With accelerating technological advancements, Piezoelectric Micromachined Ultrasonic Transducer (PMUT) are reshaping ultrasonic applications through advantages like miniaturization, low power consumption, and integrability.
However, their core performance parameter—operating frequency—directly determines detection range, resolution, and penetration capability. Therefore, precisely matching frequency to the application scenario is key to maximizing PMUT value.
40KHz
Robust Penetration: Ideal for Short-Range Sensing
Physical Characteristics:
Lower attenuation in common media (e.g., air) with moderate wavelength (~8.8 mm in air).
Typical Applications:
Child Presence Detection (CPD) in smart cabins, service robot navigation/obstacle avoidance (balancing range and environmental adaptability), smart toilet auto-sensing.
Core Advantages:
Short-range ranging/obstacle avoidance: Low attenuation enables reliable meter-level detection in smart cabins, service robots, drones, and smart home devices, balancing range and precision.
Gas/low-density media detection: Relatively high coupling efficiency for low-acoustic-impedance media (e.g., air), suitable for flow meters and presence sensing.
Cost & robustness: High technological maturity, ease of manufacturing/integration, and simplified system design.
65KHz
Industrial Ranging & Environmental Sensing: The Sweet Spot
Physical Characteristics:
Optimal balance between penetration and precision in complex industrial environments (~5.2 mm wavelength in air).
Typical Applications:
Pallet depth detection for unmanned forklifts, anti-collision for aerial work platforms, detection for unmanned cleaning vehicles/access gates, agricultural spray boom height monitoring.
Core Advantages:
Strong anti-interference: Penetrates humid, dusty, or smoky environments (e.g., agricultural spray boom monitoring). Performance unaffected by target color or material (metal/plastic/textile). Avoids false readings from stains, glare, or low light—unlike optical sensors.
Stable mid-range detection: Effectively covers short-range, high-precision industrial needs with real-time response (millisecond-level echo processing). Ideal for dynamic machinery control (e.g., emergency stop for aerial platforms).
Environmental resilience: Withstands temperature fluctuations, supports concealed installation, and offers enhanced dust/water resistance for outdoor heavy machinery.
450KHz
Precision Imaging & NDT: The "Eagle Eye"
Physical Characteristics:
High frequency enables ultra-short wavelength (~3.3 mm in water) and easier acoustic beam focusing.
Typical Applications:
High-precision industrial non-destructive testing (NDT) (electronic component packaging defects, composite delamination), biomedical high-frequency ultrasound microscopy (dermatology, ophthalmology, small animal studies), MEMS structure/defect analysis.
Core Advantages:
Sub-millimeter resolution: Resolves structural defects or tissue micro-changes (e.g., early-stage lesions, micro-cracks) at sub-mm scales, delivering far richer detail than low frequencies.
Micron-level thickness measurement/characterization: Measures thin films/coatings with micron-level precision and analyzes internal microstructure (e.g., porosity, uniformity).
Surface/near-surface defect detection: Energy concentrates near the surface, offering high sensitivity to anomalies like surface cracks or debonding.
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