Method and device for measuring the height of the cutting table

Details Method and device for measuring the height of the cutting table Method and device for measuring the height of the cutting table

A - Human Necessities

01

D

A01D 41/14 (2006.01) A01D 34/28 (2006.01) A01D 75/00 (2006.01) G01S 7/527 (2006.01) G01S 15/08 (2006.01) G01S 15/10 (2006.01) G01S 15/88 (2006.01)

Patent

CA 2242520

A method of measuring the height of the cutting table of an agricultural implement relative to a surface of the ground with crops by means of an acoustic transducer (2). The sound signal emitted by the transducer (2) is formed by a pseudonoise signal covering a predetermined frequency band. The sound signal is compared with the reflected signal, and the signals are mutually delayed until the comparison has reached its optimum. The delay represents then a measurement of the distance to the surface of the ground. In this manner only the signals originating from the reflection from the surface of the ground are measured, as it is utilized that these signals must present substantially the same pattern as the emitted signals. In this manner the picking up of even weak signals has been facilitated, whether these signals are weak or not compared to strong interference signals.

Procédé de mesure de la hauteur de la table de coupe d'un outil agricole par rapport à une surface du sol comportant des cultures au moyen d'un capteur acoustique (2). Le signal sonore émis par le capteur (2) est constitué par un signal de pseudo-bruit couvrant une bande de fréquence prédéterminée. Ce signal sonore est comparé au signal réfléchi et ces signaux sont retardés réciproquement jusqu'à ce que la comparaison ait atteint son niveau maximum. Le retard représente alors une mesure de la distance à la surface du sol. De ce fait, seuls les signaux provenant de la réflexion depuis la surface du sol sont mesurés, ces signaux devant présenter sensiblement la même configuration que les signaux émis. Ceci a facilité le captage de signaux faibles ou non, par rapport à des signaux de forte interférence.

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