Everything About Coherence Scanning Holography
This whitepaper describes a new method for visualizing sound sources using a rotating array of digital microphones, focusing on automotive leakage detection.
It covers hardware, signal processing, and applications in quality control.
The main topics covered include:
- Introduction: Overview of the challenges in localizing sound sources with moving microphones, particularly in automotive contexts.
- State of the Art: Examination of existing technologies and the limitations of current sound imaging methods.
- Sensor Concept: Detailed description of the hardware, including the rotating linear microphone array and its properties.
- Acoustic Image Computation: Explanation of the algorithms used to process the acoustic signals and generate spatial heatmaps.
- Signal Properties: Analysis of the characteristics of signals acquired by moving microphones, including Doppler effect compensation.
- Applications: Practical applications in automotive leakage detection, highlighting the setup, measurement process, and real-world results.