다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.NTIS 바로가기
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.DataON 바로가기
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.Edison 바로가기
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.Kafe 바로가기
|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||340/426 ; 340/435 ; 340/436 ; 340/541|
|발명자 / 주소|
|인용정보||피인용 횟수 : 16 인용 특허 : 27|
An alarm system monitors a region, and includes a transducer supported to aim toward a boundary of the region. The transducer transmits sonic waves and receives echoes. The system generates an initial value corresponding to the distance between the transducer and a boundary of the region at one time, and activates the transducer at a later time to generate a current value corresponding to the distance between the transducer and a location from which the echoes originate. A control compares the current value to the initial value and activates an alarm whe...
An alarm system for detecting movement of a vehicle upwardly from a surface supporting said vehicle, said alarm system comprising: transducer means, facing downwardly toward said surface, for transmitting a sonic wave toward and receiving an echo from said surface; an alarm; electronic means for activating said transducer means to transmit a sonic wave and receive an echo and thereby determine a parameter indicative of a reference distance from said transducer means to said support surface; and means for periodically activating said transducer means and ...