Smart features, ultra-thin designs, and built-in DSP shape the future of vehicle testing
In Part 1, we looked at the transition toward 1/4” microphones, low-noise models for EVs, and rugged sensors built for harsh testing conditions. In this second part, we focus on cutting-edge features that enhance efficiency, reduce setup complexity, and support advanced automotive applications like CFD validation and in-cabin audio optimization.
Smart Microphones with Built-In Self-Verification
As test setups become increasingly complex—particularly in multi-channel automotive test cells—quickly verifying system integrity without physical access becomes essential. SysCheck2-enabled microphones, such as the GRAS 246AE, offer a smart and effective solution.
Each microphone includes a built-in microcontroller and oscillator to perform automatic sensitivity checks across all channels. These self-verifications complete in seconds and require no physical interaction. An LED status indicator provides immediate feedback: green for pass, red for detected issues.
By reducing manual verification time and ensuring reliability, these intelligent microphones help engineers streamline workflows and focus on analysis rather than troubleshooting.
Figure 1: Measurement microphone with GRAS’ Syscheck2 self-verification technology.
Ultra-Thin Microphones for Aeroacoustics and CFD Validation
In airflow measurements—like wind tunnel testing or cavity resonance studies—microphone size can significantly impact data accuracy. That’s why ultra-thin precision (UTP) microphones, such as the GRAS 48LA and 48LX-1, are gaining traction.
At just 1 mm thick, these are currently the thinnest measurement microphones available. Their minimal profile allows them to be used in narrow cavities or flush-mounted in aerodynamic surfaces, making them ideal for:
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Validating computational fluid dynamics (CFD) simulations
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Capturing boundary layer turbulence
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Measuring resonance in tight enclosures
This shift toward minimal impact microphones helps ensure that the presence of the sensor doesn’t interfere with the measurement itself.
Figure 2: (a) GRAS UTP microphone with mounting fairing. (b) UTP dimensions in millimeters.
Figure 3: (a) UTP microphones can help validate computer fluid dynamics simulations with wind tunnel testing. (b) UTP microphones can be placed in small cavities to measure cavity resonance.
Built-In Digital Signal Processing for Consistency and Efficiency
As auto and audio manufacturers increasingly use digital signal processing (DSP) to enhance in-vehicle sound systems with features such as in-cabin ANC, measurement microphone manufacturers are innovating to keep up. An example of this is GRAS EQset technology (Figure 4). Microphones with EQset use built-in DSP to equalize the frequency response of the microphone. This way, all microphones are born with the same sensitivity and flat frequency response, virtually eliminating the need for acoustical calibration.
Figure 4: Microphones with EQset technology with built-in digital signal processing for adjusting the microphone’s sensitivity and equalizing the frequency response flat.
Engineering-Grade Performance, Ready for Tomorrow’s Challenges
Whether you're validating in-cabin acoustics, running aeroacoustic simulations, or optimizing audio system integration, the right microphone makes all the difference. The latest trends show a clear move toward precision, automation, durability, and digital readiness.
Explore how GRAS acoustic solutions can support your next innovative project:
