Title: Supersonic wave Doppler automatic switch
Application Number: 93118142 Application Date: 1993.09.28
Publication Number: 1104391 Publication Date: 1995.06.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03K17/94,H05B39/04
Applicant(s) Name: Miu Zhaohui, Miu Zhaohui Address: 710072
Inventor(s) Name: Miu Zhaohui
Attorney & Agent: LI WENYI
Abstract:
     The invention relates to a kind of ultrasonic Doppler automatic switch. The oscillator generates 40 KHz constant amplitude wave, which is transmitted after being converted into ultrasonic wave by the ultrasonic emitter. The ultrasonic signal is received by the ultrasonic receiver, and is amplified by the high-frequency amplifier, then the low-frequency signal is detected by the detector, and is amplified by the low-frequency amplifier. The amplified low-frequency signal is sent into the comparator, which determines whether the monostable time-delay circuit is triggered or not and whether the switch circuit is conducted. When there is something moving in the monitoring area, the device can detect it, and switch on the electric lamp, after a moment, it turns off automatically.
Time: 9
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