Detection, Localization, and Visualization of Abnormal Noise Sources for Fault Diagnosis

Technology Overview

This technology offer is a real-time "sound camera" that enables the user to pinpoint and visualize noise sources for fault detection. Highly sensitive MEMS microphone arrays detect and locate highly transient noise sources, using field programmable gate array (FPGA)-based high speed beamforming technology. The device also performs superbly on stationary noise sources. An integrated camera capable of capturing 25 images per second captures the scene, and overlays an indication of the sound source in the captured images. In this way, the user is able to locate and visualize the sound source easily. The major application of this device is for the detection of Buzz, Squeak, and Rattle (BSR) noise sources, as well as the visualization of Noise, Vibration, and Harshness (NVH) sources.

Technology Features & Specifications

1. Ultrasonic

  • Detection Range: 20-60 kHz
  • Operation Time: 2.5hours
  • Temperature: -20~50 degC (-4~122 degF)
  • Detection Distance 20 m (65ft)
  • Size: 306 x 150 x 154 mm (12.0 x 5.9 x 6.0 in)
  • Weight: 2.2 kg


2. Portable Mini Sound Camera


  • Unique, Innovative Design
  • 96ch Digital MEMS Microphones
  • High Resolution Optical Camera
  • High Speed Processing based on FPGA
  • Easy Connection based on Wireless Network


  • Real-Time Sound Imaging
  • High Speed Image Update, 25 FPS
  • Optimized for BSR Detection
  • Background Noise Removal (Noise Gate)
  • Selective Listening for Noise Source
  • Effective Post Processing
  • FFT and Octave Analysis
  • Mobile function through Web Service

Potential Applications

Leak Arc Detection and Monitoring Solution

Visualizing Ultrasound: As highly pressurized gas passes through a small crack in a pipe, the vibration generates ultrasonic waves. The MEMS microphone arrays of this device can analyze the intensity and sequence of the received signals to locate the sound source.

Optimized Detection Range: Through numerous tests, the frequency detection range has been optimized. For example, the sound from gas leaks is maximized while surrounding noises are at a minimum. As a result, accurate location of gas leaks in an outdoor environment can also be achieved.

Market Trends and Opportunities

This portable sound camera has applications in: BSR Noise Detection/Noise Leakage Detection/Noise Evaluation and Quality Improvement. Implementing this technology solution in factories and industrial plants can enable the end user to detect abnormal noises easily, and at an early stage of potential equipment failure. The early detection of these abnormal noises can help to prevent downstream catastrophic failures. 

Customer Benefits

  • Easy to use: Intuitive visual output that anyone can understand without training
  • Quick diagnose : Detects a wider angle and locates multiple sound sources at the same time
  • Easy to share: Result is presented visually, can be easily saved and shared as videos/images
  • Effective preventive maintenance: Detecting equipment anomalies from abnormal noises before catastrophic failures occur means that accidents can be prevented from the onset of early equipment failure. Cost savings is a benefit from early repairs. 

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