Ski speedometer
First Claim
1. A speedometer for a ski supported over and moving along a stationary medium comprising transducer means mounted for movement with the ski for transmitting waves toward the stationary medium and for detecting such waves reflected from the stationary medium, means for measuring the difference in frequency between the transmitted and reflected waves in accordance with the Doppler effect, and means for calculating and indicating the speed of the ski from such frequency difference.
3 Assignments
0 Petitions
Accused Products
Abstract
A transducer is mounted on a ski and transmits ultrasonic waves toward the stationary medium over which the ski is moving. The same transducer or a separate transducer detects waves reflected from the stationary medium. A computer calculates the speed of the ski from the Doppler shift of the reflected waves and actuates a readout unit to indicate the speed to the skier.
118 Citations
8 Claims
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1. A speedometer for a ski supported over and moving along a stationary medium comprising transducer means mounted for movement with the ski for transmitting waves toward the stationary medium and for detecting such waves reflected from the stationary medium, means for measuring the difference in frequency between the transmitted and reflected waves in accordance with the Doppler effect, and means for calculating and indicating the speed of the ski from such frequency difference.
- 2. A speedometer for a ski supported on a stationary medium comprising a first transducer mounted stationarily on the ski for transmitting waves downward to the medium, a second transducer mounted stationarily on the ski for detecting transmitted waves reflected from the supporting medium, means for calculating the speed of the ski relative to the supporting medium in accordance with the Doppler effect, and means for indicating such speed.
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8. A speedometer for a ski supported by a stationary medium, said ski having a cavity therein, comprising transducer means mounted in said cavity for transmitting waves generally downward and for detecting transmitted waves reflected from the supporting medium, means for calculating the speed of the ski relative to the supporting medium in accordance with the Doppler effect, and means for indicating such speed.
Specification