Eta250 Ultra

Optical Microphone

XARION's Eta250 Ultra membrane-free optical microphone is able to listen to the entire acoustic frequency bandwidth that can be physically transmitted through air. The patented sensor technology will cover a range from 10 Hz to 1MHz with a single sensor head. It was specially designed for applications with low self-noise requirements.


  • Membrane-free optical microphone
  • Low self-noise level
  • Frequency range: 10 Hz–1 MHz (acoustics and ultrasound)
  • Dynamic range: 50–150 dB (A) SPL