Hangzhou Aihua Instruments Co., Ltd. (AIHUA INSTRUMENTS) is proud to announce the official launch of two new infrasound sensors — the AWA14423C-S01C and AWA14523-S01C — engineered to push the boundaries of low-frequency acoustic measurement down to 0.1Hz, a range that conventional audio measurement instruments simply cannot reach.

Why Conventional Acoustic Instruments Fall Short

Standard audio acoustic measurements are typically limited to the audible frequency range of 20Hz to 20kHz. Even Class 1 sound level meters — the highest precision instruments in professional acoustic work — only operate down to 10Hz. In real-world field measurements, however, engineers and researchers frequently encounter infrasound: low-frequency signals below 20Hz generated by industrial machinery, wind turbines, seismic activity, HVAC systems, and environmental sources. These signals can extend as low as 0.1Hz, far beyond the reach of conventional microphones and analyzers. Until now, there has been no reliable, professional-grade solution that bridges both worlds.

Introducing the AWA14423C-S01C and AWA14523-S01C

Dual-Purpose Design: Audio and Infrasound in One Unit

Both new sensor units are built around a free-field infrasound microphone combined with a preamplifier, delivering a seamless dual-purpose measurement capability. They fully satisfy the requirements of a Class 1 sound level meter for standard audio acoustic measurements, while simultaneously extending measurement capability down to 0.1Hz for infrasound applications — eliminating the need to switch between separate instruments in the field.

Each unit is equipped with a LEMO connector output via extension cable, ensuring direct compatibility with mainstream acoustic analyzers, including Brüel & Kjær (B&K) systems. This plug-and-play integration means the AWA14423C-S01C and AWA14523-S01C slots naturally fit into existing measurement workflows without additional adapters or signal conditioning.

In the infrasound range and below 1kHz, pressure field and free-field responses are identical, ensuring measurement accuracy across the full low-frequency spectrum. At higher frequencies, the units account for the pressure increase caused by reflection and diffraction at the microphone diaphragm.

How to Choose Between the Two Models

While both units share similar performance characteristics and measurement architecture, each is optimized for different application priorities:

The AWA14423C-S01C is the preferred choice when capturing weak infrasound signals with maximum sensitivity is the priority. The AWA14523-S01C is ideal for applications requiring an extended upper frequency range up to 40kHz, making it suitable for broadband environmental noise studies and research applications demanding wide-spectrum coverage.

Built to Last: Advanced Materials and Cleanroom Assembly

Second-Generation Alloy Diaphragm Technology

Every infrasound sensor in the AIHUA lineup — including these two new units — is built with a second-generation alloy diaphragm, a high-strength protective grid, and an artificial corundum insulator. Compared to traditional nickel and stainless steel diaphragms, the alloy construction delivers measurably superior performance across four critical dimensions: corrosion resistance, high-temperature stability, impact resistance, and specific strength. This makes them reliable in demanding outdoor, industrial, and research environments where sensor failure is not an option.

Cleanroom-Assembled for Uncompromising Quality

All AIHUA infrasound sensors are assembled and calibrated in a dedicated cleanroom facility, ensuring every unit shipped meets the strictest quality standards. This level of manufacturing discipline directly translates to measurement consistency, long-term stability, and repeatability — qualities that matter in every professional acoustic investigation.

After-Sales Support and Warranty

Both the AWA14423C-S01C and AWA14523-S01C come with a 1-year manufacturer's warranty, backed by Aihua Instrument’s comprehensive after-sales support program. From technical guidance to calibration services, our team is committed to ensuring your instruments perform at their best throughout their working life.

For product specifications, pricing, and availability, contact the Aihua sales team directly: 
https://www.hzaihua.com/service.html#d3