- Home
- About Us
- Products
- Application
- Resource
- News
- Contact Us
Leave Your Message
Our core industrial line integrates high-precision acoustic imagers, digital sound level meters, precision measurement microphones, and primary calibrators designed for real-time machinery NVH diagnostic workflows.
Precision acoustic & transducer field reference calibrator ensuring IEC 60942 Class 1 compliance across rigorous industrial testing environments.
High-definition acoustic camera combining microphone array signal processing with optical overlay for rapid mechanical noise localization.
Advanced digital signal processing sound analyzer equipped with real-time 1/1 and 1/3 octave filtering and industrial logging modules.
Prepolarized 1/4" free-field wideband measurement microphone engineered for high-frequency acoustic emission and harshness quantification.
Noise, Vibration, and Harshness (NVH) testing has shifted from an end-of-line quality checkpoint to an essential core competency driving asset longevity, mechanical efficiency, and acoustic comfort across global industries.
Rotating equipment exhibits characteristic vibrational harmonics. Utilizing FFT spectral decomposition and order tracking, engineers isolate unbalance, gear mesh faults, bearing spalling, and hydrodynamic turbulence before catastrophic failure occurs.
Structural vibration directly drives acoustic radiation. Advanced NVH equipment bridges the mechanical transfer function (FRF) between structural excitation and radiated airborne noise, enabling targeted acoustic dampening and modal tuning.
Transitioning from calendar-based maintenance to condition-based reliability models reduces plant downtime by up to 45%. Real-time root-mean-square (RMS), peak velocity, and crest factor metrics provide actionable machine health indices.
From micro-amplitude transducer calibration to heavy industrial multi-axis powertrain diagnostics, our instrumentation delivers repeatable precision under rigorous operating environments.
With the elimination of internal combustion engine masking noise, high-frequency electromagnetic whining (1 kHz – 16 kHz) and inverter ripple effects become dominant. Our 1/4" and 1/2" wideband measurement microphones and FFT vibration analyzers capture ultra-low noise thresholds and micro-vibrations across stator windings, planetary gear sets, and high-speed bearings running up to 20,000 RPM.
Large-scale power plants, chemical refineries, and water distribution facilities rely on continuous vibration monitoring to detect cavitation, shaft misalignment, critical speed resonance, and oil whip. Implementing ISO 10816 / ISO 20816 standards, our dual-level vibration calibrators and multi-channel sound and vibration meters safeguard multimillion-dollar assets against catastrophic mechanical seizure.
Sub-micron machining and wafer fabrication tolerate virtually zero background vibration. Our Class 1 prepolarized low-noise measurement microphones and high-sensitivity FFT analyzers measure ambient floor micro-tremors and spindle dynamic balance, validating VC (Vibration Criteria) curves essential for nanometer-level yield optimization.
Compliance with occupational health regulations and environmental noise directives requires accurate sound power determination (ISO 3744/3745/3746). Combining precision acoustic imagers with calibrated free-field microphones empowers acoustics engineers to map localized noise leakage in machinery casings, soundproof barriers, and heavy diesel generator enclosures.
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. Our comprehensive 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.
Your Trusted Partner in Acoustic & Vibration Measurement Instrumentation
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 engineering team continuously drives innovation in digital detection, signal processing, and remote monitoring.
Our management systems and products hold ISO 14001, ISO 45001, CE, and RoHS certifications, demonstrating commitment to environmental safety 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 metrology engineers, we deliver responsive, expert support throughout the entire product lifecycle, ensuring uninterrupted test bench uptime.
Explore our full line of measurement microphones, vibration calibrators, and FFT analyzers tailored for industrial NVH and machinery health monitoring.
Ultra-wide frequency response for ultrasonic component analysis and high-speed turbomachinery noise measurement.
View Product Details →
Portable handheld vibration source delivering precise 10 m/s² and 20 m/s² reference calibration for accelerometers.
View Product Details →
Extreme sensitivity and ultra-low internal noise floor for anechoic chamber acoustic testing and quiet machinery benchmarks.
View Product Details →
Engineered for high-intensity acoustic environments, exhaust blast characterization, and internal duct pressure testing.
View Product Details →
Dual-purpose acoustic and vibration analyzer offering real-time 1/1 & 1/3 octave band analysis and FFT processing.
View Product Details →
Optimized for coupler calibrations, acoustic impedance tubes, and flush-mounted boundary layer wall pressure measurements.
View Product Details →
Compact form factor minimizing high-frequency sound field disturbance, ideal for tight machinery spatial testing.
View Product Details →
Rugged field diagnostics workstation with integrated time waveform, auto-spectrum, bearing condition index, and balance modes.
View Product Details →Key technical insights regarding sensor selection, international measurement standards, and diagnostic methodology for machinery condition monitoring.
A free-field microphone is aerodynamically tuned to compensate for the acoustic disturbance caused by its own presence in an open, non-reflective sound field, ensuring a flat frequency response at 0-degree incidence. In contrast, a pressure-field microphone is designed to measure the actual acoustic pressure at the diaphragm surface, making it the ideal choice for flush-mounted duct measurements, acoustic couplers, cavities, and impedance tube testing.
Field calibration with an instrument such as the AWA6071A verifies the end-to-end sensitivity of the measurement chain — including the accelerometer, cabling, preamplifiers, and FFT analyzer. Performing dual-level verification (e.g., 10 m/s² and 20 m/s² RMS) confirms system linearity and eliminates gain drift caused by thermal gradients or mechanical shock, ensuring traceable data conforming to ISO 16063 standards.
Rolling element bearings generate distinct defect frequencies based on internal geometry: BPFI (Ball Pass Frequency Inner Ring), BPFO (Ball Pass Frequency Outer Ring), BSF (Ball Spin Frequency), and FTF (Fundamental Train Frequency). Portable FFT analyzers like the YT3002 isolate these high-frequency impulse signatures from background rotational noise using envelope demodulation, identifying early subsurface spalling weeks before physical breakdown.
The primary international framework is ISO 20816 (superseding ISO 10816 and ISO 7919). It establishes criteria for evaluating vibration magnitude measured on non-rotating and rotating parts across machine classes (pumps, compressors, steam turbines, electric motors), classifying machine condition from Zone A (newly commissioned) to Zone D (unacceptable vibration requiring immediate shutdown).
