Environmental microphones

Environmental microphones

The G.R.A.S. Environmental Microphones are equipped with four-pronged anti-bird spikes on top of the windscreen. This prevents birds from perching on top of the windscreen when the microphone unit is placed outdoors for long-term unattended noise surveillance. Birds perching on top of the windscreen can seriously disturb measurements or even overload the measurement equipment. Furthermore, bird excreta can distort the acoustic properties of the windscreen so that it no longer performs according to original specifications. Some smaller birds have actually been known to nest on top of the earlier three-pronged anti-bird spikes. Hence, the introduction of a fourth, centre prong.
  1. 41AL Environmental Microphone
    Freq range:3.15 to 12.5
    Dyn range: < 17 dB(A) to > 156 dB
    Sensitivity: 50 mV/Pa

    G.R.A.S. 41AL Environmental Microphone

    The G.R.A.S. 41AL Environmental Microphone is a precision microphone unit for outdoor measurements that can withstand continuous rain and operate over wide temperature ranges. It comes in four versions suited for community noise and airport noise with respectively 0º and 90º incidence.

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  2. 41AO Environmental Microphone System
    Dyn range: 14 dB(A) to 146 dB
    Sensitivity: 50 mV/Pa

    G.R.A.S. 41AO Environmental Microphone System

    The G.R.A.S.  41AO Environmental Microphone System is a precision microphone unit (IEC 61672) for monitoring the noise of overhead aircraft. It can withstand rain and operate over a wide range of temperatures over periods lasting from a few days to several weeks.

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  3. 41AL-S4 CCP Environmental Microphone, Comm. Noise
    Freq range: TBD
    Dyn range: TBD
    Sensitivity: TBD

    G.R.A.S. 41AL-S4 CCP Environmental Microphone, Community Noise

    The G.R.A.S. 41AL-S4 CCP Environmental Microphone, Comm. Noise is a precision microphone unit for outdoor measurements that can withstand continuous rain and operate over wide temperature ranges. It comes in four versions suited for community noise and airport noise with respectively 0º and 90º incidence.

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