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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. We serve diverse application fields including environmental noise monitoring, building acoustics, occupational health and safety, vehicle noise testing, and audiometer calibration. Notably, we design and manufacture our own measurement microphones in-house — from cartridge development to automated performance testing — giving us a critical quality advantage that few competitors can match.
In modern audiology and hearing health diagnostics, accuracy is not simply a metric of quality control; it directly influences patient outcomes. Audiometers—the core diagnostic instruments used to measure hearing thresholds—require precise calibration to ensure that the acoustic and mechanical stimuli delivered to patients match global standards. While air conduction calibration relies heavily on specialized artificial ears and condenser microphones, bone conduction calibration presents a unique set of mechanical challenges. This is where high-precision accelerometer vibration sensors become indispensable.
Bone conduction audiometry bypasses the outer and middle ear, transmitting sound vibrations directly through the skull to the cochlea. To calibrate the bone vibrators (such as the industry-standard Radioear B71 or B81), clinical engineers use an artificial mastoid (mechanical coupler). The central component within this coupler is a high-sensitivity accelerometer vibration sensor. It measures the dynamic force output and vibration patterns generated by the bone conduction transducer, converting physical displacement into precise electrical signals for spectral analysis.
Even a minor drift of 3 to 5 dB in bone conduction calibration can lead to a misdiagnosis of conductive versus sensorineural hearing loss. Such diagnostic errors can result in inappropriate surgical interventions or incorrect hearing aid fittings. High-precision accelerometers ensure that the force levels match Reference Equivalent Threshold Force Levels (RETFL) specified in international standards such as ISO 389-3 and ANSI S3.6.
The global market for audiological diagnostic equipment is experiencing significant expansion, driven by an aging population, rising awareness of occupational noise-induced hearing loss, and expanding neonatal screening programs. Consequently, the demand for audiometer calibration systems has transitioned from centralized calibration laboratories directly to localized hearing clinics, schools, and mobile health units.
Industrially, this transition requires calibration equipment to be not only highly accurate but also rugged, portable, and user-friendly. Manufacturers are increasingly integrating accelerometer sensors with compact digital analyzers, allowing clinical technicians to perform on-site, traceably accurate calibrations without shipping delicate instruments back to factory labs. This shift has significantly reduced operational downtime for hearing clinics worldwide.
To understand the depth of vibration sensor integration in clinical audiology, we must examine their specific roles across different stages of diagnostic testing and calibration:
The primary application of accelerometer vibration sensors in clinics is within artificial mastoids (e.g., conforming to IEC 60318-6). The bone vibrator is placed on the coupler dome under a specified static force. As the vibrator emits test frequencies (typically 250 Hz to 8000 Hz), the internal accelerometer detects the mechanical impedance and force output. The sensor must feature an exceptionally flat frequency response and minimal transverse sensitivity to ensure that lateral movements do not skew the calibration data.
Hearing diagnostic tests must be conducted in environments with ultra-low ambient noise and vibration. External vibrations from traffic, HVAC systems, or footfall can travel through the clinic floor and introduce low-frequency bone-conducted noise to the patient, invalidating the test results. Environmental vibration analyzers equipped with highly sensitive accelerometers are deployed to continuously monitor and log diagnostic cabin conditions, ensuring compliance with ISO 8253-1 standards.
For manufacturers of hearing aids and clinical transducers, vibration sensors are crucial for end-of-line testing. Accelerometers measure the physical casing vibrations of hearing instruments to detect internal component misalignment, dynamic imbalances, or acoustic leakage. This guarantees that every device leaving the production line delivers pure acoustic signals with minimal structural distortion.
For clinical diagnostic testing to be legally and medically valid, calibration instruments must demonstrate strict traceability. Accelerometers must undergo regular calibration using handheld calibrators certified by national metrology institutes. This ensures a unbroken chain of traceability from the clinic's diagnostic audiometer back to international standards, safeguarding patient diagnostic integrity.
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 deep expertise in designing high-sensitivity accelerometers, measurement microphones, and digital signal processing systems has made us a trusted partner for medical institutions, calibration laboratories, and industrial enterprises globally. We continuously bridge the gap between complex physical measurements and practical clinical diagnostics.
Unwavering Dedication
Your Trusted Partner in Acoustic & Vibration Measurement
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, and supports OEM/ODM partnerships.
Our management systems and products hold ISO 14001, ISO 45001, CE, and RoHS certifications, demonstrating our commitment to environmental responsibility, workplace 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 engineers, we deliver responsive, expert support throughout the entire product lifecycle, ensuring our customers always have the assistance they need.
Need precise calibration systems or custom sensor solutions for your hearing clinic? Our engineering team is ready to assist you.
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