PROBLEM TO BE SOLVED: To provide an intrusion detection device in such a manner that suppresses false detection caused due to mobile objects other than a person while enabling detection even when a suspicious person intrudes into a car a little later after window glass destruction.SOLUTION: The intrusion detection device comprises a transmission unit 1 which transmits an ultrasonic wave at a predetermined frequency into a car when a transmission signal at a predetermined frequency is inputted to the unit, a receiving unit 2 which receives the ultrasonic wave propagating into the car and converts it into an electrical signal, a mixing unit 4 which mixes the electrical signal output from the receiving unit 2 and an oscillation signal, and a determination unit 6 which determines the presence or absence of a person in the car based on a Doppler signal output from the mixing unit 4. The determination unit 6 performs switching from a basic sensitivity mode for setting the sensitivity of the receiving unit 2 to be lower so as to narrow a detection area when the signal level of the Doppler signal exceeds a predetermined threshold level to a high sensitivity mode for setting the sensitivity of the receiving unit 2 to be higher so as to widen the detection area.SELECTED DRAWING: Figure 1
【課題】人以外の移動物体による誤検知を抑制しつつ、不審者が窓ガラス破壊後時間をおいてから車内に侵入した場合にも検知できるような侵入検知装置を提供することを目的とする。【解決手段】本発明の構成は、所定周波数の発信信号が入力されると所定周波数の超音波を車内に送波する送信部1と、車内に伝播する超音波を受波して電気信号に変換する受信部2と、受信部2から出力される電気信号と発振信号を混合する混合部4と、混合部4から出力されるドップラ信号に基づいて車内の人の存否を判定する判定部6と、を備え、判定部6は、ドップラ信号の信号レベルが所定の閾値を超えると検知領域が狭くなるように受信部2の感度を小さく設定する基本感度モードから、検知領域が広くなるように受信部2の感度を大きく設定する高感度モードに切り替えることを特徴とする侵入検知装置である。【選択図】図1
INTRUSION DETECTION DEVICE
侵入検知装置
2018-06-14
Patent
Electronic Resource
Japanese