Ranging with Frequency Dependent Ultrasound Air Attenuation
Riccardo Carotenuto1, Fortunato Pezzimenti1, Francesco G Della Corte2,3
1Department of Information Engineering, Infrastructure and Sustainable Energy (DIIES), Mediterranea University of Reggio Calabria, 89124 Reggio Calabria, Italy.
Sensors (Basel, Switzerland)
|August 10, 2021
Summary
This study introduces a novel ultrasonic distance measurement technique using frequency-dependent signal attenuation in air. This method eliminates the need for emitter-receiver synchronization, enabling low-power, compact sensors for various applications.
Area of Science:
- Acoustics and Signal Processing
- Sensor Technology
- Metrology
Background:
- Traditional ultrasonic distance measurement relies on time-of-flight, necessitating precise synchronization between emitters and receivers.
- Synchronization often requires additional hardware and power, limiting applications for low-cost, small, and lightweight sensors.
- Existing methods are unsuitable for scenarios demanding minimal power consumption and device size.
Purpose of the Study:
- To propose an innovative ultrasonic distance measurement technique in air that does not require synchronization.
- To leverage the frequency-dependent attenuation of ultrasonic signals for distance estimation.
- To develop a mathematical model for calculating distance based on signal attenuation characteristics.
Main Methods:
- Utilizing ultrasonic signals propagating through air.
- Measuring the frequency-dependent attenuation of the ultrasonic signal.
- Developing and applying a mathematical relationship to estimate distance from attenuation data.
- Performing online measurement of air attenuation during operation.
- Simulating the technique with varying ultrasonic transducer diameters.
Main Results:
- A novel method for distance measurement using frequency-dependent ultrasonic signal attenuation in air was developed.
- The proposed mathematical relationship accurately estimates distance without requiring synchronization.
- Simulations indicate that range accuracy improves with decreased ultrasonic transducer diameter.
- An error of less than ±2.7 cm (average 1.1 cm) was achieved with a 0.5 mm transducer diameter in a simulated office environment.
Conclusions:
- The proposed technique offers a viable alternative for distance measurement using ultrasonic signals in air.
- Eliminating synchronization requirements enables the development of simpler, lower-power, and more compact sensor systems.
- The frequency-dependent attenuation method demonstrates high accuracy, particularly with smaller transducer diameters, making it suitable for various practical applications.
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