Why it matters now: As autonomous mobile robots proliferate across warehouses, factories, and logistics hubs at a blistering 19.5% CAGR, the safety architecture underpinning these machines has remained stubbornly two-dimensional. Most AMRs still navigate and detect obstacles using planar LiDAR or 2D vision systems — technologies that create dangerous blind spots above and below their scanning planes. The launch of Sonair's ADAR One, the world's first safety-certified 3D ultrasonic sensor, marks a decisive pivot toward volumetric spatial awareness that could reshape how control system engineers approach functional safety in automated environments.
The 3D Safety Imperative: Why 2D Is No Longer Enough
Conventional 2D safety LiDAR sensors project a single horizontal laser plane, detecting objects only within that narrow slice. A forklift tine extending at an angle, a human arm reaching over the scan line, or an overhanging load on a shelf all exist in the sensor's blind spot. These are not edge cases — they are everyday occurrences on busy factory floors.
Sonair's ADAR One uses acoustic detection and ranging technology to generate a continuous 3D awareness field with a four-meter range. The sensor emits ultrasonic pulses and analyses the returning echoes to map the volume of space around a robot, detecting people and obstacles regardless of their height or position relative to traditional scan planes.
Analyst Insight: The shift from 2D to 3D safety sensing mirrors the trajectory we observed in machine vision a decade ago. Just as manufacturers abandoned single-axis cameras for stereo and time-of-flight systems, the industrial safety sector is now crossing the same threshold. Early adopters of volumetric safety sensing will likely gain a compliance advantage as regulatory frameworks evolve to mandate more comprehensive human-detection capabilities.
Inside the ADAR One: Acoustic Detection Reimagined
Unlike optical sensors that struggle with reflective surfaces, transparent materials, dust, and ambient light variance, ultrasonic sensing is inherently robust against common industrial environmental conditions. The ADAR One's compact form factor allows flush mounting into virtually any robot chassis — from warehouse AMRs to emerging humanoid platforms.
Sonair has secured certification qualifying the ADAR One for Safety Integrity Level 2 (SIL 2) under IEC 61508 and Performance Level d (PL d) under ISO 13849. The sensor also fulfills all requirements of the European Machinery Directive, making it deployable across EU-regulated industrial environments without additional conformity assessments for the sensing subsystem.
Understanding the Safety Standards: IEC 61508 & ISO 13849
IEC 61508 is the umbrella functional safety standard governing electronic safety-related systems in high-risk industrial environments. It defines four Safety Integrity Levels (SIL 1–4), with SIL 2 requiring a probability of dangerous failure per hour between 10⁻⁶ and 10⁻⁷. This is the benchmark for applications where a single failure could result in serious injury but not necessarily loss of life.
ISO 13849 applies specifically to safety-related parts of control systems in machinery. It uses Performance Levels (PL a through e), where PL d corresponds to a similar risk-reduction threshold as SIL 2. For PLC and control system engineers, ISO 13849 is the day-to-day standard for designing safety circuits, selecting components, and validating system architectures.
The ADAR One achieving both certifications means it can be integrated as a certified safety component into larger control systems without requiring bespoke validation of the sensor itself — a significant time-to-market advantage.
Built in Rust: A Software-First Safety Proposition
In an industry first, the ADAR One's embedded firmware is written entirely in Rust — a systems programming language with memory-safety guarantees enforced at compile time. This eliminates entire categories of software bugs — buffer overflows, null-pointer dereferences, and data races — that have historically plagued C and C++ based safety controllers.
For industrial automation engineers accustomed to validating software through exhaustive testing, Rust's ownership model offers a complementary strategy: design-time elimination of undefined behaviour. Sonair claims this architectural decision accelerated their certification process by reducing the burden of software-level fault injection testing.
Market Trend: The global AMR market was valued at approximately USD 3.1 billion in 2025 and is projected to reach USD 17 billion by 2035. Within this, the safety controller segment alone is forecast to grow from USD 2.8 billion to USD 5.4 billion by 2034. Sensors capable of achieving SIL 2/PL d certification while reducing integration complexity are positioned to capture disproportionate value as safety regulations tighten across North American and European manufacturing sectors.
What the ADAR One Means for PLC and Control System Integrators
For systems integrators designing safety-rated control architectures, the ADAR One simplifies a traditionally painful workflow. Rather than combining multiple 2D sensors with safety PLCs and custom logic to achieve volumetric awareness, a single ADAR One can deliver a pre-certified 3D safety field that integrates directly into existing safety chains.
The sensor's compact footprint — a fraction of the size of equivalent 3D LiDAR systems — removes spatial constraints that previously prevented comprehensive safety sensing on smaller robot platforms. This is particularly relevant for the growing fleet of compact AMRs operating in shared human-machine spaces in e-commerce fulfilment and light manufacturing.
Frequently Asked Questions
Q: How does ultrasonic 3D sensing compare to 3D LiDAR for safety applications?
Ultrasonic sensing is inherently immune to optical challenges — it works reliably in direct sunlight, complete darkness, rain, dust, and fog. While LiDAR offers higher angular resolution, ultrasonics provide robust detection of transparent objects (glass, acrylic) and operate without moving parts, reducing mechanical failure risk. For safety-rated human detection at ranges up to four metres, ultrasonic technology now offers a certified, cost-competitive alternative.
Q: Can the ADAR One be retrofitted into existing AMR fleets?
Yes. The sensor communicates via standard industrial interfaces and can be integrated into existing safety PLC architectures as a certified safety component. System integrators would need to validate the safety function at the system level, but the sensor itself arrives pre-certified, substantially reducing the integration burden.
Q: What maintenance does an ultrasonic safety sensor require?
Unlike optical sensors that demand regular lens cleaning in dusty or oily environments, ultrasonic transducers are largely self-cleaning through vibration during operation. Periodic functional tests, as mandated by IEC 61508 for any safety component, remain necessary — but the sensor's solid-state design minimises mechanical wear points.
The Road Ahead for Industrial Safety Sensing
Sonair's certification achievement signals a broader industry maturation. Safety is transitioning from a compliance checkbox to a performance differentiator, and sensor technology is evolving accordingly. The ADAR One demonstrates that 3D awareness, once reserved for expensive perception systems, can now be delivered in a safety-certified, production-ready package suitable for volume deployment.
As the AMR installed base crosses from early adoption into mainstream integration — over 38,000 units deployed in Asia-Pacific alone in 2023 — the pressure to deliver robust, certification-ready safety solutions will only intensify. Sensors like the ADAR One suggest that the next generation of industrial safety will be volumetric, software-hardened, and designed for integration from the ground up.
