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Explore our flagship Working Standard (WS) and Laboratory Standard (LS) acoustic microphone cartridges tailored for reference calibration systems and rigorous acoustic metrology compliance.
Ensuring absolute physical precision and repeatability in international acoustic testing, calibration laboratories, and national standard institutes.
In modern industrial metrology, quality control, and scientific acoustics, accurate measurement of sound pressure levels relies on the uncompromising fidelity of the transducer. An Acoustic Microphone For Acoustic Calibration Laboratories And Metrology Standards Compliance serves as the primary gateway translating physical pressure fluctuations into quantifiable electrical signals. Because high-precision acoustic calibrators, sound level meters, noise dosimeters, and audiometers are themselves subjected to legal metrology verification, the reference microphones operating within calibration facilities must exhibit flawless performance, extremely low self-noise, linear amplitude response, and virtually negligible long-term drift.
Calibration laboratories operate at the apex of the measurement pyramid. Whether performing primary calibrations via reciprocity techniques or secondary comparison calibrations using sound calibrators and electrostatic actuators, laboratory engineers require standard microphones manufactured to international reference specifications such as IEC 61094. The stability of these microphones directly determines the measurement uncertainty budget of certified calibration laboratories accredited under ISO/IEC 17025.
Full compliance with International Electrotechnical Commission standards governing Laboratory Standard (LS) and Working Standard (WS) measurement microphone specifications.
Advanced nickel-alloy diaphragm stabilization techniques minimizing sensitivity variations caused by ambient temperature and barometric pressure fluctuations.
Direct calibration traceability to National Metrology Institutes (NMIs) like PTB, NIST, NPL, and NIM for seamless ISO/IEC 17025 audit compliance.
Achieving metrology standards compliance demands a rigorous understanding of sound field dynamics. A standard measurement microphone alters the surrounding sound field due to acoustic diffraction caused by its physical body. Depending on the installation geometry and acoustic environment of the calibration laboratory, standard microphones are optimized for specific sound fields:
Acoustic calibration laboratories utilize precise mathematical models and physical setups to establish microphone sensitivity over wide frequency bands. The choice of reference microphone depends on whether the laboratory conducts primary absolute calibration or secondary comparison testing:
Primary Reciprocity Calibration (IEC 61094-2): The gold standard for National Metrology Institutes (NMIs). Reciprocity involves three reciprocal condenser microphones coupled in air-filled acoustic cavities. By driving one microphone as a transmitter and measuring the voltage output of the recipient microphone, absolute sensitivity is derived from mechanical dimensions, acoustic impedance, and physical constants, eliminating the need for a pre-calibrated sound source.
Secondary Electrostatic Actuator & Comparison Methods (IEC 61094-5 & 6): Secondary reference laboratories often rely on calibrated Working Standard microphones (WS1, WS2, WS3) to calibrate customer devices. Comparison calibration places a reference microphone and a test microphone side-by-side in a controlled acoustic sound field or sound coupler (such as the AWA6163A IEC 60318-3 artificial ear setup). Meanwhile, electrostatic actuators simulate acoustic pressure across high frequencies up to 100 kHz to quickly map pressure response curves.
From national standard institutes to aerospace cleanrooms and automated automotive production line testing.
Providing the foundational standard chain for legal metrology. Working Standard (WS2P / WS1F) condenser microphones serve as reference standards for periodic verification of regional acoustic calibrators.
Supporting pass-by noise measurement, EV powertrain noise isolation, engine bench noise diagnostics, and high-channel acoustic camera arrays requiring uniform microphone sensitivity phase matching.
Ensuring compliance with medical device standards. Integrating 1/2" pressure-field microphones with IEC 60318-3 and IEC 60318-4 ear simulators to verify clinical diagnostic audiometers.
High Sound Pressure Level (SOP) measurement microphones like the AWA14435-S14E capture extreme acoustic transient pulses, rocket launch vibrations, and wind tunnel boundary-layer aerodynamics.
Continuous urban noise monitoring and type approval of Class 1 sound level meters (IEC 61672-1). Standard microphones maintain tight tolerance limits over years of field deployment.
Smartphones, smart speakers, and noise-canceling headphone production lines utilize prepolarized digital measurement microphones (e.g., USB iSV1610) for direct, computer-integrated acoustic QC.
Our product range covers sound level meters, noise dosimeters, calibrators, audiometric calibration systems, microphones and accessories, software products, and acoustic test systems — over 60 varieties in total.
Founded in 1992, Aihua Instruments is a Hangzhou-based manufacturer specializing in precision acoustic testing and vibration measurement instrumentation. With over 30 years of unwavering dedication to the acoustic and vibration field, we have established ourselves as one of China's foremost high-tech enterprises in this domain. From our early days as a pioneering research institute to today's internationally recognized brand, our growth reflects a relentless commitment to technological excellence and customer satisfaction.
Notably, we design and manufacture our own measurement microphones in-house — from cartridge development and diaphragm tensioning to automated acoustic calibration and laser-interferometer performance verification — giving us a critical quality advantage that few global competitors can match.
Unwavering Dedication to Precision Measurement
Your Trusted Global Partner in Acoustic & Vibration Measurement Solutions
Our fully equipped manufacturing facility features advanced automated test systems, ensuring every product meets strict quality benchmarks before leaving the factory.
Identified as a provincial High-tech Enterprise R&D Center, our dedicated engineering team continuously drives innovation in digital detection, signal processing, and remote monitoring technologies.
Our management systems and products hold ISO 14001, ISO 45001, CE, and RoHS certifications, demonstrating our commitment to environmental responsibility and global compliance.
We export to over 40 countries across Europe, North America, South America, and Asia, with a strong reputation built on consistent quality and competitive pricing.
Backed by professional acoustic engineers, we deliver responsive, expert support throughout the entire product lifecycle, supporting OEM and ODM partnerships worldwide.
Complete control over condenser microphone diaphragm tensioning, thermal stabilization, and backplate polarization for unparalleled sensitivity consistency.
BUILT IN CHINA, TRUSTED WORLDWIDE. Partner with us for accredited acoustic calibration standards, precision measurement microphones, and custom acoustic testing solutions.
Explore our comprehensive selection of 1-inch, 1/2-inch, 1/4-inch, and coupler-specific measurement microphones for metrology laboratories.
