Determining Field of View of Ultrasonic Transducer

Determining Field of View of Ultrasonic Transducer -...

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Determining Field of View of Ultrasonic Transducer The field of view of an ultrasonic sensor shows the maximum distance and object can be away from the sensor, at different angles, and still be detected. In other words, if a sensor is pointing in one direction and object is a degrees off of the direct line of sight of the sensor, what is the maximum distance the object can be away from the sensor at the a degrees and still be detected? To determine this measurement, the ultrasonic sensor was set in a fixed position, centered over a protractor. At first, the field of view was tested for a 10” x 10” square of cardboard, and then for a 2” circular can. To start, the object was placed directly in front of the sensor, the 90º position on the protractor, using a string. The object was moved as far back as possible to attain the maximum displacement the sensor could detect. Afterwards, the angular displacement a of the object was changed by 10º. The string was pulled taught and the maximum displacement was measured again. This process was repeated for all increments of 10º about the center of the sensor. Figure 1 shows the set-up for the experiment and Graph 1 plots the response curves for both the flat object and the circular object. Based on the response curve of the polar graph, the flat object is more detectable by the ultrasonic sensor. This could be attributed to either the size of the object (the flat object is 5 times wider than the circular object) or because the flat object is better at reflecting the ultrasonic frequencies back towards the sensor whereas the circular object deflects more of the frequencies
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This note was uploaded on 10/07/2011 for the course ENGR 102 taught by Professor Primerano during the Winter '10 term at Drexel.

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Determining Field of View of Ultrasonic Transducer -...

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