Ten Cate Thiolon B.v.

Wynand Witbreuk

Marinus Hendrikus Olde Weghuis

Geurt Bastiaan Slootweg

Edward Hage

The present invention relates to a method for determining the values of stiffness and dampening, in particular of surfaces for sports fields. The invention furthermore relates to a device for carrying out the aforesaid method. The object of the present invention is to provide a method and a device for determining the values of stiffness and dampening of an artificial grass lawn which provide a reliable measuring result in a quick and efficient manner, which device is furthermore user-friendly and easy to transport. In order to accomplish the aforesaid objective, the method according to the invention is characterized in that a block is placed on the surface in question, which block is struck by means of an electrically controlled excitator at an adjustable frequency interval, at a force which is sensed as a first signal by a force sensor, after which the acceleration of the block is determined as a second signal by means of an acceleration sensor, after which the frequency-dependent transfer function is determined using the aforesaid signals, from which the frequency-dependent stiffness and dampening behaviour of the surface in question is subsequently determined.

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Oldenzaal, Netherlands

Wynand Witbreuk