Eta450 Ultra

Optical Microphone

The Eta450 Ultra membrane-free optical microphone is XARION’s most sensitive device. It is designed for contact-free ultrasound material testing. The frequency bandwidth expands from 50 kHz to 2 MHz making the sensor the perfect match for broadband, laser-ultrasound excitation. This small-sized and contact-free testing setup is particularly suitable for the characterization of composite materials, weld spots and adhesive joints.


    • Membrane-free optical microphone
    • Frequency range 50 kHz–2 MHz
    • Self-noise: 5 µPa (BW: 1 Hz, measured @ 500 kHz)
    • Max. sound pressure for THD < 3%: 40 Pa
    • Dynamic range: 30-130 dB SPL @ 50 kHz-2 MHz