| 摘要 |
PURPOSE: An accuracy measuring system for a target plate and a measuring method thereof are provided to sense when secondary impact materials, such as soil or stone, hit a target plate when a bullet misses the target plate. CONSTITUTION: An accuracy measuring system for a target plate comprises a vibration sensor(100), an ultrasonic sensor(200), and a control part(300). The vibration sensor senses the vibrating of the target plate. The ultrasonic sensor senses an impact wave generated when a bullet travels near the target board. The control part receives a signal from the vibration sensor and the ultrasonic sensor and determines the accuracy of a bullet. The control part comprises a first detection unit(310), a second detection unit(320), an operation unit(330), and a judging unit(340). The first and second detection units receive signals from the vibration sensor and the ultrasonic sensor. The operation unit calculates the signal input time difference between the first and second detection units. The judging unit determines the accuracy of a bullet by comparing the calculated signal input time difference with a set time difference.
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