3D imager for acoustic waves
Today, there are many solutions for mapping sound waves. However, to what extent can we visualise a wave without using an invasive and costly sensor network?
The technological solution developed consists of an acousto-optic sensor enabling three-dimensional mapping of acoustic pressure. It goes beyond conventional solutions by combining interaction-free measurement and low sensor cost.
Competitive advantages
- Non-intrusive measurement
- Low sensor cost
- Compact system
- Image resolution
Applications
Acoustic characterisation market:
- Automotive
- Motor manufacturer
- Loudspeaker manufacture
- Domestic appliances
- Construction industry
Intellectual property
- Patent
Development stage
Experimental proof of concept
Laboratory
LAAS
Description
The technological solution developed consists of an optical method to visualise sound. The interferometric sensor, laser and target are moved simultaneously around a common axis. The interferometric sensor is combined with conventional tomography reconstruction methods.
The key points of the method are:
- Imaging system for mapping acoustic pressure waves
- Use of an interferometric sensor mounted on a motorised arm
- Image reconstruction processing using conventional tomography methods
Technical specifications
- Measurable frequency range: From 50 Hz to 300 kHz
- Measurement method: Interferometry
- Displacement resolution: As a function of frequency and laser beam size
- Acquisition speed: A few milliseconds/point
- Sensor life: 100,000 hours