D1.1 - Ultrasound-based Detection of Objects in Grain Fields
- Event
- 22. GMA/ITG-Fachtagung Sensoren und Messsysteme 2024
2024-06-11 - 2024-06-12
Nürnberg - Band
- Vorträge
- Chapter
- D1 - Ultraschallmesstechnik
- Author(s)
- F. Tröndle, B. George, F. Hubert, S. Rupitsch - Albert-Ludwigs-Universität Freiburg (IMTEK),Freiburg
- Pages
- 296 - 299
- DOI
- 10.5162/sensoren2024/D1.1
- ISBN
- 978-3-910600-01-0
- Price
- free
Abstract
Foreign objects in a crop, such as stones, can cause serious damages if they collide with a grain harvester. Machine damages result in downtimes during the tightly scheduled harvesting phase and lead to additional costs. Currently, there are no technical systems that warn an operator in the case of a collision with foreign objects during harvesting. Therefore, this contribution examines ultrasound-based methods for stone detection. Since ultrasonic sensors are very robust and reliable, these transducers are very common in the agricultural sector. The propagation of acoustic waves within a grain field was examined using a realistic replication. The evaluation criteria during the experiments were the attenuation of the acoustic signal by the crop, the influence of the soil and the arrangement of the ultrasonic sensors. We used mono-frequency, sinusoidal burst sequences with a frequency of 50 kHz and a duty cycle of 0.01 % as acoustic stimulation signals. A synthetic aperture focusing technique was applied to improve the lateral resolution. A vertical alignment of the ultrasonic transducers produced the best possible object resolution.