analog electret condenser microphone ( CMA-4544PF-W, CUI Inc., Tualatin, OR, USA), housed at the end of a plastic tube, projects from the exterior of the monitor enclosure.

Techniques: Amplification

Journal: Science Advances

Article Title: Broadband acoustic invisibility and illusions

doi: 10.1126/sciadv.abi9627

Figure Lengend Snippet: A schematic and photograph are shown in ( A ) and ( B ), respectively. Two circular arrays with each 114 microphones record the pressure fields ( C ). Using the recordings, an FPGA-based low-latency control system ( D ) performs the real-time wavefield extrapolation to predict the input signals for the control loudspeakers ( E and F ). Photo credit: Theodor S. Becker, ETH Zürich.

Article Snippet: Instead of directly measuring the normal particle velocity and pressure on S rec , as dictated by the theory of the underlying control algorithm (see Supplementary Materials for details), we use two circular arrays of pressure microphones with radii of 35.3 and 37.3 cm, respectively, each consisting of 114 electret condenser microphones (SparkFun Electronics, BOB-12758 and COM-08635; ).

Techniques: Control

Journal: Sensors (Basel, Switzerland)

Article Title: Development of an Ultrasonic Doppler Sensor-Based Swallowing Monitoring and Assessment System

doi: 10.3390/s20164529

Figure Lengend Snippet: Comparison of swallowing duration results of healthy participants

Article Snippet: Next, an omnidirectional electret condenser microphone (WM-54BH, Panasonic Corporation, Japan; frequency = 20~16,000 Hz, radius = 9.7 mm, sensitivity = −42 ± 2 dB, and signal to noise ratio >60 dB) and an IMU (MPU-6500, TDK Corporation, Japan; 6-axis gyro accelerometer, L × W × T = 3 mm × 3 mm × 0.9 mm) are used to record signals due to vocalization, coughing, and/or movements around the neck, which also can affect ultrasound signals.

Techniques: Comparison

Journal: Sensors (Basel, Switzerland)

Article Title: Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers

doi: 10.3390/s23010195

Figure Lengend Snippet: Model parameters for CMA-4544PF-W electret condenser microphone.

Article Snippet: Microphone , To measure the sound of the IVT. The selected microphone was an omnidirectional electret condenser microphone from CUI Inc. with a −44 dB sensitivity, an operating frequency in the range (0.02, 20) kHz..

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers

doi: 10.3390/s23010195

Figure Lengend Snippet: Circuit model of CMA-4544PF-W electret condenser microphone with pre-amplifying stage built in around the low-noise OA MAX4466.

Article Snippet: Microphone , To measure the sound of the IVT. The selected microphone was an omnidirectional electret condenser microphone from CUI Inc. with a −44 dB sensitivity, an operating frequency in the range (0.02, 20) kHz..

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers

doi: 10.3390/s23010195

Figure Lengend Snippet: Frequency response of the CMA-4544PF-W electret condenser microphone with pre-amplifying stage built-in around the low-noise OA MAX4466.

Article Snippet: Microphone , To measure the sound of the IVT. The selected microphone was an omnidirectional electret condenser microphone from CUI Inc. with a −44 dB sensitivity, an operating frequency in the range (0.02, 20) kHz..

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers

doi: 10.3390/s23010195

Figure Lengend Snippet: List of main elements of the system.

Article Snippet: Microphone , To measure the sound of the IVT. The selected microphone was an omnidirectional electret condenser microphone from CUI Inc. with a −44 dB sensitivity, an operating frequency in the range (0.02, 20) kHz..

Techniques: Isolation

Journal: Sensors (Basel, Switzerland)

Article Title: Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers

doi: 10.3390/s23010195

Figure Lengend Snippet: Comparison tests carried out.

Article Snippet: Microphone , To measure the sound of the IVT. The selected microphone was an omnidirectional electret condenser microphone from CUI Inc. with a −44 dB sensitivity, an operating frequency in the range (0.02, 20) kHz..

Techniques: Comparison

Journal: Sensors (Basel, Switzerland)

Article Title: Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers

doi: 10.3390/s23010195

Figure Lengend Snippet: Advantages and disadvantages of existing ferroresonance-detection methods.

Article Snippet: Microphone , To measure the sound of the IVT. The selected microphone was an omnidirectional electret condenser microphone from CUI Inc. with a −44 dB sensitivity, an operating frequency in the range (0.02, 20) kHz..

Techniques: Isolation