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Vibration detector

A technology of detectors and vibration switches, applied in the direction of burglar alarm mechanical start, etc., to reduce false alarms and improve performance

Inactive Publication Date: 2015-07-08
陈奎发
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of high-frequency sampling, the present invention selects the vibration switch as the sensing element

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1, such as figure 2 In the normally open sensing module 10, the resistors R2 and R3 are both short-circuited, and only the resistor R1 and the normally open switch are connected in parallel in the circuit. When a large vibration occurs, the specific resistance of the module changes to a "0" resistor, then The processor can collect corresponding voltage drop signals or high and low level signals. If this circuit is used, multiple sensing modules can be directly connected in series, and figure 1 The structure of the end sensing module 20 shown can be exactly the same as that of the middle sensing module 10 . For this detector, when the switch of any module is closed, the same circuit effect will be produced (change from a specific resistance value to "0" resistance value, and the resistance value of the connecting cable and each welding point is ignored here). For the induction module of this structure, if multiple modules are closed at the same time, the effec...

Embodiment 2

[0019] Example 2, such as figure 2 In the normally open sensing module 10, the resistor R1 is disconnected, and R2 and R3 are 0, that is, only a normally open switch is connected to the positive and negative wires in the circuit. In this way, when the switch of one or more sensing modules of the detector is closed, the resistance value of the circuit changes from infinity to "0". One drawback of this design is that if the cable between the detectors is cut, the detectors fail. Therefore, the terminal sensing module 20 should be adjusted. A simple way is to parallel a resistor on the switch, then the system has three states: short circuit when vibrating, specific resistance value when normal, and open circuit when the cable is cut. Similarly, in this embodiment, it is also impossible to judge which module is giving an alarm, and it is also difficult to judge the situation that multiple modules are giving an alarm at the same time.

[0020] In the above two embodiments, the s...

Embodiment 3

[0021] Example 3, such as figure 2 In the normally open sensing module 10 shown, the resistor R1 is disconnected, and R2 and R3 select specific resistance values, for example, both are 1000 ohms. For a multi-point detector with multiple sensing modules of this structure connected in series, the circuit resistance generated by the action of each module will be significantly different, and the results of multiple sensing modules acting at the same time will also be different, so it can be judged that Which sensors generate action. The terminal sensing module 20 of this embodiment may adopt the same circuit structure as the sensing module 10, or may adopt a different structure, such as optimizing R1, R2, and R3 according to the cable impedance characteristics.

[0022] For Embodiment 3, the signal processor can only make a judgment on the sensing position if it collects the voltage value signal.

[0023] For the sensing module 10 adopting a normally closed switch, the switch i...

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PUM

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Abstract

The invention provides a vibration detector capable of multipoint detection. Vibration switches serve as vibration sensing components, modules internally provided with the vibration switches are connected in series via a cable, and a signal processor carries out sampling and analysis and provides alarm output.

Description

technical field [0001] The invention relates to an anti-theft intrusion alarm in the security field. The product converts a vibration signal into an electrical signal and analyzes it to finally give an alarm signal. The product is mainly used to protect the fence or wall around the building, prevent climbing the fence, cutting the barbed wire, smashing the wall and other illegal damage or intrusion. The product can also be used for anti-theft protection of individual objects such as vehicles. Background technique [0002] In security products, vehicle anti-theft alarms usually use vibration detectors. The sensing elements of these detectors can convert mechanical vibrations into current or voltage signals. According to technical principles, they can be divided into: electromagnetic, capacitive, piezoelectric effect cables or ceramics, and MEMS accelerometers. Since the strength of the obtained electrical signal is directly proportional to the intensity of the vibration, th...

Claims

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Application Information

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IPC IPC(8): G08B13/02
CPCG08B13/02
Inventor 陈奎发
Owner 陈奎发
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