JPH0247590U - - Google Patents

Info

Publication number
JPH0247590U
JPH0247590U JP12650688U JP12650688U JPH0247590U JP H0247590 U JPH0247590 U JP H0247590U JP 12650688 U JP12650688 U JP 12650688U JP 12650688 U JP12650688 U JP 12650688U JP H0247590 U JPH0247590 U JP H0247590U
Authority
JP
Japan
Prior art keywords
room
output
threshold value
signal
frequency shift
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP12650688U
Other languages
Japanese (ja)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP12650688U priority Critical patent/JPH0247590U/ja
Publication of JPH0247590U publication Critical patent/JPH0247590U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、本発明の一実施例を示すブロツク図
、第２図は、同上の動作説明のための波形図、第
３図は、従来例を示すブロツク図、第４図は、同
上の動作説明のための波形図である。 １…発振器、２…送波器、３…受波器、４…ミ
キサ回路、５…検波回路、６…増幅回路、７…積
分回路、８…閾値回路、９…閾値制御回路。 Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a waveform diagram for explaining the operation of the same as above, Fig. 3 is a block diagram showing a conventional example, and Fig. 4 is a block diagram of the same as above. FIG. 3 is a waveform diagram for explaining the operation. DESCRIPTION OF SYMBOLS 1... Oscillator, 2... Transmitter, 3... Receiver, 4... Mixer circuit, 5... Detection circuit, 6... Amplifier circuit, 7... Integrating circuit, 8... Threshold circuit, 9... Threshold control circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 発振器から出力される送波信号により送波器を
駆動して超音波を室内に送波し、前記室内の物体
からの反射波を受波器により受波し、受波信号の
周波数偏移成分を検出し、検出された周波数偏移
信号を信号処理し、信号処理された信号を予め設
定された所定の閾値と比較して検知出力を送出す
るようにした在室検知センサにおいて、前記閾値
を制御する閾値制御回路を設け、前記検知出力が
出されたときには前記閾値を小さくし、前記検知
出力が出なくなつたときには前記閾値を大きくす
るようにしたことを特徴とする在室監視センサ。 The transmitter is driven by the transmit signal output from the oscillator to transmit ultrasonic waves into the room, and the reflected waves from the objects in the room are received by the receiver, and the frequency shift component of the received signal is detected. In a room occupancy detection sensor that detects a frequency shift signal, processes the detected frequency shift signal, compares the processed signal with a predetermined threshold value, and sends out a detection output. A room occupancy monitoring sensor comprising: a threshold value control circuit for controlling the room; the threshold value is decreased when the detection output is output; and the threshold value is increased when the detection output is no longer output.
JP12650688U 1988-09-27 1988-09-27 Pending JPH0247590U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12650688U JPH0247590U (en) 1988-09-27 1988-09-27

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12650688U JPH0247590U (en) 1988-09-27 1988-09-27

Publications (1)

Publication Number Publication Date
JPH0247590U true JPH0247590U (en) 1990-03-30

Family

ID=31378089

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12650688U Pending JPH0247590U (en) 1988-09-27 1988-09-27

Country Status (1)

Country Link
JP (1) JPH0247590U (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4842187A (en) * 1971-10-08 1973-06-19
JPS59202083A (en) * 1983-04-30 1984-11-15 Nippon Arefu:Kk Ultrasonic alarm apparatus
JPS61246686A (en) * 1985-04-24 1986-11-01 Matsushita Electric Works Ltd Detector for moving object

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4842187A (en) * 1971-10-08 1973-06-19
JPS59202083A (en) * 1983-04-30 1984-11-15 Nippon Arefu:Kk Ultrasonic alarm apparatus
JPS61246686A (en) * 1985-04-24 1986-11-01 Matsushita Electric Works Ltd Detector for moving object

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