Ultrasonic sensors are often used to adjust spray volume by allowing the calculation of the crown volume of tree crops. The special conditions of the olive tree require the use of long-range sensors, which are less accurate and faster than the most commonly used sensors. The main objectives of the study were to determine the suitability of the sensor in terms of sound cone determination, angle ...

Ultrasonic oscillating temperature sensors (UOTSs) were shown to respond changes in aqueous solutions faster than conventional temperatures [1]. This study describes a recently developed air UOTS and presents experimental results on its response step recorded simultaneously using AHT20 BMP280 sensors. These demonstrate remarkably fast time.

Ultrasonic sensors are commonly used for a wide variety of non-contact presence, proximity or distance measuring applications in industry, especially the automotive branch. This paper shows how the radiation properties of bending-type ultrasonic transducers with rotational symmetry depend on shape, dimensions and material parameters. In order to determine their dependencies, the behaviour of su...

The search for existing or past life in the Universe is one of the most important objectives of NASA’s mission. In support of this objective, an ultrasonic based mechanism is being developed to allow probing and sampling of rocks and soil. The novel lightweight Ultrasonic/Sonic Driller/Corer (USDC) used in this study takes advantage of its ability to drill with low axial force and low power. Th...

This paper proposes a new method to find an absolute position by using ultrasonic sensors. In order to evaluate the performance of U-SAT (Ultrasonic Satellite system), the autonomous navigation performance of a mobile robot is tested. Experiments were performed in both cases that the mobile robot moves to the target point using relative positioning method in conjunction with U-SAT, which is, ab...

Collision and turnover are fatal to mobile robots. Control methods are suggested for solving the fatal problems of mobile robots maneuvered by an operator. Speed reduction and wall following are applied for collision avoidance using ultrasonic sensor data. Modified Hough transform is suggested to obtain a wall model from sonar data overcoming limitations of ultrasonic sensors. The robot is also...

A cleaning robot based on the ultrasonic principle is designed. With the single chip microcomputer AT89C52 and ultrasonic sensors, the robot can achieve the function of intelligent obstacle avoidance, automatic control and automatic sweeping. In the cleaning robot, a rotating cylindrical brush is used in front of the robot and it sweeps garbages into the dustbin in the process of movement, and ...

In oil and gas and geothermal installations, open channels followed by sieves for removal of drill cuttings, are used to monitor the quality and quantity of the drilling fluids. Drilling fluid flow rate is difficult to measure due to the varying flow conditions (e.g., wavy, turbulent and irregular) and the presence of drilling cuttings and gas bubbles. Inclusion of a Venturi section in the open...

Attached ultrasonic sensors can detect changes caused by crack initiation and growth if the wave path is directed through the area of critical crack formation. Dynamics of cracks opening and closing under load cause nonlinear modulation of received ultrasonic signals, enabling small cracks to be detected by stationary sensors. A methodology is presented based upon the behavior of ultrasonic sig...

In this paper an empirical study about distance measurements with ultrasonic sensors within an intermodal container is presented. In a previous work [1] the Received Signal Strength Indicator (RSSI) was used for measuring the distance between two nodes in a Wireless Sensor Network (WSN). Since RSSI revealed a huge distance measurement error (52 cm) and standard deviation (47 cm) a Time-of-Fligh...