Vision
Laser-acoustic testing method for production lines
The optical microphone from Xarion Laser Acoustics was combined with an ultrasound-generating laser, making it possible to detect defects in components that cannot be seen from the outside, such as cracks, holes or poor connections.
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Bild / Image: Xarion
The optical microphone does not have an oscillator. In its purely optical process, the sound changes the wavelength of a laser beam, which is reflected back and forth between two small mirrors.
This also changes the brightness of the decoupled light, which is measured without the detour via a mechanical vibration. In this way, the optical microphone achieves a detectable frequency interval that is at least twenty times larger than that of a conventional ultrasonic sensor. In addition, contact with the examinee can be dispensed with.
