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Ultrasonic Doppler alarm

An ultrasonic and alarm technology, applied in the field of ultrasonic Doppler alarms, can solve the problems that moving targets cannot be effectively alarmed and the alarm range is small, and achieve the effects of strong anti-interference ability, low cost and good stability

Inactive Publication Date: 2015-07-22
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The ultrasonic alarms in the prior art have a small alarm range, especially for moving targets, which cannot be effectively alarmed.

Method used

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  • Ultrasonic Doppler alarm

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Embodiment Construction

[0009] See attached figure 1 , the present invention consists of an ultrasonic frequency stabilization oscillation driving sending module 1, an ultrasonic acoustic-electric conversion receiving and amplifying module 2, a difference frequency signal detection module 3, an amplifying module 4, a rectifying module 5, a comparing module 6 and a radio frequency output alarm module 7 sequentially connected in series . The ultrasonic frequency stabilization oscillation drive transmission circuit 1 is composed of an ultrasonic transmitter T40-16 and two low-frequency low-power triodes 2SC9013, and the triode Q 1 and Q 2 It constitutes a two-stage common-emitter amplifier circuit, and the ultrasonic transmitter T40-16 is connected between the base and the collector of the common-emitter amplifier circuit to form a frequency-stabilized oscillator circuit, so that the ultrasonic transmitter has a positive feedback effect and emits 40KHz to the space. the ultrasonic signal. The ultraso...

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Abstract

The invention discloses an ultrasonic Doppler alarm. The ultrasonic Doppler alarm is characterized by comprising an ultrasonic transmission module, an acoustic-electric conversion, receiving and amplification module, a detection module, an amplification module, a rectification module, a comparison module and an alarm module which are sequentially serially connected with one another; 40KHz ultrasonic waves are outputted by the ultrasonic transmission module; reflected 40KHz ultrasonic signals are received and then amplified by the acoustic-electric conversion, receiving and amplification module; offset frequency signals are filtered by the detection module; detected movement signals are inputted into the alarm module by the comparison module; the alarm module comprises a trigger and a wireless transmission circuit, audible and visual alarm effects can be realized by the trigger after the trigger is triggered by the inputted movement signals, and remote alarm effects can be realized by the wireless transmission circuit. Compared with the prior art, the ultrasonic Doppler alarm has the advantages that movable objects can be monitored in real time, the ultrasonic Doppler alarm is low in cost, high in sensitivity and interference resistance, long in detection distance and good in stability, alarm signals can be wirelessly transmitted to administrators, accordingly, the remote alarm effects can be realized, and the like.

Description

technical field [0001] The invention relates to the technical field of electronic monitoring, in particular to an ultrasonic Doppler alarm. Background technique [0002] Ultrasonic technology is a high-tech developed in the 20th century. Ultrasonic has the characteristics of high frequency (above 20KHz), small diffraction, good directionality and strong penetrating power, which has attracted widespread attention of scientific and technological workers. When the ultrasonic wave meets an obstacle, it will be reflected to form a reflected wave. If it encounters a moving object, it can also produce a Doppler effect, which opens up a new field for the research of the alarm, and has developed a variety of alarms with different uses and functions. device. [0003] At present, pyroelectric infrared alarms, gas alarms and smoke alarms are widely used in the market. The infrared penetration of infrared alarms is poor, so that the infrared radiation of the human body is easily blocked...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B13/16G01S15/52
CPCG08B13/1627
Inventor 郎权明张冰郭方敏
Owner EAST CHINA NORMAL UNIV
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