Device for monitoring relative point of impact of an object in flight proximal a reference line on a surface

DETAILED DESCRIPTION A device for monitoring the relative point of impact of an object in flight proximal a reference line on a surface comprising means for forming at least one plane of radiated energy, preferably light beams, the plane being pre-positioned with respect to the reference line.
The device includes means, preferably photodetectors, for detecting relative elevation of the object at two successive points in time based on intersection of at least one plane of radiated energy by the object and for generating data representative of the relative elevations, and means for generating a signal indicative of whether the point of surface impact of the object is on the reference line or is to one side of the reference line or the other based on the data.
Preferably, the means for generating the signal is a programmed microcomputer which commands an audible or visual annunciator.
For the purpose of illustrating the invention, there is shown in the drawings forms which are presently preferred; it being understood, however, that this invention is not limited to the precise arrangements and instrumentalities shown.