PIR sensor signal triggering method and device
A sensor signal and signal triggering technology, which is applied to instruments, alarms, anti-theft alarms, etc., can solve the problems that PIR sensors cannot be applied to outdoor environments, and achieve accurate signal triggering, accurate identification, and high compatibility.
Active Publication Date: 2020-09-22
HANGZHOU HIKVISION DIGITAL TECH
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Therefore, PIR sensors can hardly be used in outdoor environments
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[0042] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0043] Such as figure 1 As shown, the PIR sensor signal triggering method of the embodiment of the present invention includes:
[0044] Step 1, setting the first voltage threshold and the second voltage threshold;
[0045] Step 2. Within the preset time range when the monitoring signal generated by the PIR sensor reaches the first voltage threshold, the number of times the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold reaches the set value times, a trigger signal is generated.
[0046] Among them, the setting of the first voltage threshold and the second voltage threshold ensures that the number of times the human body can alternately reach the first voltage threshold...
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The invention discloses a PIR sensor signal triggering method and device. The PIR sensor signal triggering method comprises the steps that a first voltage threshold value and a second voltage threshold value are set; and generating a trigger signal when the number of times that the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold value and the second voltage threshold value reaches a set number of times within a preset time range from the moment when the monitoring signal generated by the PIR sensor reaches the first voltage threshold value to timing. Wherein the first voltage threshold value and the second voltage threshold value are voltage threshold values of which waveforms generated by a human body for the PIR sensor can reach set times within a preset time range and waveforms generated by other heat sources except the human body for the PIR sensor cannot reach the set times within the preset time range. The characteristic that waveforms generated by heat sources such as a human body and hot air to the PIR sensor are different is utilized, and accurate recognition and signal triggering of the human body waveforms are achieved.
Description
technical field [0001] The invention relates to the field of security technology, in particular to a PIR sensor signal triggering method and device. Background technique [0002] The working principle of the PIR (Passive Infrared Ray, pyroelectric infrared sensor) sensor is to focus the thermal radiation of the human body on the pyroelectric element through the lens, so that the pyroelectric element produces a corresponding level change with the change of the heat radiation. By monitoring the level change, the alarm in the installation environment of the PIR sensor can be realized. For example, when a person enters the PIR sensor monitoring area, the PIR sensor is prompted to generate a level change, and then an alarm is triggered through the level change of the PIR sensor. [0003] However, since the PIR sensor is a component that passively monitors the level change of thermal radiation, when a heat source similar to the thermal radiation of the human body is generated in ...
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IPC IPC(8): G08B13/191G08B29/18
CPCG08B13/191G08B29/185G08B29/18
Inventor 吴肇杰黄海江
Owner HANGZHOU HIKVISION DIGITAL TECH