---
title: "The ACU-RES® Difference: A New Standard in Wind Measurement"
description: For nearly 25 years, FT Technologies has been a go-to provider of wind sensors for turbine OEMs and retrofits. What differentiates the companys products in a competitive market is its proprietary Acoustic Resonance (ACU-RES®) technology. This measurement method differs significantly from the Time-of-Flight (ToF) principle used in other ultrasonic wind sensors.
---

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# [The ACU-RES® Difference: A New Standard in Wind Measurement](https://pes.eu.com/digital-blog/the-acu-res-difference-a-new-standard-in-wind-measurement)

 Written by [Negin Hashemi](https://pes.eu.com/digital-blog/author/negin-hashemi) | Jan 31, 2026 9:22:35 AM

For nearly 25 years, FT Technologies has been a go-to provider of wind sensors for turbine OEMs and retrofits. What differentiates the companys products in a competitive market is its proprietary Acoustic Resonance (ACU-RES®) technology. This measurement method differs significantly from the Time-of-Flight (ToF) principle used in other ultrasonic wind sensors.

While the ToF principle measures the transit time of ultrasonic pulses sent between transducers , ACU-RES® technology operates within a resonant cavity where sound waves oscillate. As wind passes through this cavity, the sensor measures the phase shift of the standing waves to determine airflow characteristics.

A critical advantage of this method is a superior Signal-to-Noise Ratio (SNR). The resonant cavity amplifies the usable signal while significantly reducing interference from external acoustic noise. A high SNR ensures clear, accurate, and stable measurements, whereas a low SNR can lead to noisy data and dropouts, especially during storms.

### **Engineered for the Harshest Environments**

Recognizing that offshore wind installations are some of the toughest environments for any sensor, FT Technologies has focused on maximizing performance and longevity.

- **Robust Design: **The sensors feature a comprehensive Environmental Protection System (EPS), which includes heaters, high ingress protection, a hard-anodised aluminum body, and EMC protection.
- **Extreme Conditions: **The latest FT7 series is designed to operate without periodic maintenance in regions prone to typhoons, hurricanes, or icy conditions, measuring wind speeds of up to 90 m/s (201 mph).
- **Rigorous Testing: **The sensors have passed over 30 independent external tests and certifications. Every sensor is calibrated in-house using a bespoke wind tunnel, with calibrations routinely verified in a MEASNET-accredited facility.

### **Meeting the Demands of Offshore and Floating Wind**

For remote offshore projects, where maintenance is a significant challenge, a component with an extremely low failure rate is essential to keep turbines operational. The ACU-RES® technology is particularly well-suited for the dynamic conditions of floating offshore wind, which creates motion-induced turbulence. The acoustic cavity is designed to behave predictably even with inclined airflow, a performance characteristic verified at a MEASNET-accredited wind tunnel.

### **Sustainability in Design and Practice**

Sustainability is a core principle for the company, reflected in both its manufacturing processes and product design.

- FT Technologies embraces lean manufacturing principles to reduce material waste.
- The sensors are ultra-compact and lightweight; the average FT742-FF sensor weighs only 320g and is 16cm long, minimizing material use and lowering CO2 emissions from shipping.
- The low-powered design still allows for highly effective heating for anti-icing performance, creating savings for customers and environmental gains.
- The long-lasting, durable construction reduces the need for frequent replacements, thus decreasing e-waste.

### **Powering the Future of Wind Analytics**

As AI and machine learning become central to wind farm optimization, the quality of input data is more crucial than ever. FT Technologies sensors are built to provide the accurate, reliable, real-time data that these predictive models depend on. The sensors are designed for seamless integration into SCADA systems, offering both digital RS485 and analogue 4-20 mA interfaces. Features like Advanced Sensor Diagnostics support AI-driven systems in tasks such as power curve monitoring and proactive maintenance, helping to reduce turbine downtime.

While predominantly known for wind turbine control, the robustness of ACU-RES® technology has led to its adoption in a myriad of other demanding sectors, including maritime navigation, aviation, unmanned systems, and scientific research.

Learn more: [https://fttechnologies.com/](https://fttechnologies.com/)

[View full post](https://pes.eu.com/digital-blog/the-acu-res-difference-a-new-standard-in-wind-measurement)

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