We are looking into starting a noise sensor project in Iceland. Our idea is still in the general conceptualization phase.
One of the problems we can currently identify is the calibration of the microphone. A noise engineer working on our team is worried about the detoriation of the quality of the data with time. Has this been addressed elsewhere here?
We would like to use the IM72D128 due to the waterproofing of the microphone.
Hi,
Please check:
Maybe you can contact Helmut Bitter.
Thanks for the response, @pjg. I followed your recommendation and got in touch with Helmut Bitter directly. He provided a lot of useful insight that helped clarify our concerns.
The specific microphone we’re considering, the IM72D128, has indeed been tested with calibrators, and results so far indicate that measurement accuracy does not significantly deteriorate over time under typical conditions. That’s reassuring.
Additionally, Firmware version 5 for Teensy 4.0, available on Helmut’s GitHub page, includes a method to offset the sensor’s measurements. While it doesn’t support non-linear calibration adjustments, this basic offsetting can help correct for minor drifts.
If more serious degradation occurs in the long term, replacing the sensor element itself might be the most practical and cost-effective solution, as the components are relatively cheap.
Thanks again for the pointer. I hope this summary is helpful to others considering a similar setup.
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