Characteristics of a high power ultrasonic array transmitter in air
A high-power ultrasonic array transmitter with 144 transmitting elements for 3D measurements in air has been developed. The sound pressure level of 126 dB was obtained at a distance of 5 m in the air with an ultrasonic frequency of 40 kHz. This value is approximately 32 dB higher than that obtained using a single transmitting element. The characteristics of the array transmitter were studied and compared with simulation results. The experimental results were in good agreement with the simulation results.
Long‐range measurement system using ultrasonic range sensor with high‐power transmitter array in air
HighlightsConcept of portable high power 144 elements ultrasonic transmitter array.Concept of high sensitive 32 elements ultrasonic receiver array.Delay‐and‐sum operations for image sensing and detection of an object.Concept of ranging and three dimensional imaging in adverse conditions. &NA; A long‐range measurement system comprising an ultrasonic range sensor with a high‐power ultrasonic transmitter array in air was investigated. The system is simple in construction and can be used under adverse conditions such as fog, rain, darkness, and smoke. However, due to ultrasonic waves are well absorbed by air molecules, the measurable range is limited to a few meters. Therefore, we developed a high‐power ultrasonic transmitter array consisting of 144 transmitting elements. All elements are arranged in the form of a 12 × 12 array pattern. The sound pressure level at 5 m from the transmitter array was >30 dB higher than that of a single element. A measuring range of over 25 m was achieved using this transmitter array in conjunction with a receiver array having 32 receiving elements. The characteristics of the transmitter array and range sensor system are discussed by comparing simulation and experimental results.
Adaptive Werkstoffsysteme: Der Werkstoff sendet ZFP-Signale
Adaptive composites made from carbon-fibre reinforced plastics with integrated piezoceramics are very attractive for the design of smart structures. Non-destructive evaluation of structural and functional features with acoustic, electromagnetic and thermal methods contributes to the development of the material system and guarantees serviceability. New methods, using the active capabilities of the material system for the generation of signals for non-destructive testing, are of special interest. This way, a contribution to health monitoring strategies is provided.