Eta450 Ultra

Ultrasound sensor for non-destructive testing

The membrane-free Eta450 Ultra Optical Microphone is designed as a contact-free ultrasound sensor for non-destructive testing (NDT) of various materials. With a frequency bandwidth spanning from 50 kHz to 2 MHz, this sensor is a perfect match for use with broadband laser-ultrasound excitation. Its compact size and non-contact nature make it exceptionally well-suited for ultrasonic testing of composite materials, spot welds, 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: 100 dB