Surface microphones
The GRAS surface microphones are specifically designed for in-situ boundary layer testing, where non-intrusive mounting is essential. This eliminates the need to drill holes at the mounting location. Their low-profile design minimizes height, and they can be installed with a surrounding fairing to reduce self-generated turbulence. Equipped with an integrated preamplifier, they offer true plug-and-play functionality.
The 40PS-1 model features a cost-effective microphone capsule and is 2.8 mm thick. The 40LA and 40LS models use high-precision microphone capsules, with a reduced thickness of 2.5 mm. The 48LA and 48LX Ultra-Thin-Precision (UTP) microphones leverage cutting-edge manufacturing techniques, enabling a high-quality condenser microphone to fit into an ultra-slim 1 mm housing, while ensuring the solution remains cost-effective.
GRAS surface microphones are engineered for quick, easy mounting and rapid in-situ verification. They are ideally suited for boundary layer measurements, aeroacoustic testing, and applications involving small cavity measurements.
GRAS surface microphones are among the range of special microphones that furthermore includes
Freq range: 5 Hz to 70 kHz
Dyn range: 56 dB(A) to 178 dB
Sensitivity: 0.5 mV/Pa
GRAS 40LA 1/4" CCP Precision Surface Microphone, High Pressure
The GRAS 40LA High-Precision Surface Microphone is a high-precision microphone for measurements on planar and curved surfaces. It has a wide useful frequency range reaching up to 70 kHz and a large dynamic range topping at around 178 dB.
Freq range: 5 Hz to 70 kHz
Dyn range: 46 dB(A) to 167 dB
Sensitivity: 1.8 mV/Pa
GRAS 40LS 1/4" CCP Precision Surface Microphone
The GRAS 40LS High-Precision Surface Microphone is a high-precision microphone for measurements on planar and curved surfaces. It has a wide useful frequency range reaching up to 70 kHz and a large dynamic range topping at around 167 dB.
Freq range: 10 Hz to 12 kHz
Dyn range: 27 dB(A) to 145 dB
Sensitivity: 15 mV/Pa
GRAS 40PS-1 CCP Surface Microphone
The GRAS Surface Microphone 40PS-1 is a low-profile, light surface microphone for general purpose measurements on planar and curved surfaces exposed to slipstreams.
Freq range: 20 Hz to 20 kHz (±1 dB)
16 Hz to 31.5 kHz (±3 dB)
Dyn range: 64 dB(A) to 184 dB
Sensitivity: 0.12 mV/Pa (±2 dB)
Use: For aeroacoustic measurements
GRAS 48LA UTP Microphone, High Pressure
48LA is an Ultra-thin Precision (UTP) surface microphone for aeroacoustic testing. It is a low-profile ¼″ CCP high-pressure condenser microphone. The microphone is only 1 mm high and can, therefore, be mounted in air flow without disturbing the sound field.
Freq range: 20 Hz to 31.5 kHz (±1 dB)
10 Hz to 50 kHz (±3 dB)
Dyn range: 54 dB(A) to 170 dB
Sensitivity: 0.6 mV/Pa (±3 dB)
Use: For aeroacoustic measurements
GRAS 48LX-1 UTP Microphone, Medium Pressure
48LX-1 is an Ultra-thin Precision (UTP) surface microphone for aeroacoustic testing. It is a low-profile ¼″ CCP medium-pressure condenser microphone. The microphone is only 1 mm high and can, therefore, be mounted in air flow without disturbing the sound field.
